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Message-ID: <2ab1ca32-ba9a-a069-e4cd-338b4691ce4f@kernel.org>
Date: Fri, 25 Feb 2022 06:54:28 +0100
From: Jiri Slaby <jirislaby@...nel.org>
To: gregkh@...uxfoundation.org
Cc: linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
Richard Genoud <richard.genoud@...il.com>,
Paul Cercueil <paul@...pouillou.net>,
Tobias Klauser <tklauser@...tanz.ch>,
Russell King <linux@...linux.org.uk>,
Vineet Gupta <vgupta@...nel.org>,
Nicolas Ferre <nicolas.ferre@...rochip.com>,
Alexandre Belloni <alexandre.belloni@...tlin.com>,
Ludovic Desroches <ludovic.desroches@...rochip.com>,
Florian Fainelli <f.fainelli@...il.com>,
bcm-kernel-feedback-list@...adcom.com,
Alexander Shiyan <shc_work@...l.ru>,
Baruch Siach <baruch@...s.co.il>,
"Maciej W. Rozycki" <macro@...am.me.uk>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Shawn Guo <shawnguo@...nel.org>,
Sascha Hauer <s.hauer@...gutronix.de>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Fabio Estevam <festevam@...il.com>,
NXP Linux Team <linux-imx@....com>,
Karol Gugala <kgugala@...micro.com>,
Mateusz Holenko <mholenko@...micro.com>,
Vladimir Zapolskiy <vz@...ia.com>,
Neil Armstrong <narmstrong@...libre.com>,
Kevin Hilman <khilman@...libre.com>,
Jerome Brunet <jbrunet@...libre.com>,
Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
Taichi Sugaya <sugaya.taichi@...ionext.com>,
Takao Orito <orito.takao@...ionext.com>,
Liviu Dudau <liviu.dudau@....com>,
Sudeep Holla <sudeep.holla@....com>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
Andreas Färber <afaerber@...e.de>,
Manivannan Sadhasivam <mani@...nel.org>,
Michael Ellerman <mpe@...erman.id.au>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Andy Gross <agross@...nel.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
Orson Zhai <orsonzhai@...il.com>,
Baolin Wang <baolin.wang7@...il.com>,
Chunyan Zhang <zhang.lyra@...il.com>,
Patrice Chotard <patrice.chotard@...s.st.com>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Alexandre Torgue <alexandre.torgue@...s.st.com>,
"David S. Miller" <davem@...emloft.net>,
Peter Korsgaard <peter@...sgaard.com>,
Michal Simek <michal.simek@...inx.com>
Subject: Re: [PATCH v2] serial: make uart_console_write->putchar()'s character
an unsigned char
On 23. 02. 22, 12:33, Jiri Slaby wrote:
> Currently, uart_console_write->putchar's second parameter (the
> character) is of type int. It makes little sense, provided uart_console_write()
> accepts the input string as "const char *s" and passes its content -- the
> characters -- to putchar(). So switch the character's type to unsigned
> char.
>
> We don't use char as that is signed on some platforms. That would cause
> troubles for drivers which (implicitly) cast the char to u16 when
> writing to the device. Sign extension would happen in that case and the
> value written would be completely different to the provided char. DZ is
> an example of such a driver -- on MIPS, it uses u16 for dz_out in
> dz_console_putchar().
>
> Note we do the char -> uchar conversion implicitly in
> uart_console_write(). Provided we do not change size of the data type,
> sign extension does not happen there, so the problem is void.
>
> This makes the types consistent and unified with the rest of the uart
> layer, which uses unsigned char in most places already. One exception is
> xmit_buf, but that is going to be converted later.
And yet, kbuild thinks we need a v3, so please skip this for now:
drivers/tty/serial/sunsab.c:869:45: error: passing argument 4 of
'uart_console_write' from incompatible pointer type
> Signed-off-by: Jiri Slaby <jslaby@...e.cz>
> Acked-by: Richard Genoud <richard.genoud@...il.com> [atmel_serial]
> Cc: Paul Cercueil <paul@...pouillou.net>
> Cc: Tobias Klauser <tklauser@...tanz.ch>
> Cc: Russell King <linux@...linux.org.uk>
> Cc: Vineet Gupta <vgupta@...nel.org>
> Cc: Nicolas Ferre <nicolas.ferre@...rochip.com>
> Cc: Alexandre Belloni <alexandre.belloni@...tlin.com>
> Cc: Ludovic Desroches <ludovic.desroches@...rochip.com>
> Cc: Florian Fainelli <f.fainelli@...il.com>
> Cc: bcm-kernel-feedback-list@...adcom.com
> Cc: Alexander Shiyan <shc_work@...l.ru>
> Cc: Baruch Siach <baruch@...s.co.il>
> Cc: "Maciej W. Rozycki" <macro@...am.me.uk>
> Cc: Paul Walmsley <paul.walmsley@...ive.com>
> Cc: Palmer Dabbelt <palmer@...belt.com>
> Cc: Albert Ou <aou@...s.berkeley.edu>
> Cc: Shawn Guo <shawnguo@...nel.org>
> Cc: Sascha Hauer <s.hauer@...gutronix.de>
> Cc: Pengutronix Kernel Team <kernel@...gutronix.de>
> Cc: Fabio Estevam <festevam@...il.com>
> Cc: NXP Linux Team <linux-imx@....com>
> Cc: Karol Gugala <kgugala@...micro.com>
> Cc: Mateusz Holenko <mholenko@...micro.com>
> Cc: Vladimir Zapolskiy <vz@...ia.com>
> Cc: Neil Armstrong <narmstrong@...libre.com>
> Cc: Kevin Hilman <khilman@...libre.com>
> Cc: Jerome Brunet <jbrunet@...libre.com>
> Cc: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
> Cc: Taichi Sugaya <sugaya.taichi@...ionext.com>
> Cc: Takao Orito <orito.takao@...ionext.com>
> Cc: Liviu Dudau <liviu.dudau@....com>
> Cc: Sudeep Holla <sudeep.holla@....com>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
> Cc: "Andreas Färber" <afaerber@...e.de>
> Cc: Manivannan Sadhasivam <mani@...nel.org>
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Andy Gross <agross@...nel.org>
> Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
> Cc: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
> Cc: Orson Zhai <orsonzhai@...il.com>
> Cc: Baolin Wang <baolin.wang7@...il.com>
> Cc: Chunyan Zhang <zhang.lyra@...il.com>
> Cc: Patrice Chotard <patrice.chotard@...s.st.com>
> Cc: Maxime Coquelin <mcoquelin.stm32@...il.com>
> Cc: Alexandre Torgue <alexandre.torgue@...s.st.com>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Peter Korsgaard <peter@...sgaard.com>
> Cc: Michal Simek <michal.simek@...inx.com>
> ---
> [v2]
> * switch to unsigned (added reasoning to the commit log) -- Maciej
> * fix sprd_serial too
>
> drivers/tty/goldfish.c | 2 +-
> drivers/tty/hvc/hvc_dcc.c | 2 +-
> drivers/tty/serial/21285.c | 2 +-
> drivers/tty/serial/8250/8250_early.c | 2 +-
> drivers/tty/serial/8250/8250_ingenic.c | 2 +-
> drivers/tty/serial/8250/8250_port.c | 2 +-
> drivers/tty/serial/altera_jtaguart.c | 4 ++--
> drivers/tty/serial/altera_uart.c | 2 +-
> drivers/tty/serial/amba-pl010.c | 2 +-
> drivers/tty/serial/amba-pl011.c | 6 +++---
> drivers/tty/serial/apbuart.c | 2 +-
> drivers/tty/serial/ar933x_uart.c | 2 +-
> drivers/tty/serial/arc_uart.c | 2 +-
> drivers/tty/serial/atmel_serial.c | 2 +-
> drivers/tty/serial/bcm63xx_uart.c | 2 +-
> drivers/tty/serial/clps711x.c | 2 +-
> drivers/tty/serial/digicolor-usart.c | 2 +-
> drivers/tty/serial/dz.c | 2 +-
> drivers/tty/serial/earlycon-arm-semihost.c | 2 +-
> drivers/tty/serial/earlycon-riscv-sbi.c | 2 +-
> drivers/tty/serial/fsl_linflexuart.c | 4 ++--
> drivers/tty/serial/fsl_lpuart.c | 4 ++--
> drivers/tty/serial/imx.c | 2 +-
> drivers/tty/serial/imx_earlycon.c | 2 +-
> drivers/tty/serial/ip22zilog.c | 2 +-
> drivers/tty/serial/lantiq.c | 2 +-
> drivers/tty/serial/liteuart.c | 2 +-
> drivers/tty/serial/lpc32xx_hs.c | 2 +-
> drivers/tty/serial/meson_uart.c | 2 +-
> drivers/tty/serial/milbeaut_usio.c | 2 +-
> drivers/tty/serial/mps2-uart.c | 4 ++--
> drivers/tty/serial/mvebu-uart.c | 4 ++--
> drivers/tty/serial/mxs-auart.c | 2 +-
> drivers/tty/serial/omap-serial.c | 4 ++--
> drivers/tty/serial/owl-uart.c | 2 +-
> drivers/tty/serial/pch_uart.c | 2 +-
> drivers/tty/serial/pic32_uart.c | 2 +-
> drivers/tty/serial/pmac_zilog.c | 2 +-
> drivers/tty/serial/pxa.c | 2 +-
> drivers/tty/serial/qcom_geni_serial.c | 2 +-
> drivers/tty/serial/rda-uart.c | 2 +-
> drivers/tty/serial/sa1100.c | 2 +-
> drivers/tty/serial/samsung_tty.c | 4 ++--
> drivers/tty/serial/sb1250-duart.c | 2 +-
> drivers/tty/serial/sccnxp.c | 2 +-
> drivers/tty/serial/serial_core.c | 2 +-
> drivers/tty/serial/serial_txx9.c | 2 +-
> drivers/tty/serial/sh-sci.c | 2 +-
> drivers/tty/serial/sifive.c | 4 ++--
> drivers/tty/serial/sprd_serial.c | 4 ++--
> drivers/tty/serial/st-asc.c | 2 +-
> drivers/tty/serial/stm32-usart.c | 2 +-
> drivers/tty/serial/sunsu.c | 2 +-
> drivers/tty/serial/sunzilog.c | 4 ++--
> drivers/tty/serial/uartlite.c | 4 ++--
> drivers/tty/serial/vr41xx_siu.c | 2 +-
> drivers/tty/serial/vt8500_serial.c | 2 +-
> drivers/tty/serial/xilinx_uartps.c | 2 +-
> drivers/tty/serial/zs.c | 2 +-
> include/linux/serial_core.h | 2 +-
> 60 files changed, 73 insertions(+), 73 deletions(-)
>
> diff --git a/drivers/tty/goldfish.c b/drivers/tty/goldfish.c
> index 5ed19a9857ad..ad13532e92fe 100644
> --- a/drivers/tty/goldfish.c
> +++ b/drivers/tty/goldfish.c
> @@ -434,7 +434,7 @@ static int goldfish_tty_remove(struct platform_device *pdev)
> }
>
> #ifdef CONFIG_GOLDFISH_TTY_EARLY_CONSOLE
> -static void gf_early_console_putchar(struct uart_port *port, int ch)
> +static void gf_early_console_putchar(struct uart_port *port, unsigned char ch)
> {
> __raw_writel(ch, port->membase);
> }
> diff --git a/drivers/tty/hvc/hvc_dcc.c b/drivers/tty/hvc/hvc_dcc.c
> index 8e0edb7d93fd..bd61f9372d83 100644
> --- a/drivers/tty/hvc/hvc_dcc.c
> +++ b/drivers/tty/hvc/hvc_dcc.c
> @@ -15,7 +15,7 @@
> #define DCC_STATUS_RX (1 << 30)
> #define DCC_STATUS_TX (1 << 29)
>
> -static void dcc_uart_console_putchar(struct uart_port *port, int ch)
> +static void dcc_uart_console_putchar(struct uart_port *port, unsigned char ch)
> {
> while (__dcc_getstatus() & DCC_STATUS_TX)
> cpu_relax();
> diff --git a/drivers/tty/serial/21285.c b/drivers/tty/serial/21285.c
> index 09baef4ccc39..7520cc02fd4d 100644
> --- a/drivers/tty/serial/21285.c
> +++ b/drivers/tty/serial/21285.c
> @@ -403,7 +403,7 @@ static void serial21285_setup_ports(void)
> }
>
> #ifdef CONFIG_SERIAL_21285_CONSOLE
> -static void serial21285_console_putchar(struct uart_port *port, int ch)
> +static void serial21285_console_putchar(struct uart_port *port, unsigned char ch)
> {
> while (*CSR_UARTFLG & 0x20)
> barrier();
> diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c
> index c171ce6db691..e52585064565 100644
> --- a/drivers/tty/serial/8250/8250_early.c
> +++ b/drivers/tty/serial/8250/8250_early.c
> @@ -86,7 +86,7 @@ static void serial8250_early_out(struct uart_port *port, int offset, int value)
>
> #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
>
> -static void serial_putc(struct uart_port *port, int c)
> +static void serial_putc(struct uart_port *port, unsigned char c)
> {
> unsigned int status;
>
> diff --git a/drivers/tty/serial/8250/8250_ingenic.c b/drivers/tty/serial/8250/8250_ingenic.c
> index 65402d05eff9..cff91aa03f29 100644
> --- a/drivers/tty/serial/8250/8250_ingenic.c
> +++ b/drivers/tty/serial/8250/8250_ingenic.c
> @@ -52,7 +52,7 @@ static void early_out(struct uart_port *port, int offset, uint8_t value)
> writel(value, port->membase + (offset << 2));
> }
>
> -static void ingenic_early_console_putc(struct uart_port *port, int c)
> +static void ingenic_early_console_putc(struct uart_port *port, unsigned char c)
> {
> uint8_t lsr;
>
> diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
> index 3b12bfc1ed67..6f24eeeb9050 100644
> --- a/drivers/tty/serial/8250/8250_port.c
> +++ b/drivers/tty/serial/8250/8250_port.c
> @@ -3296,7 +3296,7 @@ EXPORT_SYMBOL_GPL(serial8250_set_defaults);
>
> #ifdef CONFIG_SERIAL_8250_CONSOLE
>
> -static void serial8250_console_putchar(struct uart_port *port, int ch)
> +static void serial8250_console_putchar(struct uart_port *port, unsigned char ch)
> {
> struct uart_8250_port *up = up_to_u8250p(port);
>
> diff --git a/drivers/tty/serial/altera_jtaguart.c b/drivers/tty/serial/altera_jtaguart.c
> index 37bffe406b18..1c16345d0a1f 100644
> --- a/drivers/tty/serial/altera_jtaguart.c
> +++ b/drivers/tty/serial/altera_jtaguart.c
> @@ -298,7 +298,7 @@ static struct altera_jtaguart altera_jtaguart_ports[ALTERA_JTAGUART_MAXPORTS];
> #if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE)
>
> #if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE_BYPASS)
> -static void altera_jtaguart_console_putc(struct uart_port *port, int c)
> +static void altera_jtaguart_console_putc(struct uart_port *port, unsigned char c)
> {
> unsigned long status;
> unsigned long flags;
> @@ -318,7 +318,7 @@ static void altera_jtaguart_console_putc(struct uart_port *port, int c)
> spin_unlock_irqrestore(&port->lock, flags);
> }
> #else
> -static void altera_jtaguart_console_putc(struct uart_port *port, int c)
> +static void altera_jtaguart_console_putc(struct uart_port *port, unsigned char c)
> {
> unsigned long flags;
>
> diff --git a/drivers/tty/serial/altera_uart.c b/drivers/tty/serial/altera_uart.c
> index 64a352b40197..8b749ed557c6 100644
> --- a/drivers/tty/serial/altera_uart.c
> +++ b/drivers/tty/serial/altera_uart.c
> @@ -438,7 +438,7 @@ static struct altera_uart altera_uart_ports[CONFIG_SERIAL_ALTERA_UART_MAXPORTS];
>
> #if defined(CONFIG_SERIAL_ALTERA_UART_CONSOLE)
>
> -static void altera_uart_console_putc(struct uart_port *port, int c)
> +static void altera_uart_console_putc(struct uart_port *port, unsigned char c)
> {
> while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
> ALTERA_UART_STATUS_TRDY_MSK))
> diff --git a/drivers/tty/serial/amba-pl010.c b/drivers/tty/serial/amba-pl010.c
> index 47654073123d..896f66cacf8b 100644
> --- a/drivers/tty/serial/amba-pl010.c
> +++ b/drivers/tty/serial/amba-pl010.c
> @@ -556,7 +556,7 @@ static struct uart_amba_port *amba_ports[UART_NR];
>
> #ifdef CONFIG_SERIAL_AMBA_PL010_CONSOLE
>
> -static void pl010_console_putchar(struct uart_port *port, int ch)
> +static void pl010_console_putchar(struct uart_port *port, unsigned char ch)
> {
> struct uart_amba_port *uap =
> container_of(port, struct uart_amba_port, port);
> diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
> index ba053a68529f..51ecb050ae40 100644
> --- a/drivers/tty/serial/amba-pl011.c
> +++ b/drivers/tty/serial/amba-pl011.c
> @@ -2255,7 +2255,7 @@ static struct uart_amba_port *amba_ports[UART_NR];
>
> #ifdef CONFIG_SERIAL_AMBA_PL011_CONSOLE
>
> -static void pl011_console_putchar(struct uart_port *port, int ch)
> +static void pl011_console_putchar(struct uart_port *port, unsigned char ch)
> {
> struct uart_amba_port *uap =
> container_of(port, struct uart_amba_port, port);
> @@ -2471,7 +2471,7 @@ static struct console amba_console = {
>
> #define AMBA_CONSOLE (&amba_console)
>
> -static void qdf2400_e44_putc(struct uart_port *port, int c)
> +static void qdf2400_e44_putc(struct uart_port *port, unsigned char c)
> {
> while (readl(port->membase + UART01x_FR) & UART01x_FR_TXFF)
> cpu_relax();
> @@ -2487,7 +2487,7 @@ static void qdf2400_e44_early_write(struct console *con, const char *s, unsigned
> uart_console_write(&dev->port, s, n, qdf2400_e44_putc);
> }
>
> -static void pl011_putc(struct uart_port *port, int c)
> +static void pl011_putc(struct uart_port *port, unsigned char c)
> {
> while (readl(port->membase + UART01x_FR) & UART01x_FR_TXFF)
> cpu_relax();
> diff --git a/drivers/tty/serial/apbuart.c b/drivers/tty/serial/apbuart.c
> index d8c937bdf3f9..9ef82d870ff2 100644
> --- a/drivers/tty/serial/apbuart.c
> +++ b/drivers/tty/serial/apbuart.c
> @@ -413,7 +413,7 @@ static void apbuart_flush_fifo(struct uart_port *port)
>
> #ifdef CONFIG_SERIAL_GRLIB_GAISLER_APBUART_CONSOLE
>
> -static void apbuart_console_putchar(struct uart_port *port, int ch)
> +static void apbuart_console_putchar(struct uart_port *port, unsigned char ch)
> {
> unsigned int status;
> do {
> diff --git a/drivers/tty/serial/ar933x_uart.c b/drivers/tty/serial/ar933x_uart.c
> index 8cabe50c4a33..6269dbf93546 100644
> --- a/drivers/tty/serial/ar933x_uart.c
> +++ b/drivers/tty/serial/ar933x_uart.c
> @@ -613,7 +613,7 @@ static void ar933x_uart_wait_xmitr(struct ar933x_uart_port *up)
> } while ((status & AR933X_UART_DATA_TX_CSR) == 0);
> }
>
> -static void ar933x_uart_console_putchar(struct uart_port *port, int ch)
> +static void ar933x_uart_console_putchar(struct uart_port *port, unsigned char ch)
> {
> struct ar933x_uart_port *up =
> container_of(port, struct ar933x_uart_port, port);
> diff --git a/drivers/tty/serial/arc_uart.c b/drivers/tty/serial/arc_uart.c
> index 596217d10d5c..2a09e92ef9ed 100644
> --- a/drivers/tty/serial/arc_uart.c
> +++ b/drivers/tty/serial/arc_uart.c
> @@ -508,7 +508,7 @@ static int arc_serial_console_setup(struct console *co, char *options)
> return uart_set_options(port, co, baud, parity, bits, flow);
> }
>
> -static void arc_serial_console_putchar(struct uart_port *port, int ch)
> +static void arc_serial_console_putchar(struct uart_port *port, unsigned char ch)
> {
> while (!(UART_GET_STATUS(port) & TXEMPTY))
> cpu_relax();
> diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
> index 2d09a89974a2..ab79128dbdb5 100644
> --- a/drivers/tty/serial/atmel_serial.c
> +++ b/drivers/tty/serial/atmel_serial.c
> @@ -2541,7 +2541,7 @@ static int atmel_init_port(struct atmel_uart_port *atmel_port,
> }
>
> #ifdef CONFIG_SERIAL_ATMEL_CONSOLE
> -static void atmel_console_putchar(struct uart_port *port, int ch)
> +static void atmel_console_putchar(struct uart_port *port, unsigned char ch)
> {
> while (!(atmel_uart_readl(port, ATMEL_US_CSR) & ATMEL_US_TXRDY))
> cpu_relax();
> diff --git a/drivers/tty/serial/bcm63xx_uart.c b/drivers/tty/serial/bcm63xx_uart.c
> index 6471a54b616b..53b43174aa40 100644
> --- a/drivers/tty/serial/bcm63xx_uart.c
> +++ b/drivers/tty/serial/bcm63xx_uart.c
> @@ -681,7 +681,7 @@ static void wait_for_xmitr(struct uart_port *port)
> /*
> * output given char
> */
> -static void bcm_console_putchar(struct uart_port *port, int ch)
> +static void bcm_console_putchar(struct uart_port *port, unsigned char ch)
> {
> wait_for_xmitr(port);
> bcm_uart_writel(port, ch, UART_FIFO_REG);
> diff --git a/drivers/tty/serial/clps711x.c b/drivers/tty/serial/clps711x.c
> index 95abc6faa3d5..b9b66ad31a08 100644
> --- a/drivers/tty/serial/clps711x.c
> +++ b/drivers/tty/serial/clps711x.c
> @@ -348,7 +348,7 @@ static const struct uart_ops uart_clps711x_ops = {
> };
>
> #ifdef CONFIG_SERIAL_CLPS711X_CONSOLE
> -static void uart_clps711x_console_putchar(struct uart_port *port, int ch)
> +static void uart_clps711x_console_putchar(struct uart_port *port, unsigned char ch)
> {
> struct clps711x_port *s = dev_get_drvdata(port->dev);
> u32 sysflg = 0;
> diff --git a/drivers/tty/serial/digicolor-usart.c b/drivers/tty/serial/digicolor-usart.c
> index 13ac36e2da4f..6d70fea76bb3 100644
> --- a/drivers/tty/serial/digicolor-usart.c
> +++ b/drivers/tty/serial/digicolor-usart.c
> @@ -381,7 +381,7 @@ static const struct uart_ops digicolor_uart_ops = {
> .request_port = digicolor_uart_request_port,
> };
>
> -static void digicolor_uart_console_putchar(struct uart_port *port, int ch)
> +static void digicolor_uart_console_putchar(struct uart_port *port, unsigned char ch)
> {
> while (digicolor_uart_tx_full(port))
> cpu_relax();
> diff --git a/drivers/tty/serial/dz.c b/drivers/tty/serial/dz.c
> index e9edabc5a211..2e21acf39720 100644
> --- a/drivers/tty/serial/dz.c
> +++ b/drivers/tty/serial/dz.c
> @@ -802,7 +802,7 @@ static void __init dz_init_ports(void)
> * restored. Welcome to the world of PDP-11!
> * -------------------------------------------------------------------
> */
> -static void dz_console_putchar(struct uart_port *uport, int ch)
> +static void dz_console_putchar(struct uart_port *uport, unsigned char ch)
> {
> struct dz_port *dport = to_dport(uport);
> unsigned long flags;
> diff --git a/drivers/tty/serial/earlycon-arm-semihost.c b/drivers/tty/serial/earlycon-arm-semihost.c
> index fa096c10b591..fcdec5f42376 100644
> --- a/drivers/tty/serial/earlycon-arm-semihost.c
> +++ b/drivers/tty/serial/earlycon-arm-semihost.c
> @@ -21,7 +21,7 @@
> /*
> * Semihosting-based debug console
> */
> -static void smh_putc(struct uart_port *port, int c)
> +static void smh_putc(struct uart_port *port, unsigned char c)
> {
> #ifdef CONFIG_ARM64
> asm volatile("mov x1, %0\n"
> diff --git a/drivers/tty/serial/earlycon-riscv-sbi.c b/drivers/tty/serial/earlycon-riscv-sbi.c
> index ce81523c3113..27afb0b74ea7 100644
> --- a/drivers/tty/serial/earlycon-riscv-sbi.c
> +++ b/drivers/tty/serial/earlycon-riscv-sbi.c
> @@ -10,7 +10,7 @@
> #include <linux/serial_core.h>
> #include <asm/sbi.h>
>
> -static void sbi_putc(struct uart_port *port, int c)
> +static void sbi_putc(struct uart_port *port, unsigned char c)
> {
> sbi_console_putchar(c);
> }
> diff --git a/drivers/tty/serial/fsl_linflexuart.c b/drivers/tty/serial/fsl_linflexuart.c
> index e72cba085743..98bb0c315e13 100644
> --- a/drivers/tty/serial/fsl_linflexuart.c
> +++ b/drivers/tty/serial/fsl_linflexuart.c
> @@ -553,7 +553,7 @@ static const struct uart_ops linflex_pops = {
> static struct uart_port *linflex_ports[UART_NR];
>
> #ifdef CONFIG_SERIAL_FSL_LINFLEXUART_CONSOLE
> -static void linflex_console_putchar(struct uart_port *port, int ch)
> +static void linflex_console_putchar(struct uart_port *port, unsigned char ch)
> {
> unsigned long cr;
>
> @@ -578,7 +578,7 @@ static void linflex_console_putchar(struct uart_port *port, int ch)
> }
> }
>
> -static void linflex_earlycon_putchar(struct uart_port *port, int ch)
> +static void linflex_earlycon_putchar(struct uart_port *port, unsigned char ch)
> {
> unsigned long flags;
> char *ret;
> diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
> index 7d90c5a530ee..87789872f400 100644
> --- a/drivers/tty/serial/fsl_lpuart.c
> +++ b/drivers/tty/serial/fsl_lpuart.c
> @@ -2333,13 +2333,13 @@ static const struct uart_ops lpuart32_pops = {
> static struct lpuart_port *lpuart_ports[UART_NR];
>
> #ifdef CONFIG_SERIAL_FSL_LPUART_CONSOLE
> -static void lpuart_console_putchar(struct uart_port *port, int ch)
> +static void lpuart_console_putchar(struct uart_port *port, unsigned char ch)
> {
> lpuart_wait_bit_set(port, UARTSR1, UARTSR1_TDRE);
> writeb(ch, port->membase + UARTDR);
> }
>
> -static void lpuart32_console_putchar(struct uart_port *port, int ch)
> +static void lpuart32_console_putchar(struct uart_port *port, unsigned char ch)
> {
> lpuart32_wait_bit_set(port, UARTSTAT, UARTSTAT_TDRE);
> lpuart32_write(port, ch, UARTDATA);
> diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
> index 0b467ce8d737..fd38e6ed4fda 100644
> --- a/drivers/tty/serial/imx.c
> +++ b/drivers/tty/serial/imx.c
> @@ -1968,7 +1968,7 @@ static const struct uart_ops imx_uart_pops = {
> static struct imx_port *imx_uart_ports[UART_NR];
>
> #if IS_ENABLED(CONFIG_SERIAL_IMX_CONSOLE)
> -static void imx_uart_console_putchar(struct uart_port *port, int ch)
> +static void imx_uart_console_putchar(struct uart_port *port, unsigned char ch)
> {
> struct imx_port *sport = (struct imx_port *)port;
>
> diff --git a/drivers/tty/serial/imx_earlycon.c b/drivers/tty/serial/imx_earlycon.c
> index 795606e1a22f..7aab38b2bd8c 100644
> --- a/drivers/tty/serial/imx_earlycon.c
> +++ b/drivers/tty/serial/imx_earlycon.c
> @@ -16,7 +16,7 @@
> #define UTS_TXFULL (1<<4) /* TxFIFO full */
> #define IMX21_UTS 0xb4 /* UART Test Register on all other i.mx*/
>
> -static void imx_uart_console_early_putchar(struct uart_port *port, int ch)
> +static void imx_uart_console_early_putchar(struct uart_port *port, unsigned char ch)
> {
> while (readl_relaxed(port->membase + IMX21_UTS) & UTS_TXFULL)
> cpu_relax();
> diff --git a/drivers/tty/serial/ip22zilog.c b/drivers/tty/serial/ip22zilog.c
> index f4dc5fe4ba92..655e64b26852 100644
> --- a/drivers/tty/serial/ip22zilog.c
> +++ b/drivers/tty/serial/ip22zilog.c
> @@ -990,7 +990,7 @@ static struct zilog_layout * __init get_zs(int chip)
> #define ZS_PUT_CHAR_MAX_DELAY 2000 /* 10 ms */
>
> #ifdef CONFIG_SERIAL_IP22_ZILOG_CONSOLE
> -static void ip22zilog_put_char(struct uart_port *port, int ch)
> +static void ip22zilog_put_char(struct uart_port *port, unsigned char ch)
> {
> struct zilog_channel *channel = ZILOG_CHANNEL_FROM_PORT(port);
> int loops = ZS_PUT_CHAR_MAX_DELAY;
> diff --git a/drivers/tty/serial/lantiq.c b/drivers/tty/serial/lantiq.c
> index 3e324d3f0a6d..a3120c3347dd 100644
> --- a/drivers/tty/serial/lantiq.c
> +++ b/drivers/tty/serial/lantiq.c
> @@ -598,7 +598,7 @@ static const struct uart_ops lqasc_pops = {
>
> #ifdef CONFIG_SERIAL_LANTIQ_CONSOLE
> static void
> -lqasc_console_putchar(struct uart_port *port, int ch)
> +lqasc_console_putchar(struct uart_port *port, unsigned char ch)
> {
> int fifofree;
>
> diff --git a/drivers/tty/serial/liteuart.c b/drivers/tty/serial/liteuart.c
> index 7f74bf7bdcff..328b50521f14 100644
> --- a/drivers/tty/serial/liteuart.c
> +++ b/drivers/tty/serial/liteuart.c
> @@ -93,7 +93,7 @@ static void liteuart_timer(struct timer_list *t)
> mod_timer(&uart->timer, jiffies + uart_poll_timeout(port));
> }
>
> -static void liteuart_putchar(struct uart_port *port, int ch)
> +static void liteuart_putchar(struct uart_port *port, unsigned char ch)
> {
> while (litex_read8(port->membase + OFF_TXFULL))
> cpu_relax();
> diff --git a/drivers/tty/serial/lpc32xx_hs.c b/drivers/tty/serial/lpc32xx_hs.c
> index 07c4161eb4cc..b7b489c68c36 100644
> --- a/drivers/tty/serial/lpc32xx_hs.c
> +++ b/drivers/tty/serial/lpc32xx_hs.c
> @@ -122,7 +122,7 @@ static void wait_for_xmit_ready(struct uart_port *port)
> }
> }
>
> -static void lpc32xx_hsuart_console_putchar(struct uart_port *port, int ch)
> +static void lpc32xx_hsuart_console_putchar(struct uart_port *port, unsigned char ch)
> {
> wait_for_xmit_ready(port);
> writel((u32)ch, LPC32XX_HSUART_FIFO(port->membase));
> diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c
> index 45e00d928253..2bf1c57e0981 100644
> --- a/drivers/tty/serial/meson_uart.c
> +++ b/drivers/tty/serial/meson_uart.c
> @@ -513,7 +513,7 @@ static void meson_uart_enable_tx_engine(struct uart_port *port)
> writel(val, port->membase + AML_UART_CONTROL);
> }
>
> -static void meson_console_putchar(struct uart_port *port, int ch)
> +static void meson_console_putchar(struct uart_port *port, unsigned char ch)
> {
> if (!port->membase)
> return;
> diff --git a/drivers/tty/serial/milbeaut_usio.c b/drivers/tty/serial/milbeaut_usio.c
> index 8f2cab7f66ad..347088bb380e 100644
> --- a/drivers/tty/serial/milbeaut_usio.c
> +++ b/drivers/tty/serial/milbeaut_usio.c
> @@ -400,7 +400,7 @@ static const struct uart_ops mlb_usio_ops = {
>
> #ifdef CONFIG_SERIAL_MILBEAUT_USIO_CONSOLE
>
> -static void mlb_usio_console_putchar(struct uart_port *port, int c)
> +static void mlb_usio_console_putchar(struct uart_port *port, unsigned char c)
> {
> while (!(readb(port->membase + MLB_USIO_REG_SSR) & MLB_USIO_SSR_TDRE))
> cpu_relax();
> diff --git a/drivers/tty/serial/mps2-uart.c b/drivers/tty/serial/mps2-uart.c
> index 587b42f754cb..5e9429dcc51f 100644
> --- a/drivers/tty/serial/mps2-uart.c
> +++ b/drivers/tty/serial/mps2-uart.c
> @@ -432,7 +432,7 @@ static const struct uart_ops mps2_uart_pops = {
> static DEFINE_IDR(ports_idr);
>
> #ifdef CONFIG_SERIAL_MPS2_UART_CONSOLE
> -static void mps2_uart_console_putchar(struct uart_port *port, int ch)
> +static void mps2_uart_console_putchar(struct uart_port *port, unsigned char ch)
> {
> while (mps2_uart_read8(port, UARTn_STATE) & UARTn_STATE_TX_FULL)
> cpu_relax();
> @@ -484,7 +484,7 @@ static struct console mps2_uart_console = {
>
> #define MPS2_SERIAL_CONSOLE (&mps2_uart_console)
>
> -static void mps2_early_putchar(struct uart_port *port, int ch)
> +static void mps2_early_putchar(struct uart_port *port, unsigned char ch)
> {
> while (readb(port->membase + UARTn_STATE) & UARTn_STATE_TX_FULL)
> cpu_relax();
> diff --git a/drivers/tty/serial/mvebu-uart.c b/drivers/tty/serial/mvebu-uart.c
> index ab226da75f7b..b5705da31878 100644
> --- a/drivers/tty/serial/mvebu-uart.c
> +++ b/drivers/tty/serial/mvebu-uart.c
> @@ -598,7 +598,7 @@ static const struct uart_ops mvebu_uart_ops = {
>
> #ifdef CONFIG_SERIAL_MVEBU_CONSOLE
> /* Early Console */
> -static void mvebu_uart_putc(struct uart_port *port, int c)
> +static void mvebu_uart_putc(struct uart_port *port, unsigned char c)
> {
> unsigned int st;
>
> @@ -659,7 +659,7 @@ static void wait_for_xmite(struct uart_port *port)
> (val & STAT_TX_EMP), 1, 10000);
> }
>
> -static void mvebu_uart_console_putchar(struct uart_port *port, int ch)
> +static void mvebu_uart_console_putchar(struct uart_port *port, unsigned char ch)
> {
> wait_for_xmitr(port);
> writel(ch, port->membase + UART_TSH(port));
> diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
> index ac45f3386e97..1944daf8593a 100644
> --- a/drivers/tty/serial/mxs-auart.c
> +++ b/drivers/tty/serial/mxs-auart.c
> @@ -1305,7 +1305,7 @@ static const struct uart_ops mxs_auart_ops = {
> static struct mxs_auart_port *auart_port[MXS_AUART_PORTS];
>
> #ifdef CONFIG_SERIAL_MXS_AUART_CONSOLE
> -static void mxs_auart_console_putchar(struct uart_port *port, int ch)
> +static void mxs_auart_console_putchar(struct uart_port *port, unsigned char ch)
> {
> struct mxs_auart_port *s = to_auart_port(port);
> unsigned int to = 1000;
> diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
> index 0862941862c8..7074670cf81d 100644
> --- a/drivers/tty/serial/omap-serial.c
> +++ b/drivers/tty/serial/omap-serial.c
> @@ -1194,7 +1194,7 @@ static void omap_serial_early_out(struct uart_port *port, int offset,
> writew(value, port->membase + offset);
> }
>
> -static void omap_serial_early_putc(struct uart_port *port, int c)
> +static void omap_serial_early_putc(struct uart_port *port, unsigned char c)
> {
> unsigned int status;
>
> @@ -1238,7 +1238,7 @@ static struct uart_omap_port *serial_omap_console_ports[OMAP_MAX_HSUART_PORTS];
>
> static struct uart_driver serial_omap_reg;
>
> -static void serial_omap_console_putchar(struct uart_port *port, int ch)
> +static void serial_omap_console_putchar(struct uart_port *port, unsigned char ch)
> {
> struct uart_omap_port *up = to_uart_omap_port(port);
>
> diff --git a/drivers/tty/serial/owl-uart.c b/drivers/tty/serial/owl-uart.c
> index 91f1eb0058d7..5250bd7d390a 100644
> --- a/drivers/tty/serial/owl-uart.c
> +++ b/drivers/tty/serial/owl-uart.c
> @@ -516,7 +516,7 @@ static const struct uart_ops owl_uart_ops = {
>
> #ifdef CONFIG_SERIAL_OWL_CONSOLE
>
> -static void owl_console_putchar(struct uart_port *port, int ch)
> +static void owl_console_putchar(struct uart_port *port, unsigned char ch)
> {
> if (!port->membase)
> return;
> diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
> index f0351e6f0ef6..affe71f8b50c 100644
> --- a/drivers/tty/serial/pch_uart.c
> +++ b/drivers/tty/serial/pch_uart.c
> @@ -1600,7 +1600,7 @@ static const struct uart_ops pch_uart_ops = {
>
> #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
>
> -static void pch_console_putchar(struct uart_port *port, int ch)
> +static void pch_console_putchar(struct uart_port *port, unsigned char ch)
> {
> struct eg20t_port *priv =
> container_of(port, struct eg20t_port, port);
> diff --git a/drivers/tty/serial/pic32_uart.c b/drivers/tty/serial/pic32_uart.c
> index 0a12fb11e698..b7a3a1b959b1 100644
> --- a/drivers/tty/serial/pic32_uart.c
> +++ b/drivers/tty/serial/pic32_uart.c
> @@ -691,7 +691,7 @@ static const struct uart_ops pic32_uart_ops = {
>
> #ifdef CONFIG_SERIAL_PIC32_CONSOLE
> /* output given char */
> -static void pic32_console_putchar(struct uart_port *port, int ch)
> +static void pic32_console_putchar(struct uart_port *port, unsigned char ch)
> {
> struct pic32_sport *sport = to_pic32_sport(port);
>
> diff --git a/drivers/tty/serial/pmac_zilog.c b/drivers/tty/serial/pmac_zilog.c
> index 5359236b32d6..5d97c201ad88 100644
> --- a/drivers/tty/serial/pmac_zilog.c
> +++ b/drivers/tty/serial/pmac_zilog.c
> @@ -1944,7 +1944,7 @@ static void __exit exit_pmz(void)
>
> #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
>
> -static void pmz_console_putchar(struct uart_port *port, int ch)
> +static void pmz_console_putchar(struct uart_port *port, unsigned char ch)
> {
> struct uart_pmac_port *uap =
> container_of(port, struct uart_pmac_port, port);
> diff --git a/drivers/tty/serial/pxa.c b/drivers/tty/serial/pxa.c
> index 30b099746a75..5d7b7e56661f 100644
> --- a/drivers/tty/serial/pxa.c
> +++ b/drivers/tty/serial/pxa.c
> @@ -619,7 +619,7 @@ static void wait_for_xmitr(struct uart_pxa_port *up)
> }
> }
>
> -static void serial_pxa_console_putchar(struct uart_port *port, int ch)
> +static void serial_pxa_console_putchar(struct uart_port *port, unsigned char ch)
> {
> struct uart_pxa_port *up = (struct uart_pxa_port *)port;
>
> diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
> index aedc38893e6c..1543a6028856 100644
> --- a/drivers/tty/serial/qcom_geni_serial.c
> +++ b/drivers/tty/serial/qcom_geni_serial.c
> @@ -397,7 +397,7 @@ static void qcom_geni_serial_poll_put_char(struct uart_port *uport,
> #endif
>
> #ifdef CONFIG_SERIAL_QCOM_GENI_CONSOLE
> -static void qcom_geni_serial_wr_char(struct uart_port *uport, int ch)
> +static void qcom_geni_serial_wr_char(struct uart_port *uport, unsigned char ch)
> {
> struct qcom_geni_private_data *private_data = uport->private_data;
>
> diff --git a/drivers/tty/serial/rda-uart.c b/drivers/tty/serial/rda-uart.c
> index d550d8fa2fab..e5f1fded423a 100644
> --- a/drivers/tty/serial/rda-uart.c
> +++ b/drivers/tty/serial/rda-uart.c
> @@ -573,7 +573,7 @@ static const struct uart_ops rda_uart_ops = {
>
> #ifdef CONFIG_SERIAL_RDA_CONSOLE
>
> -static void rda_console_putchar(struct uart_port *port, int ch)
> +static void rda_console_putchar(struct uart_port *port, unsigned char ch)
> {
> if (!port->membase)
> return;
> diff --git a/drivers/tty/serial/sa1100.c b/drivers/tty/serial/sa1100.c
> index 697b6a002a16..5fe6cccfc1ae 100644
> --- a/drivers/tty/serial/sa1100.c
> +++ b/drivers/tty/serial/sa1100.c
> @@ -695,7 +695,7 @@ void __init sa1100_register_uart(int idx, int port)
>
>
> #ifdef CONFIG_SERIAL_SA1100_CONSOLE
> -static void sa1100_console_putchar(struct uart_port *port, int ch)
> +static void sa1100_console_putchar(struct uart_port *port, unsigned char ch)
> {
> struct sa1100_port *sport =
> container_of(port, struct sa1100_port, port);
> diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
> index d002a4e48ed9..2bde7bde7116 100644
> --- a/drivers/tty/serial/samsung_tty.c
> +++ b/drivers/tty/serial/samsung_tty.c
> @@ -2478,7 +2478,7 @@ static void s3c24xx_serial_put_poll_char(struct uart_port *port,
> #endif /* CONFIG_CONSOLE_POLL */
>
> static void
> -s3c24xx_serial_console_putchar(struct uart_port *port, int ch)
> +s3c24xx_serial_console_putchar(struct uart_port *port, unsigned char ch)
> {
> unsigned int ufcon = rd_regl(port, S3C2410_UFCON);
>
> @@ -2965,7 +2965,7 @@ static void samsung_early_busyuart_fifo(struct uart_port *port)
> ;
> }
>
> -static void samsung_early_putc(struct uart_port *port, int c)
> +static void samsung_early_putc(struct uart_port *port, unsigned char c)
> {
> if (readl(port->membase + S3C2410_UFCON) & S3C2410_UFCON_FIFOMODE)
> samsung_early_busyuart_fifo(port);
> diff --git a/drivers/tty/serial/sb1250-duart.c b/drivers/tty/serial/sb1250-duart.c
> index 738df6d9c0d9..2cf8533ef760 100644
> --- a/drivers/tty/serial/sb1250-duart.c
> +++ b/drivers/tty/serial/sb1250-duart.c
> @@ -820,7 +820,7 @@ static void __init sbd_probe_duarts(void)
> * console output. The console_lock is held by the caller, so we
> * shouldn't be interrupted for more console activity.
> */
> -static void sbd_console_putchar(struct uart_port *uport, int ch)
> +static void sbd_console_putchar(struct uart_port *uport, unsigned char ch)
> {
> struct sbd_port *sport = to_sport(uport);
>
> diff --git a/drivers/tty/serial/sccnxp.c b/drivers/tty/serial/sccnxp.c
> index 10cc16a71f26..c56de2e104d4 100644
> --- a/drivers/tty/serial/sccnxp.c
> +++ b/drivers/tty/serial/sccnxp.c
> @@ -828,7 +828,7 @@ static const struct uart_ops sccnxp_ops = {
> };
>
> #ifdef CONFIG_SERIAL_SCCNXP_CONSOLE
> -static void sccnxp_console_putchar(struct uart_port *port, int c)
> +static void sccnxp_console_putchar(struct uart_port *port, unsigned char c)
> {
> int tryes = 100000;
>
> diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
> index 846192a7b4bf..a1688a341411 100644
> --- a/drivers/tty/serial/serial_core.c
> +++ b/drivers/tty/serial/serial_core.c
> @@ -1911,7 +1911,7 @@ static void uart_port_spin_lock_init(struct uart_port *port)
> */
> void uart_console_write(struct uart_port *port, const char *s,
> unsigned int count,
> - void (*putchar)(struct uart_port *, int))
> + void (*putchar)(struct uart_port *, unsigned char))
> {
> unsigned int i;
>
> diff --git a/drivers/tty/serial/serial_txx9.c b/drivers/tty/serial/serial_txx9.c
> index aaca4fe38486..b4d8c2733317 100644
> --- a/drivers/tty/serial/serial_txx9.c
> +++ b/drivers/tty/serial/serial_txx9.c
> @@ -879,7 +879,7 @@ static void __init serial_txx9_register_ports(struct uart_driver *drv,
>
> #ifdef CONFIG_SERIAL_TXX9_CONSOLE
>
> -static void serial_txx9_console_putchar(struct uart_port *port, int ch)
> +static void serial_txx9_console_putchar(struct uart_port *port, unsigned char ch)
> {
> struct uart_txx9_port *up = to_uart_txx9_port(port);
>
> diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
> index b610b27893a8..738093c7b255 100644
> --- a/drivers/tty/serial/sh-sci.c
> +++ b/drivers/tty/serial/sh-sci.c
> @@ -2957,7 +2957,7 @@ static void sci_cleanup_single(struct sci_port *port)
>
> #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) || \
> defined(CONFIG_SERIAL_SH_SCI_EARLYCON)
> -static void serial_console_putchar(struct uart_port *port, int ch)
> +static void serial_console_putchar(struct uart_port *port, unsigned char ch)
> {
> sci_poll_put_char(port, ch);
> }
> diff --git a/drivers/tty/serial/sifive.c b/drivers/tty/serial/sifive.c
> index b79900d0e91a..f5ac14c384c4 100644
> --- a/drivers/tty/serial/sifive.c
> +++ b/drivers/tty/serial/sifive.c
> @@ -756,7 +756,7 @@ static void sifive_serial_poll_put_char(struct uart_port *port,
> */
>
> #ifdef CONFIG_SERIAL_EARLYCON
> -static void early_sifive_serial_putc(struct uart_port *port, int c)
> +static void early_sifive_serial_putc(struct uart_port *port, unsigned char c)
> {
> while (__ssp_early_readl(port, SIFIVE_SERIAL_TXDATA_OFFS) &
> SIFIVE_SERIAL_TXDATA_FULL_MASK)
> @@ -800,7 +800,7 @@ OF_EARLYCON_DECLARE(sifive, "sifive,fu540-c000-uart0",
>
> static struct sifive_serial_port *sifive_serial_console_ports[SIFIVE_SERIAL_MAX_PORTS];
>
> -static void sifive_serial_console_putchar(struct uart_port *port, int ch)
> +static void sifive_serial_console_putchar(struct uart_port *port, unsigned char ch)
> {
> struct sifive_serial_port *ssp = port_to_sifive_serial_port(port);
>
> diff --git a/drivers/tty/serial/sprd_serial.c b/drivers/tty/serial/sprd_serial.c
> index 9a7ae6384edf..4329b9c9cbf0 100644
> --- a/drivers/tty/serial/sprd_serial.c
> +++ b/drivers/tty/serial/sprd_serial.c
> @@ -984,7 +984,7 @@ static void wait_for_xmitr(struct uart_port *port)
> } while (status & SPRD_TX_FIFO_CNT_MASK);
> }
>
> -static void sprd_console_putchar(struct uart_port *port, int ch)
> +static void sprd_console_putchar(struct uart_port *port, unsigned char ch)
> {
> wait_for_xmitr(port);
> serial_out(port, SPRD_TXD, ch);
> @@ -1058,7 +1058,7 @@ console_initcall(sprd_serial_console_init);
> #define SPRD_CONSOLE (&sprd_console)
>
> /* Support for earlycon */
> -static void sprd_putc(struct uart_port *port, int c)
> +static void sprd_putc(struct uart_port *port, unsigned char c)
> {
> unsigned int timeout = SPRD_TIMEOUT;
>
> diff --git a/drivers/tty/serial/st-asc.c b/drivers/tty/serial/st-asc.c
> index 87e480cc8206..d7fd692286cf 100644
> --- a/drivers/tty/serial/st-asc.c
> +++ b/drivers/tty/serial/st-asc.c
> @@ -854,7 +854,7 @@ static int asc_serial_resume(struct device *dev)
> /*----------------------------------------------------------------------*/
>
> #ifdef CONFIG_SERIAL_ST_ASC_CONSOLE
> -static void asc_console_putchar(struct uart_port *port, int ch)
> +static void asc_console_putchar(struct uart_port *port, unsigned char ch)
> {
> unsigned int timeout = 1000000;
>
> diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
> index 1b3a611ac39e..87b5cd4c9743 100644
> --- a/drivers/tty/serial/stm32-usart.c
> +++ b/drivers/tty/serial/stm32-usart.c
> @@ -1641,7 +1641,7 @@ static int stm32_usart_serial_remove(struct platform_device *pdev)
> }
>
> #ifdef CONFIG_SERIAL_STM32_CONSOLE
> -static void stm32_usart_console_putchar(struct uart_port *port, int ch)
> +static void stm32_usart_console_putchar(struct uart_port *port, unsigned char ch)
> {
> struct stm32_port *stm32_port = to_stm32_port(port);
> const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
> diff --git a/drivers/tty/serial/sunsu.c b/drivers/tty/serial/sunsu.c
> index 98b2f4fb9a99..c31389114b86 100644
> --- a/drivers/tty/serial/sunsu.c
> +++ b/drivers/tty/serial/sunsu.c
> @@ -1281,7 +1281,7 @@ static void wait_for_xmitr(struct uart_sunsu_port *up)
> }
> }
>
> -static void sunsu_console_putchar(struct uart_port *port, int ch)
> +static void sunsu_console_putchar(struct uart_port *port, unsigned char ch)
> {
> struct uart_sunsu_port *up =
> container_of(port, struct uart_sunsu_port, port);
> diff --git a/drivers/tty/serial/sunzilog.c b/drivers/tty/serial/sunzilog.c
> index b714b00d2dad..c14275d83b0b 100644
> --- a/drivers/tty/serial/sunzilog.c
> +++ b/drivers/tty/serial/sunzilog.c
> @@ -100,7 +100,7 @@ struct uart_sunzilog_port {
> #endif
> };
>
> -static void sunzilog_putchar(struct uart_port *port, int ch);
> +static void sunzilog_putchar(struct uart_port *port, unsigned char ch);
>
> #define ZILOG_CHANNEL_FROM_PORT(PORT) ((struct zilog_channel __iomem *)((PORT)->membase))
> #define UART_ZILOG(PORT) ((struct uart_sunzilog_port *)(PORT))
> @@ -1125,7 +1125,7 @@ static void sunzilog_free_tables(void)
>
> #define ZS_PUT_CHAR_MAX_DELAY 2000 /* 10 ms */
>
> -static void __maybe_unused sunzilog_putchar(struct uart_port *port, int ch)
> +static void __maybe_unused sunzilog_putchar(struct uart_port *port, unsigned char ch)
> {
> struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
> int loops = ZS_PUT_CHAR_MAX_DELAY;
> diff --git a/drivers/tty/serial/uartlite.c b/drivers/tty/serial/uartlite.c
> index e1fa52d31474..007db67292a2 100644
> --- a/drivers/tty/serial/uartlite.c
> +++ b/drivers/tty/serial/uartlite.c
> @@ -482,7 +482,7 @@ static void ulite_console_wait_tx(struct uart_port *port)
> "timeout waiting for TX buffer empty\n");
> }
>
> -static void ulite_console_putchar(struct uart_port *port, int ch)
> +static void ulite_console_putchar(struct uart_port *port, unsigned char ch)
> {
> ulite_console_wait_tx(port);
> uart_out32(ch, ULITE_TX, port);
> @@ -558,7 +558,7 @@ static struct console ulite_console = {
> .data = &ulite_uart_driver,
> };
>
> -static void early_uartlite_putc(struct uart_port *port, int c)
> +static void early_uartlite_putc(struct uart_port *port, unsigned char c)
> {
> /*
> * Limit how many times we'll spin waiting for TX FIFO status.
> diff --git a/drivers/tty/serial/vr41xx_siu.c b/drivers/tty/serial/vr41xx_siu.c
> index 647198b1e2b9..6b303af5ee54 100644
> --- a/drivers/tty/serial/vr41xx_siu.c
> +++ b/drivers/tty/serial/vr41xx_siu.c
> @@ -743,7 +743,7 @@ static void wait_for_xmitr(struct uart_port *port)
> }
> }
>
> -static void siu_console_putchar(struct uart_port *port, int ch)
> +static void siu_console_putchar(struct uart_port *port, unsigned char ch)
> {
> wait_for_xmitr(port);
> siu_write(port, UART_TX, ch);
> diff --git a/drivers/tty/serial/vt8500_serial.c b/drivers/tty/serial/vt8500_serial.c
> index 9adfe3dc970f..6f08136ce78a 100644
> --- a/drivers/tty/serial/vt8500_serial.c
> +++ b/drivers/tty/serial/vt8500_serial.c
> @@ -484,7 +484,7 @@ static void wait_for_xmitr(struct uart_port *port)
> } while (status & 0x10);
> }
>
> -static void vt8500_console_putchar(struct uart_port *port, int c)
> +static void vt8500_console_putchar(struct uart_port *port, unsigned char c)
> {
> wait_for_xmitr(port);
> writeb(c, port->membase + VT8500_TXFIFO);
> diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
> index d5e243908d9f..250a1d888eeb 100644
> --- a/drivers/tty/serial/xilinx_uartps.c
> +++ b/drivers/tty/serial/xilinx_uartps.c
> @@ -1142,7 +1142,7 @@ static struct uart_driver cdns_uart_uart_driver;
> * @port: Handle to the uart port structure
> * @ch: Character to be written
> */
> -static void cdns_uart_console_putchar(struct uart_port *port, int ch)
> +static void cdns_uart_console_putchar(struct uart_port *port, unsigned char ch)
> {
> while (readl(port->membase + CDNS_UART_SR) & CDNS_UART_SR_TXFULL)
> cpu_relax();
> diff --git a/drivers/tty/serial/zs.c b/drivers/tty/serial/zs.c
> index 4b4f604646a7..70969bf9d82c 100644
> --- a/drivers/tty/serial/zs.c
> +++ b/drivers/tty/serial/zs.c
> @@ -1124,7 +1124,7 @@ static int __init zs_probe_sccs(void)
>
>
> #ifdef CONFIG_SERIAL_ZS_CONSOLE
> -static void zs_console_putchar(struct uart_port *uport, int ch)
> +static void zs_console_putchar(struct uart_port *uport, unsigned char ch)
> {
> struct zs_port *zport = to_zport(uport);
> struct zs_scc *scc = zport->scc;
> diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
> index 31f7fe527395..14ae35f68abb 100644
> --- a/include/linux/serial_core.h
> +++ b/include/linux/serial_core.h
> @@ -399,7 +399,7 @@ int uart_set_options(struct uart_port *port, struct console *co, int baud,
> struct tty_driver *uart_console_device(struct console *co, int *index);
> void uart_console_write(struct uart_port *port, const char *s,
> unsigned int count,
> - void (*putchar)(struct uart_port *, int));
> + void (*putchar)(struct uart_port *, unsigned char));
>
> /*
> * Port/driver registration/removal
--
js
suse labs
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