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Date: Thu, 3 Mar 2022 09:12:05 +0100
From: Neil Armstrong <narmstrong@...libre.com>
To: Jiri Slaby <jslaby@...e.cz>, gregkh@...uxfoundation.org
Cc: linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
Richard Genoud <richard.genoud@...il.com>,
Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
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>,
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 v4] serial: make uart_console_write->putchar()'s character
an unsigned char
On 03/03/2022 09:08, 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.
>
> Signed-off-by: Jiri Slaby <jslaby@...e.cz>
> Acked-by: Richard Genoud <richard.genoud@...il.com> [atmel_serial]
> Acked-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> 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] make it unsigned
> [v3] fix also sunsab
> [v4] fix also sunplus (added quite recently)
>
> 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/sunplus-uart.c | 5 +++--
> drivers/tty/serial/sunsab.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 +-
> 62 files changed, 77 insertions(+), 76 deletions(-)
>
[...]
> --- a/drivers/tty/serial/meson_uart.c
> +++ b/drivers/tty/serial/meson_uart.c
> @@ -516,7 +516,7 @@ 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;
[...]
Acked-by: Neil Armstrong <narmstrong@...libre.com> # meson_serial
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