linux-kernel - Re: [PATCH] tty: hvc: Fix the RISC-V SBI driver for a refactoring

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Message-ID: <mhng-dd8222be-f59f-4422-8cf5-dbefccf63f5f@palmer-ri-x1c9>
Date: Fri, 19 Jan 2024 14:03:41 -0800 (PST)
From: Palmer Dabbelt <palmer@...osinc.com>
To: Palmer Dabbelt <palmer@...osinc.com>
CC: linux-riscv@...ts.infradead.org, Greg KH <gregkh@...uxfoundation.org>,
  jirislaby@...nel.org, Paul Walmsley <paul.walmsley@...ive.com>, aou@...s.berkeley.edu,
  ajones@...tanamicro.com, Atish Patra <atishp@...osinc.com>, apatel@...tanamicro.com,
  linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
  linux-riscv@...ts.infradead.org
Subject:     Re: [PATCH] tty: hvc: Fix the RISC-V SBI driver for a refactoring

On Fri, 19 Jan 2024 13:56:13 PST (-0800), Palmer Dabbelt wrote:
> From: Palmer Dabbelt <palmer@...osinc.com>
>
> I missed the int->size_t refactoring in f32fcbedbe92 ("tty: hvc: convert
> to u8 and size_t"), which causes the newly used ops in 88ead68e764c
> ("tty: Add SBI debug console support to HVC SBI driver") to fail to
> build due to a
>
> linux/drivers/tty/hvc/hvc_riscv_sbi.c:59:15: error: incompatible function pointer types initializing 'ssize_t (*)(uint32_t, const u8 *, size_t)' (aka 'long (*)(unsigned int, const unsigned char *, unsigned long)') with an expression of type 'int (uint32_t, const char *, int)' (aka 'int (unsigned int, const char *, int)') [-Wincompatible-function-pointer-types]
>         .put_chars = hvc_sbi_dbcn_tty_put,
>
> Fixes: f32fcbedbe92 ("tty: hvc: convert to u8 and size_t")
> Fixes: 88ead68e764c ("tty: Add SBI debug console support to HVC SBI driver")
> Signed-off-by: Palmer Dabbelt <palmer@...osinc.com>
> ---
> I now remember Anup pointing this one out, but looks like I forgot about
> it.
> ---
>  drivers/tty/hvc/hvc_riscv_sbi.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/tty/hvc/hvc_riscv_sbi.c b/drivers/tty/hvc/hvc_riscv_sbi.c
> index 2f3571f17ecd..c08718be8e73 100644
> --- a/drivers/tty/hvc/hvc_riscv_sbi.c
> +++ b/drivers/tty/hvc/hvc_riscv_sbi.c
> @@ -15,7 +15,7 @@
>
>  #include "hvc_console.h"
>
> -static int hvc_sbi_tty_put(uint32_t vtermno, const char *buf, int count)
> +static size_t hvc_sbi_tty_put(uint32_t vtermno, const char *buf, int count)

I got a little lost in my branches here, that should be "ssize_t".  I'll 
send a v2 when I figure out why my tester is acting oddly...

>  {
>  	int i;
>
> @@ -25,7 +25,7 @@ static int hvc_sbi_tty_put(uint32_t vtermno, const char *buf, int count)
>  	return i;
>  }
>
> -static int hvc_sbi_tty_get(uint32_t vtermno, char *buf, int count)
> +static size_t hvc_sbi_tty_get(uint32_t vtermno, char *buf, int count)
>  {
>  	int i, c;