linux-kernel - Re: [PATCH v2] tty: hvc: Fix the RISC-V SBI driver for a refactoring

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Date: Sat, 20 Jan 2024 09:29:11 +0530
From: Anup Patel <anup@...infault.org>
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>, 
	Palmer Dabbelt <palmer@...belt.com>, aou@...s.berkeley.edu, ajones@...tanamicro.com, 
	apatel@...tanamicro.com, Atish Patra <atishp@...osinc.com>, 
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org, 
	linux-serial@...r.kernel.org
Subject: Re: [PATCH v2] tty: hvc: Fix the RISC-V SBI driver for a refactoring

On Sat, Jan 20, 2024 at 4:15 AM Palmer Dabbelt <palmer@...osinc.com> 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")
> Link: https://lore.kernel.org/r/20240119215612.20529-2-palmer@rivosinc.com
> Signed-off-by: Palmer Dabbelt <palmer@...osinc.com>
> ---
> Changes since v1 <20240119215612.20529-2-palmer@...osinc.com>:
> * Fix the return and arguments correctly.
> * Also fix the hvc_sbi_dbcn_tty_{get,put}().
> ---
>  drivers/tty/hvc/hvc_riscv_sbi.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/tty/hvc/hvc_riscv_sbi.c b/drivers/tty/hvc/hvc_riscv_sbi.c
> index 2f3571f17ecd..f8cd3310ef35 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 ssize_t hvc_sbi_tty_put(uint32_t vtermno, const u8 *buf, size_t count)
>  {
>         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 ssize_t hvc_sbi_tty_get(uint32_t vtermno, u8 *buf, size_t count)

The hvc_sbi_tty_put() and hvc_sbi_tty_get() functions are already
updated in Linus's tree. We only need to fix hvc_sbi_dbcn_tty_put()
and hvc_sbi_dbcn_tty_get()

Please rebase this fix upon Linux-6.8-rc1 whenever that is available.

>  {
>         int i, c;
>
> @@ -44,12 +44,12 @@ static const struct hv_ops hvc_sbi_v01_ops = {
>         .put_chars = hvc_sbi_tty_put,
>  };
>
> -static int hvc_sbi_dbcn_tty_put(uint32_t vtermno, const char *buf, int count)
> +static ssize_t hvc_sbi_dbcn_tty_put(uint32_t vtermno, const u8 *buf, size_t count)
>  {
>         return sbi_debug_console_write(buf, count);
>  }
>
> -static int hvc_sbi_dbcn_tty_get(uint32_t vtermno, char *buf, int count)
> +static ssize_t hvc_sbi_dbcn_tty_get(uint32_t vtermno, u8 *buf, size_t count)
>  {
>         return sbi_debug_console_read(buf, count);
>  }
> --
> 2.43.0
>
>

Reviewed-by: Anup Patel <anup@...infault.org>

Thanks,
Anup