linux-kernel - Re: [PATCH] lib/zlib: remove redundation assignement of avail_in dfltcc

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Date:   Sun, 29 Jan 2023 20:07:00 +0100
From:   Ilya Leoshkevich <iii@...ux.ibm.com>
To:     Tom Rix <trix@...hat.com>, zaslonko@...ux.ibm.com,
        akpm@...ux-foundation.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] lib/zlib: remove redundation assignement of avail_in
 dfltcc_gdht()

On Sat, 2023-01-28 at 08:50 -0800, Tom Rix wrote:
> cppcheck reports
> lib/zlib_dfltcc/dfltcc_deflate.c:65:21: warning: Redundant assignment
> of 'avail_in' to itself. [selfAssignment]
>     size_t avail_in = avail_in = strm->avail_in;
> 
> Only setting avail_in once is needed.
> 
> Fixes: aa5b395b69b6 ("lib/zlib: add s390 hardware support for kernel
> zlib_deflate")
> Signed-off-by: Tom Rix <trix@...hat.com>
> ---
>  lib/zlib_dfltcc/dfltcc_deflate.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/lib/zlib_dfltcc/dfltcc_deflate.c
> b/lib/zlib_dfltcc/dfltcc_deflate.c
> index 80924f067c24..b732b6d9e35d 100644
> --- a/lib/zlib_dfltcc/dfltcc_deflate.c
> +++ b/lib/zlib_dfltcc/dfltcc_deflate.c
> @@ -62,7 +62,7 @@ static void dfltcc_gdht(
>  {
>      deflate_state *state = (deflate_state *)strm->state;
>      struct dfltcc_param_v0 *param = &GET_DFLTCC_STATE(state)->param;
> -    size_t avail_in = avail_in = strm->avail_in;
> +    size_t avail_in = strm->avail_in;
>  
>      dfltcc(DFLTCC_GDHT,
>             param, NULL, NULL,

Thanks for spotting this!

Acked-by: Ilya Leoshkevich <iii@...ux.ibm.com>