linux-kernel - Re: [PATCH] coccinelle: misc: minmax: suppress patch generation for err returns

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Message-ID: <30d69ef1-6a6e-ee96-fa27-2d9d2ad8da48@linux.com>
Date:   Thu, 22 Apr 2021 10:21:39 +0300
From:   Denis Efremov <efremov@...ux.com>
To:     julia.lawall@...ia.fr
Cc:     cocci@...teme.lip6.fr, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] coccinelle: misc: minmax: suppress patch generation for
 err returns

Ping?

On 4/9/21 2:19 PM, Denis Efremov wrote:
> There is a standard idiom for "if 'ret' holds an error, return it":
> 	return ret < 0 ? ret : 0;
> 
> Developers prefer to keep the things as they are because stylistic
> change to "return min(ret, 0);" breaks readability.
> 
> Let's suppress automatic generation for this type of patches.
> 
> Signed-off-by: Denis Efremov <efremov@...ux.com>
> ---
>  scripts/coccinelle/misc/minmax.cocci | 18 +++++++++++++++++-
>  1 file changed, 17 insertions(+), 1 deletion(-)
> 
> diff --git a/scripts/coccinelle/misc/minmax.cocci b/scripts/coccinelle/misc/minmax.cocci
> index eccdd3eb3452..fcf908b34f27 100644
> --- a/scripts/coccinelle/misc/minmax.cocci
> +++ b/scripts/coccinelle/misc/minmax.cocci
> @@ -116,16 +116,32 @@ func(...)
>  	...>
>  }
>  
> +// Don't generate patches for errcode returns.
> +@...code depends on patch@
> +position p;
> +identifier func;
> +expression x;
> +binary operator cmp = {<, <=};
> +@@
> +
> +func(...)
> +{
> +	<...
> +	return ((x) cmp@p 0 ? (x) : 0);
> +	...>
> +}
> +
>  @pmin depends on patch@
>  identifier func;
>  expression x, y;
>  binary operator cmp = {<=, <};
> +position p != errcode.p;
>  @@
>  
>  func(...)
>  {
>  	<...
> --	((x) cmp (y) ? (x) : (y))
> +-	((x) cmp@p (y) ? (x) : (y))
>  +	min(x, y)
>  	...>
>  }
>