linux-kernel - Re: [PATCH v2] checkpatch: Mark kunmap() and kunmap

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Date:   Thu, 29 Dec 2022 16:12:00 -0800
From:   Joe Perches <joe@...ches.com>
To:     Ira Weiny <ira.weiny@...el.com>,
        Andy Whitcroft <apw@...onical.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org,
        "Fabio M. De Francesco" <fmdefrancesco@...il.com>
Subject: Re: [PATCH v2] checkpatch: Mark kunmap() and kunmap_atomic()
 deprecated

On Thu, 2022-12-29 at 14:17 -0800, Ira Weiny wrote:
> It was suggested by Fabio that kunmap() be marked deprecated in
> checkpatch.[1]  This did not seem necessary until an invalid conversion
> of kmap_local_page() appeared in mainline.[2][3]  The introduction of
> this bug would have been flagged with kunmap() being marked deprecated.
> 
> Add kunmap() and kunmap_atomic() to checkpatch to help prevent further
> confusion.

Acked-by: Joe Perches <joe@...ches.com>

> 
> [1] https://lore.kernel.org/all/1884934.6tgchFWduM@suse/
> [2] d406d26745ab ("cifs: skip alloc when request has no pages")
> [3] https://lore.kernel.org/r/20221229-cifs-kmap-v1-1-c70d0e9a53eb@intel.com
> 
> Cc: Andy Whitcroft <apw@...onical.com>
> Cc: Joe Perches <joe@...ches.com>
> Suggested-by: "Fabio M. De Francesco" <fmdefrancesco@...il.com>
> Signed-off-by: Ira Weiny <ira.weiny@...el.com>
> ---
> Changes in v2:
> - Add LKML and send directly to Andy and Joe (I'm still learning b4 send...)
> - Link to v1: https://lore.kernel.org/r/20221229-kmap-checkpatch-v1-1-6b86bcf5080a@intel.com
> ---
>  scripts/checkpatch.pl | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index 78cc595b98ce..a6d6d7e1d0cf 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -823,7 +823,9 @@ our %deprecated_apis = (
>  	"get_state_synchronize_sched"		=> "get_state_synchronize_rcu",
>  	"cond_synchronize_sched"		=> "cond_synchronize_rcu",
>  	"kmap"					=> "kmap_local_page",
> +	"kunmap"				=> "kunmap_local",
>  	"kmap_atomic"				=> "kmap_local_page",
> +	"kunmap_atomic"				=> "kunmap_local",
>  );
>  
>  #Create a search pattern for all these strings to speed up a loop below
> 
> ---
> base-commit: 1b929c02afd37871d5afb9d498426f83432e71c2
> change-id: 20221229-kmap-checkpatch-763cc2ace8e5
> 
> Best regards,