linux-kernel - Re: [PATCH mm] kasan: Mark unpoison_slab

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Date: Thu, 21 Dec 2023 21:07:20 +0100
From: Marco Elver <elver@...gle.com>
To: andrey.konovalov@...ux.dev
Cc: Andrew Morton <akpm@...ux-foundation.org>, Andrey Konovalov <andreyknvl@...il.com>, 
	Alexander Potapenko <glider@...gle.com>, Dmitry Vyukov <dvyukov@...gle.com>, Vlastimil Babka <vbabka@...e.cz>, 
	kasan-dev@...glegroups.com, Nathan Chancellor <nathan@...nel.org>, 
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>, linux-mm@...ck.org, 
	linux-kernel@...r.kernel.org, Andrey Konovalov <andreyknvl@...gle.com>
Subject: Re: [PATCH mm] kasan: Mark unpoison_slab_object() as static

On Thu, 21 Dec 2023 at 19:00, <andrey.konovalov@...ux.dev> wrote:
>
> From: Nathan Chancellor <nathan@...nel.org>
>
> With -Wmissing-prototypes enabled, there is a warning that
> unpoison_slab_object() has no prototype, breaking the build with
> CONFIG_WERROR=y:
>
>   mm/kasan/common.c:271:6: error: no previous prototype for 'unpoison_slab_object' [-Werror=missing-prototypes]
>     271 | void unpoison_slab_object(struct kmem_cache *cache, void *object, gfp_t flags,
>         |      ^~~~~~~~~~~~~~~~~~~~
>   cc1: all warnings being treated as errors
>
> Mark the function as static, as it is not used outside of this
> translation unit, clearing up the warning.
>
> Fixes: 3f38c3c5bc40 ("kasan: save alloc stack traces for mempool")
> Signed-off-by: Nathan Chancellor <nathan@...nel.org>
> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>

Reviewed-by: Marco Elver <elver@...gle.com>

> ---
>
> Changes v1->v2:
> - Mark as "static inline" instead of just "static".
> ---
>  mm/kasan/common.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/mm/kasan/common.c b/mm/kasan/common.c
> index ebb1b23d6480..f4255e807b74 100644
> --- a/mm/kasan/common.c
> +++ b/mm/kasan/common.c
> @@ -277,8 +277,8 @@ void __kasan_kfree_large(void *ptr, unsigned long ip)
>         /* The object will be poisoned by kasan_poison_pages(). */
>  }
>
> -void unpoison_slab_object(struct kmem_cache *cache, void *object, gfp_t flags,
> -                         bool init)
> +static inline void unpoison_slab_object(struct kmem_cache *cache, void *object,
> +                                       gfp_t flags, bool init)
>  {
>         /*
>          * Unpoison the whole object. For kmalloc() allocations,
> --
> 2.25.1
>