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

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Date: Thu, 21 Dec 2023 19:00:42 +0100
From: andrey.konovalov@...ux.dev
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andrey Konovalov <andreyknvl@...il.com>,
	Marco Elver <elver@...gle.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: [PATCH mm] kasan: Mark unpoison_slab_object() as static

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>

---

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