linux-kernel - [PATCH 1/2] kasan: add kasan_tag

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Date:   Tue,  9 May 2023 16:57:20 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Marco Elver <elver@...gle.com>, kasan-dev@...glegroups.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] kasan: add kasan_tag_mismatch prototype

From: Arnd Bergmann <arnd@...db.de>

The kasan sw-tags implementation contains one function that is only
called from assembler and has no prototype in a header. This causes
a W=1 warning:

mm/kasan/sw_tags.c:171:6: warning: no previous prototype for 'kasan_tag_mismatch' [-Wmissing-prototypes]
  171 | void kasan_tag_mismatch(unsigned long addr, unsigned long access_info,

Add a prototype in the local header to get a clean build.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 mm/kasan/kasan.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
index f5e4f5f2ba20..cd846ca34f44 100644
--- a/mm/kasan/kasan.h
+++ b/mm/kasan/kasan.h
@@ -646,4 +646,7 @@ void *__hwasan_memset(void *addr, int c, size_t len);
 void *__hwasan_memmove(void *dest, const void *src, size_t len);
 void *__hwasan_memcpy(void *dest, const void *src, size_t len);
 
+void kasan_tag_mismatch(unsigned long addr, unsigned long access_info,
+			unsigned long ret_ip);
+
 #endif /* __MM_KASAN_KASAN_H */
-- 
2.35.1