+ kasan-mark-addr_has_metadata-__always_inline.patch added to mm-unstable branch

+ kasan-mark-addr_has_metadata-__always_inline.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: kasan: mark addr_has_metadata __always_inline
has been added to the -mm mm-unstable branch.  Its filename is
     kasan-mark-addr_has_metadata-__always_inline.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/kasan-mark-addr_has_metadata-__always_inline.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Arnd Bergmann <arnd@arndb.de>
Subject: kasan: mark addr_has_metadata __always_inline
Date: Wed, 15 Feb 2023 14:00:56 +0100

Patch series "objtool warning fixes", v2.

These are three of the easier fixes for objtool warnings around
kasan/kmsan/kcsan.  I dropped one patch since Peter had come up with a
better fix, and adjusted the changelog text based on feedback.


This patch (of 3):

When the compiler decides not to inline this function, objtool complains
about incorrect UACCESS state:

mm/kasan/generic.o: warning: objtool: __asan_load2+0x11: call to addr_has_metadata() with UACCESS enabled

Link: https://lore.kernel.org/all/20230208164011.2287122-1-arnd@kernel.org/
Link: https://lkml.kernel.org/r/20230215130058.3836177-2-arnd@kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Marco Elver <elver@google.com>
Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Josh Poimboeuf <jpoimboe@kernel.org>
Cc: Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/kasan/kasan.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/mm/kasan/kasan.h~kasan-mark-addr_has_metadata-__always_inline
+++ a/mm/kasan/kasan.h
@@ -297,7 +297,7 @@ static inline const void *kasan_shadow_t
 		<< KASAN_SHADOW_SCALE_SHIFT);
 }
 
-static inline bool addr_has_metadata(const void *addr)
+static __always_inline bool addr_has_metadata(const void *addr)
 {
 	return (kasan_reset_tag(addr) >=
 		kasan_shadow_to_mem((void *)KASAN_SHADOW_START));
@@ -316,7 +316,7 @@ bool kasan_check_range(unsigned long add
 
 #else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
 
-static inline bool addr_has_metadata(const void *addr)
+static __always_inline bool addr_has_metadata(const void *addr)
 {
 	return (is_vmalloc_addr(addr) || virt_addr_valid(addr));
 }
_

Patches currently in -mm which might be from arnd@arndb.de are

maple_tree-reduce-stack-usage-with-gcc-9-and-earlier.patch
kasan-mark-addr_has_metadata-__always_inline.patch
kmsan-disable-ftrace-in-kmsan-core-code.patch
objtool-add-uaccess-exceptions-for-__tsan_volatile_read-write.patch