+ arm64-kasan-simplify-and-inline-mte-functions-fix.patch added to -mm tree

+ arm64-kasan-simplify-and-inline-mte-functions-fix.patch added to -mm tree

[akpm]

The patch titled
     Subject: arm64: fix warning in mte_get_random_tag()
has been added to the -mm tree.  Its filename is
     arm64-kasan-simplify-and-inline-mte-functions-fix.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/arm64-kasan-simplify-and-inline-mte-functions-fix.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/arm64-kasan-simplify-and-inline-mte-functions-fix.patch

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------------------------------------------------------
From: Vincenzo Frascino <vincenzo.frascino@arm.com>
Subject: arm64: fix warning in mte_get_random_tag()

The simplification of mte_get_random_tag() caused the introduction of the
warning below:

In file included from arch/arm64/include/asm/kasan.h:9,
                 from include/linux/kasan.h:16,
                 from mm/kasan/common.c:14:
mm/kasan/common.c: In function `mte_get_random_tag':
arch/arm64/include/asm/mte-kasan.h:45:9: warning: `addr' is used
                                         uninitialized [-Wuninitialized]
   45 |         asm(__MTE_PREAMBLE "irg %0, %0"
      |

Fix the warning using "=r" for the address in the asm inline.

Link: https://lkml.kernel.org/r/20210211152208.23811-1-vincenzo.frascino@arm.com
Fixes: c8f8de4c0887 ("arm64: kasan: simplify and inline MTE functions")
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Acked-by: Andrey Konovalov <andreyknvl@google.com>
Tested-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Marco Elver <elver@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/arm64/include/asm/mte-kasan.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/arm64/include/asm/mte-kasan.h~arm64-kasan-simplify-and-inline-mte-functions-fix
+++ a/arch/arm64/include/asm/mte-kasan.h
@@ -43,7 +43,7 @@ static inline u8 mte_get_random_tag(void
 	void *addr;
 
 	asm(__MTE_PREAMBLE "irg %0, %0"
-		: "+r" (addr));
+		: "=r" (addr));
 
 	return mte_get_ptr_tag(addr);
 }
_

Patches currently in -mm which might be from vincenzo.frascino@arm.com are

arm64-kasan-simplify-and-inline-mte-functions-fix.patch