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| author | Sven Schnelle <svens@linux.ibm.com> | 2025-01-08 15:27:02 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-02-17 09:40:03 +0100 |
| commit | 52c0b3cb6f031dd2ad69eb45a552e3d8563aaa16 (patch) | |
| tree | 514f077a1f49cdd24d6809c036aac7c0910cd449 /arch/s390 | |
| parent | dc5da273051e5667f2f3676ef96834c9b1e11dd2 (diff) | |
| download | linux-52c0b3cb6f031dd2ad69eb45a552e3d8563aaa16.tar.gz linux-52c0b3cb6f031dd2ad69eb45a552e3d8563aaa16.tar.bz2 linux-52c0b3cb6f031dd2ad69eb45a552e3d8563aaa16.zip | |
s390/stackleak: Use exrl instead of ex in __stackleak_poison()
[ Upstream commit a88c26bb8e04ee5f2678225c0130a5fbc08eef85 ]
exrl is present in all machines currently supported, therefore prefer
it over ex. This saves one instruction and doesn't need an additional
register to hold the address of the target instruction.
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/include/asm/processor.h | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h index e7338ed540d8..2f373e8cfed3 100644 --- a/arch/s390/include/asm/processor.h +++ b/arch/s390/include/asm/processor.h @@ -140,8 +140,7 @@ static __always_inline void __stackleak_poison(unsigned long erase_low, " la %[addr],256(%[addr])\n" " brctg %[tmp],0b\n" "1: stg %[poison],0(%[addr])\n" - " larl %[tmp],3f\n" - " ex %[count],0(%[tmp])\n" + " exrl %[count],3f\n" " j 4f\n" "2: stg %[poison],0(%[addr])\n" " j 4f\n" |