diff options
| author | Sven Schnelle <svens@linux.ibm.com> | 2025-01-08 15:27:02 +0100 |
|---|---|---|
| committer | Alexander Gordeev <agordeev@linux.ibm.com> | 2025-01-13 09:50:17 +0100 |
| commit | a88c26bb8e04ee5f2678225c0130a5fbc08eef85 (patch) | |
| tree | 241b6087f560abddef59a74213e585a8e635c2d4 | |
| parent | 745600ed696593436d2b69211a3d85b588ee18d8 (diff) | |
s390/stackleak: Use exrl instead of ex in __stackleak_poison()
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>
| -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 8761fd01a9f0..4f8d5592c298 100644 --- a/arch/s390/include/asm/processor.h +++ b/arch/s390/include/asm/processor.h @@ -163,8 +163,7 @@ 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" |