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| author | Heiko Carstens <hca@linux.ibm.com> | 2024-11-26 14:28:25 +0100 |
|---|---|---|
| committer | Heiko Carstens <hca@linux.ibm.com> | 2024-11-28 14:12:04 +0100 |
| commit | 1200f216a3043ad78e89ce1f573fe6d62ed5e5d0 (patch) | |
| tree | 125fec8ae83b8d40611300ccc758f9b36a4f68ea /arch/s390 | |
| parent | 2c3bc137f1e339c4fa9485ec4028433b8cb7374b (diff) | |
| download | linux-stable-1200f216a3043ad78e89ce1f573fe6d62ed5e5d0.tar.gz linux-stable-1200f216a3043ad78e89ce1f573fe6d62ed5e5d0.tar.bz2 linux-stable-1200f216a3043ad78e89ce1f573fe6d62ed5e5d0.zip | |
s390/spinlock: Generate shorter code for arch_spin_unlock()
Use mvhhi instead of sth to write a zero to spinlocks. Compared to the
sth variant this avoids the load of zero to a register, and reduces
register pressure.
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/include/asm/spinlock.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/s390/include/asm/spinlock.h b/arch/s390/include/asm/spinlock.h index 9601e27d3291..f87dd0a84855 100644 --- a/arch/s390/include/asm/spinlock.h +++ b/arch/s390/include/asm/spinlock.h @@ -82,9 +82,9 @@ static inline void arch_spin_unlock(arch_spinlock_t *lp) kcsan_release(); asm_inline volatile( ALTERNATIVE("nop", ".insn rre,0xb2fa0000,7,0", ALT_FACILITY(49)) /* NIAI 7 */ - " sth %[zero],%[lock]\n" - : [lock] "=R" (((unsigned short *)&lp->lock)[1]) - : [zero] "d" (0) + " mvhhi %[lock],0\n" + : [lock] "=Q" (((unsigned short *)&lp->lock)[1]) + : : "memory"); } |