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| author |   Heiko Carstens <hca@linux.ibm.com> | 2024-12-11 12:58:05 +0100 |
|---|---|---|
| committer |   Alexander Gordeev <agordeev@linux.ibm.com> | 2024-12-15 16:19:03 +0100 |
| commit | 5c9e37e5233ec3a6b4f2d160c697b8b28d13f134 (patch) | |
| tree | d21416e8d6c3732d403bf556ae3699fb9d10b979 | |
| parent | s390/atomic: Provide arch_atomic_*_and_test() implementations (diff) | |
| download | wireguard-linux-5c9e37e5233ec3a6b4f2d160c697b8b28d13f134.tar.xz wireguard-linux-5c9e37e5233ec3a6b4f2d160c697b8b28d13f134.zip | |
s390/preempt: Optimize __preempt_count_dec_and_test()
Use __atomic_add_const_and_test() within __preempt_count_dec_and_test().
With this it is possible to decrease preempt_count by one and test if
need_resched is set with one instruction, if the compiler has support for
flag output operand constraints.
Reviewed-by: Juergen Christ <jchrist@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Diffstat (limited to '')
| -rw-r--r-- | arch/s390/include/asm/preempt.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/include/asm/preempt.h b/arch/s390/include/asm/preempt.h index a55e1767b4d4..6ccd033acfe5 100644 --- a/arch/s390/include/asm/preempt.h +++ b/arch/s390/include/asm/preempt.h @@ -87,7 +87,7 @@ static __always_inline void __preempt_count_sub(int val) */ static __always_inline bool __preempt_count_dec_and_test(void) { - return __atomic_add(-1, &get_lowcore()->preempt_count) == 1; + return __atomic_add_const_and_test(-1, &get_lowcore()->preempt_count); } /* |