diff options
| author | Matthew Wilcox (Oracle) <[email protected]> | 2023-10-04 17:53:13 +0100 |
|---|---|---|
| committer | Andrew Morton <[email protected]> | 2023-10-18 14:34:17 -0700 |
| commit | 12010aa89f8705c8bacddc5c2276cc80badeac56 (patch) | |
| tree | 7f7ad6f9761e7981900df106ff490b8ad5ccfea1 | |
| parent | 2a667285b53c58d72f8bdb736c040f0f36bff58a (diff) | |
s390: implement arch_xor_unlock_is_negative_byte
Inspired by the s390 arch_test_and_clear_bit(), this will surely be more
efficient than the generic one defined in filemap.c.
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Matthew Wilcox (Oracle) <[email protected]>
Cc: Albert Ou <[email protected]>
Cc: Alexander Gordeev <[email protected]>
Cc: Andreas Dilger <[email protected]>
Cc: Christian Borntraeger <[email protected]>
Cc: Christophe Leroy <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Ivan Kokshaysky <[email protected]>
Cc: Matt Turner <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Nicholas Piggin <[email protected]>
Cc: Palmer Dabbelt <[email protected]>
Cc: Paul Walmsley <[email protected]>
Cc: Richard Henderson <[email protected]>
Cc: Sven Schnelle <[email protected]>
Cc: "Theodore Ts'o" <[email protected]>
Cc: Thomas Bogendoerfer <[email protected]>
Cc: Vasily Gorbik <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
| -rw-r--r-- | arch/s390/include/asm/bitops.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/s390/include/asm/bitops.h b/arch/s390/include/asm/bitops.h index 2de74fcd0578..c467dffa8c12 100644 --- a/arch/s390/include/asm/bitops.h +++ b/arch/s390/include/asm/bitops.h @@ -201,6 +201,16 @@ static inline void arch___clear_bit_unlock(unsigned long nr, arch___clear_bit(nr, ptr); } +static inline bool arch_xor_unlock_is_negative_byte(unsigned long mask, + volatile unsigned long *ptr) +{ + unsigned long old; + + old = __atomic64_xor_barrier(mask, (long *)ptr); + return old & BIT(7); +} +#define arch_xor_unlock_is_negative_byte arch_xor_unlock_is_negative_byte + #include <asm-generic/bitops/instrumented-atomic.h> #include <asm-generic/bitops/instrumented-non-atomic.h> #include <asm-generic/bitops/instrumented-lock.h> |