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| author | Catalin Marinas <catalin.marinas@arm.com> | 2013-03-21 17:28:47 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2013-03-21 18:39:31 +0100 |
| commit | 62479586532715b6da4777374a6f53b32453385e (patch) | |
| tree | 232004eb56bf36b966ea11ec8295a1b2893ac9e9 /arch/arm64/include/asm/bitops.h | |
| parent | arm64: klib: Optimised string functions (diff) | |
| download | linux-62479586532715b6da4777374a6f53b32453385e.tar.xz linux-62479586532715b6da4777374a6f53b32453385e.zip | |
arm64: klib: Optimised atomic bitops
This patch implements the AArch64-specific atomic bitops functions using
exclusive memory accesses to avoid locking.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/bitops.h')
| -rw-r--r-- | arch/arm64/include/asm/bitops.h | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/arch/arm64/include/asm/bitops.h b/arch/arm64/include/asm/bitops.h index 5e693073b030..aa5b59d6ba43 100644 --- a/arch/arm64/include/asm/bitops.h +++ b/arch/arm64/include/asm/bitops.h @@ -32,6 +32,16 @@ #error only <linux/bitops.h> can be included directly #endif +/* + * Little endian assembly atomic bitops. + */ +extern void set_bit(int nr, volatile unsigned long *p); +extern void clear_bit(int nr, volatile unsigned long *p); +extern void change_bit(int nr, volatile unsigned long *p); +extern int test_and_set_bit(int nr, volatile unsigned long *p); +extern int test_and_clear_bit(int nr, volatile unsigned long *p); +extern int test_and_change_bit(int nr, volatile unsigned long *p); + #include <asm-generic/bitops/builtin-__ffs.h> #include <asm-generic/bitops/builtin-ffs.h> #include <asm-generic/bitops/builtin-__fls.h> @@ -45,9 +55,13 @@ #include <asm-generic/bitops/hweight.h> #include <asm-generic/bitops/lock.h> -#include <asm-generic/bitops/atomic.h> #include <asm-generic/bitops/non-atomic.h> #include <asm-generic/bitops/le.h> -#include <asm-generic/bitops/ext2-atomic.h> + +/* + * Ext2 is defined to use little-endian byte ordering. + */ +#define ext2_set_bit_atomic(lock, nr, p) test_and_set_bit_le(nr, p) +#define ext2_clear_bit_atomic(lock, nr, p) test_and_clear_bit_le(nr, p) #endif /* __ASM_BITOPS_H */ |