diff options
| author | Jiri Olsa <jolsa@kernel.org> | 2016-10-10 09:26:33 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-10-24 11:07:33 -0300 |
| commit | 02bc11de567273da8ab25c54336ddbb71986f38f (patch) | |
| tree | 2356fcbb1ad8571a14e61ca58575a752c3de6c2c /tools/include/asm-generic/bitops | |
| parent | fe316723a8106c7527710ae7085a1dc6a9c1ab05 (diff) | |
tools lib: Add for_each_clear_bit macro
Adding for_each_clear_bit macro plus all its the necessary backbone
functions. Taken from related kernel code. It will be used in following
patch.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-cayv2zbqi0nlmg5sjjxs1775@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/include/asm-generic/bitops')
| -rw-r--r-- | tools/include/asm-generic/bitops/__ffz.h | 12 | ||||
| -rw-r--r-- | tools/include/asm-generic/bitops/find.h | 28 |
2 files changed, 40 insertions, 0 deletions
diff --git a/tools/include/asm-generic/bitops/__ffz.h b/tools/include/asm-generic/bitops/__ffz.h new file mode 100644 index 000000000000..6744bd4cdf46 --- /dev/null +++ b/tools/include/asm-generic/bitops/__ffz.h @@ -0,0 +1,12 @@ +#ifndef _ASM_GENERIC_BITOPS_FFZ_H_ +#define _ASM_GENERIC_BITOPS_FFZ_H_ + +/* + * ffz - find first zero in word. + * @word: The word to search + * + * Undefined if no zero exists, so code should check against ~0UL first. + */ +#define ffz(x) __ffs(~(x)) + +#endif /* _ASM_GENERIC_BITOPS_FFZ_H_ */ diff --git a/tools/include/asm-generic/bitops/find.h b/tools/include/asm-generic/bitops/find.h index 31f51547fcd4..5538ecdc964a 100644 --- a/tools/include/asm-generic/bitops/find.h +++ b/tools/include/asm-generic/bitops/find.h @@ -15,6 +15,21 @@ extern unsigned long find_next_bit(const unsigned long *addr, unsigned long size, unsigned long offset); #endif +#ifndef find_next_zero_bit + +/** + * find_next_zero_bit - find the next cleared bit in a memory region + * @addr: The address to base the search on + * @offset: The bitnumber to start searching at + * @size: The bitmap size in bits + * + * Returns the bit number of the next zero bit + * If no bits are zero, returns @size. + */ +unsigned long find_next_zero_bit(const unsigned long *addr, unsigned long size, + unsigned long offset); +#endif + #ifndef find_first_bit /** @@ -30,4 +45,17 @@ extern unsigned long find_first_bit(const unsigned long *addr, #endif /* find_first_bit */ +#ifndef find_first_zero_bit + +/** + * find_first_zero_bit - find the first cleared bit in a memory region + * @addr: The address to start the search at + * @size: The maximum number of bits to search + * + * Returns the bit number of the first cleared bit. + * If no bits are zero, returns @size. + */ +unsigned long find_first_zero_bit(const unsigned long *addr, unsigned long size); +#endif + #endif /*_TOOLS_LINUX_ASM_GENERIC_BITOPS_FIND_H_ */ |