4.9-stable review patch. If anyone has any objections, please let me know.
------------------ From: Jiri Olsa <jo...@kernel.org> commit 02bc11de567273da8ab25c54336ddbb71986f38f upstream. 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 <jo...@kernel.org> Cc: Adrian Hunter <adrian.hun...@intel.com> Cc: David Ahern <dsah...@gmail.com> Cc: Namhyung Kim <namhy...@kernel.org> Cc: Wang Nan <wangn...@huawei.com> Link: http://lkml.kernel.org/n/tip-cayv2zbqi0nlmg5sjjxs1...@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> --- tools/include/asm-generic/bitops.h | 1 + tools/include/asm-generic/bitops/__ffz.h | 12 ++++++++++++ tools/include/asm-generic/bitops/find.h | 28 ++++++++++++++++++++++++++++ tools/include/linux/bitops.h | 5 +++++ tools/lib/find_bit.c | 25 +++++++++++++++++++++++++ tools/perf/MANIFEST | 1 + 6 files changed, 72 insertions(+) --- a/tools/include/asm-generic/bitops.h +++ b/tools/include/asm-generic/bitops.h @@ -13,6 +13,7 @@ */ #include <asm-generic/bitops/__ffs.h> +#include <asm-generic/bitops/__ffz.h> #include <asm-generic/bitops/fls.h> #include <asm-generic/bitops/__fls.h> #include <asm-generic/bitops/fls64.h> --- /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_ */ --- 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 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(cons #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_ */ --- a/tools/include/linux/bitops.h +++ b/tools/include/linux/bitops.h @@ -39,6 +39,11 @@ extern unsigned long __sw_hweight64(__u6 (bit) < (size); \ (bit) = find_next_bit((addr), (size), (bit) + 1)) +#define for_each_clear_bit(bit, addr, size) \ + for ((bit) = find_first_zero_bit((addr), (size)); \ + (bit) < (size); \ + (bit) = find_next_zero_bit((addr), (size), (bit) + 1)) + /* same as for_each_set_bit() but use bit as value to start with */ #define for_each_set_bit_from(bit, addr, size) \ for ((bit) = find_next_bit((addr), (size), (bit)); \ --- a/tools/lib/find_bit.c +++ b/tools/lib/find_bit.c @@ -82,3 +82,28 @@ unsigned long find_first_bit(const unsig return size; } #endif + +#ifndef find_first_zero_bit +/* + * Find the first cleared bit in a memory region. + */ +unsigned long find_first_zero_bit(const unsigned long *addr, unsigned long size) +{ + unsigned long idx; + + for (idx = 0; idx * BITS_PER_LONG < size; idx++) { + if (addr[idx] != ~0UL) + return min(idx * BITS_PER_LONG + ffz(addr[idx]), size); + } + + return size; +} +#endif + +#ifndef find_next_zero_bit +unsigned long find_next_zero_bit(const unsigned long *addr, unsigned long size, + unsigned long offset) +{ + return _find_next_bit(addr, size, offset, ~0UL); +} +#endif --- a/tools/perf/MANIFEST +++ b/tools/perf/MANIFEST @@ -51,6 +51,7 @@ tools/include/asm-generic/bitops/arch_hw tools/include/asm-generic/bitops/atomic.h tools/include/asm-generic/bitops/const_hweight.h tools/include/asm-generic/bitops/__ffs.h +tools/include/asm-generic/bitops/__ffz.h tools/include/asm-generic/bitops/__fls.h tools/include/asm-generic/bitops/find.h tools/include/asm-generic/bitops/fls64.h
