From 02bc11de567273da8ab25c54336ddbb71986f38f Mon Sep 17 00:00:00 2001 From: Jiri Olsa Date: Mon, 10 Oct 2016 09:26:33 +0200 Subject: 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 Cc: Adrian Hunter Cc: David Ahern Cc: Namhyung Kim Cc: Wang Nan Link: http://lkml.kernel.org/n/tip-cayv2zbqi0nlmg5sjjxs1775@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/lib/find_bit.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'tools/lib/find_bit.c') diff --git a/tools/lib/find_bit.c b/tools/lib/find_bit.c index 9122a9e80046..6d8b8f22cf55 100644 --- a/tools/lib/find_bit.c +++ b/tools/lib/find_bit.c @@ -82,3 +82,28 @@ unsigned long find_first_bit(const unsigned long *addr, unsigned long size) 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 -- cgit v1.2.3-59-g8ed1b