From 741c74f55e8a66f3bc5bbc29dc162c952759e47b Mon Sep 17 00:00:00 2001 From: Jiri Olsa Date: Mon, 1 Aug 2016 20:02:31 +0200 Subject: tools lib: Add bitmap_and function Add support to perform logical and on bitmaps. Code taken from kernel's include/linux/bitmap.h. Signed-off-by: Jiri Olsa Cc: David Ahern Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1470074555-24889-4-git-send-email-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/include/linux/bitmap.h | 17 +++++++++++++++++ tools/lib/bitmap.c | 15 +++++++++++++++ 2 files changed, 32 insertions(+) (limited to 'tools') diff --git a/tools/include/linux/bitmap.h b/tools/include/linux/bitmap.h index 1cdded0041a8..43c1c5021e4b 100644 --- a/tools/include/linux/bitmap.h +++ b/tools/include/linux/bitmap.h @@ -11,6 +11,8 @@ int __bitmap_weight(const unsigned long *bitmap, int bits); void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1, const unsigned long *bitmap2, int bits); +int __bitmap_and(unsigned long *dst, const unsigned long *bitmap1, + const unsigned long *bitmap2, unsigned int bits); #define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) & (BITS_PER_LONG - 1))) @@ -85,4 +87,19 @@ static inline unsigned long *bitmap_alloc(int nbits) size_t bitmap_scnprintf(unsigned long *bitmap, int nbits, char *buf, size_t size); +/** + * bitmap_and - Do logical and on bitmaps + * @dst: resulting bitmap + * @src1: operand 1 + * @src2: operand 2 + * @nbits: size of bitmap + */ +static inline int bitmap_and(unsigned long *dst, const unsigned long *src1, + const unsigned long *src2, unsigned int nbits) +{ + if (small_const_nbits(nbits)) + return (*dst = *src1 & *src2 & BITMAP_LAST_WORD_MASK(nbits)) != 0; + return __bitmap_and(dst, src1, src2, nbits); +} + #endif /* _PERF_BITOPS_H */ diff --git a/tools/lib/bitmap.c b/tools/lib/bitmap.c index 5c7e3185507c..38748b0e342f 100644 --- a/tools/lib/bitmap.c +++ b/tools/lib/bitmap.c @@ -58,3 +58,18 @@ size_t bitmap_scnprintf(unsigned long *bitmap, int nbits, } return ret; } + +int __bitmap_and(unsigned long *dst, const unsigned long *bitmap1, + const unsigned long *bitmap2, unsigned int bits) +{ + unsigned int k; + unsigned int lim = bits/BITS_PER_LONG; + unsigned long result = 0; + + for (k = 0; k < lim; k++) + result |= (dst[k] = bitmap1[k] & bitmap2[k]); + if (bits % BITS_PER_LONG) + result |= (dst[k] = bitmap1[k] & bitmap2[k] & + BITMAP_LAST_WORD_MASK(bits)); + return result != 0; +} -- cgit v1.2.3