Messages in this thread Patch in this message | | | From | Alexey Bayduraev <> | Subject | [PATCH v5 09/20] tools lib: introduce bitmap_intersects() operation | Date | Tue, 4 May 2021 10:04:44 +0300 |
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Introduce bitmap_intersects() routine that tests whether bitmaps bitmap1 and bitmap2 intersects. This routine will be used during thread masks initialization.
Acked-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com> --- tools/include/linux/bitmap.h | 11 +++++++++++ tools/lib/bitmap.c | 14 ++++++++++++++ 2 files changed, 25 insertions(+)
diff --git a/tools/include/linux/bitmap.h b/tools/include/linux/bitmap.h index 477a1cae513f..2eb1d1084543 100644 --- a/tools/include/linux/bitmap.h +++ b/tools/include/linux/bitmap.h @@ -18,6 +18,8 @@ int __bitmap_and(unsigned long *dst, const unsigned long *bitmap1, int __bitmap_equal(const unsigned long *bitmap1, const unsigned long *bitmap2, unsigned int bits); void bitmap_clear(unsigned long *map, unsigned int start, int len); +int __bitmap_intersects(const unsigned long *bitmap1, + const unsigned long *bitmap2, unsigned int bits); #define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) & (BITS_PER_LONG - 1))) @@ -178,4 +180,13 @@ static inline int bitmap_equal(const unsigned long *src1, return __bitmap_equal(src1, src2, nbits); } +static inline int bitmap_intersects(const unsigned long *src1, + const unsigned long *src2, unsigned int nbits) +{ + if (small_const_nbits(nbits)) + return ((*src1 & *src2) & BITMAP_LAST_WORD_MASK(nbits)) != 0; + else + return __bitmap_intersects(src1, src2, nbits); +} + #endif /* _PERF_BITOPS_H */ diff --git a/tools/lib/bitmap.c b/tools/lib/bitmap.c index 5043747ef6c5..3cc3a5b43bb5 100644 --- a/tools/lib/bitmap.c +++ b/tools/lib/bitmap.c @@ -86,3 +86,17 @@ int __bitmap_equal(const unsigned long *bitmap1, return 1; } + +int __bitmap_intersects(const unsigned long *bitmap1, + const unsigned long *bitmap2, unsigned int bits) +{ + unsigned int k, lim = bits/BITS_PER_LONG; + for (k = 0; k < lim; ++k) + if (bitmap1[k] & bitmap2[k]) + return 1; + + if (bits % BITS_PER_LONG) + if ((bitmap1[k] & bitmap2[k]) & BITMAP_LAST_WORD_MASK(bits)) + return 1; + return 0; +} -- 2.19.0
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