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tools lib: Add bitmap_and function

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Add support to perform logical and on bitmaps.  Code taken from kernel's
include/linux/bitmap.h.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1470074555-24889-4-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2016-08-01 20:02:31 +02:00 • committed by Arnaldo Carvalho de Melo
parent 820d12b70f
commit 741c74f55e
2 changed files with 32 additions and 0 deletions
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15
tools/lib/bitmap.c
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@ -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;
}