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fb72014d98
We need to refactor code to be explicitely shared by the kernel and at least the tools/ userspace programs, so, till we do that, copy the bare minimum bitmap/bitops code needed by tools/perf. Reported-by: "H. Peter Anvin" <hpa@zytor.com> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
35 lines
824 B
C
35 lines
824 B
C
#ifndef _PERF_BITOPS_H
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#define _PERF_BITOPS_H
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#include <string.h>
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#include <linux/bitops.h>
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int __bitmap_weight(const unsigned long *bitmap, int bits);
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#define BITMAP_LAST_WORD_MASK(nbits) \
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( \
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((nbits) % BITS_PER_LONG) ? \
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(1UL<<((nbits) % BITS_PER_LONG))-1 : ~0UL \
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)
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#define small_const_nbits(nbits) \
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(__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG)
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static inline void bitmap_zero(unsigned long *dst, int nbits)
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{
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if (small_const_nbits(nbits))
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*dst = 0UL;
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else {
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int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
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memset(dst, 0, len);
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}
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}
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static inline int bitmap_weight(const unsigned long *src, int nbits)
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{
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if (small_const_nbits(nbits))
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return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits));
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return __bitmap_weight(src, nbits);
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}
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#endif /* _PERF_BITOPS_H */
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