Messages in this thread | | | Date | Wed, 30 Jun 2021 14:24:26 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: [PATCH v8 09/22] tools lib: Introduce bitmap_intersects() operation |
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Em Wed, Jun 30, 2021 at 06:54:48PM +0300, Alexey Bayduraev escreveu: > Introduce bitmap_intersects() routine that tests whether
Is this _adopting_ bitmap_intersects() from the kernel sources?
> bitmaps bitmap1 and bitmap2 intersects. This routine will > be used during thread masks initialization. > > Acked-by: Andi Kleen <ak@linux.intel.com> > Acked-by: Namhyung Kim <namhyung@gmail.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 330dbf7509cc..9d959bc24859 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))) > #define BITMAP_LAST_WORD_MASK(nbits) (~0UL >> (-(nbits) & (BITS_PER_LONG - 1))) > @@ -170,4 +172,13 @@ 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 f4e914712b6f..db466ef7be9d 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 >
--
- Arnaldo
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