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lib: bitmap: add missing mask in bitmap_andnot

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Apparently, bitmap_andnot is supposed to return whether the new bitmap
is empty.  But it didn't take potential garbage bits in the last word
into account.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rasmus Villemoes 2014-08-06 16:10:24 -07:00 • committed by Linus Torvalds
parent 7e5f97d192
commit 74e7653190
2 changed files with 6 additions and 3 deletions
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2
include/linux/bitmap.h
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@ -217,7 +217,7 @@ static inline int bitmap_andnot(unsigned long *dst, const unsigned long *src1,
const unsigned long *src2, unsigned int nbits)
{
if (small_const_nbits(nbits))
return (*dst = *src1 & ~(*src2)) != 0;
return (*dst = *src1 & ~(*src2) & BITMAP_LAST_WORD_MASK(nbits)) != 0;
return __bitmap_andnot(dst, src1, src2, nbits);
}