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> extern unsigned long _find_first_and_bit(const unsigned long *addr1, > const unsigned long *addr2, unsigned long size); > +unsigned long _find_first_andnot_bit(const unsigned long *addr1, const unsigned long *addr2, > + unsigned long size); > unsigned long _find_first_and_and_bit(const unsigned long *addr1, const unsigned long *addr2, > const unsigned long *addr3, unsigned long size); > extern unsigned long _find_first_zero_bit(const unsigned long *addr, unsigned long size); > @@ -347,6 +349,29 @@ unsigned long find_first_and_bit(const unsigned long *addr1, > } > #endif > > +/** > + * find_first_andnot_bit - find the first bit set in 1st memory region and unset in 2nd > + * @addr1: The first address to base the search on > + * @addr2: The second address to base the search on > + * @size: The bitmap size in bits > + * > + * Returns the bit number for the first set bit > + * If no bits are set, returns >= @size. > + */ > +static __always_inline > +unsigned long find_first_andnot_bit(const unsigned long *addr1, > + const unsigned long *addr2, > + unsigned long size) CHECK: Alignment should match open parenthesis > +{ > + if (small_const_nbits(size)) { > + unsigned long val = *addr1 & (~*addr2) & GENMASK(size - 1, 0); > + > + return val ? __ffs(val) : size; > + } > + > + return _find_first_andnot_bit(addr1, addr2, size); > +} > + > /** > * find_first_and_and_bit - find the first set bit in 3 memory regions > * @addr1: The first address to base the search on > diff --git a/lib/find_bit.c b/lib/find_bit.c > index 0836bb3d76c5..06b6342aa3ae 100644 > --- a/lib/find_bit.c > +++ b/lib/find_bit.c > @@ -116,6 +116,17 @@ unsigned long _find_first_and_bit(const unsigned long *addr1, > EXPORT_SYMBOL(_find_first_and_bit); > #endif > > +/* > + * Find the first bit set in 1st memory region and unset in 2nd. > + */ > +unsigned long _find_first_andnot_bit(const unsigned long *addr1, > + const unsigned long *addr2, > + unsigned long size) Ditto. > +{ > + return FIND_FIRST_BIT(addr1[idx] & ~addr2[idx], /* nop */, size); > +} > +EXPORT_SYMBOL(_find_first_andnot_bit); > + > /* > * Find the first set bit in three memory regions. > */ Thanks. -Fenghua