| > Also, set_mask_bits is used in fs quite a bit and we can possibly come up | > with a generic llsc based implementation (w/o the cmpxchg loop) | | May I also suggest changing the return value of set_mask_bits() to old. | | You can compute the new value given old, but you cannot compute the old | value given new, therefore old is the better return value. Also, no | current user seems to use the return value, so changing it is without | risk.
Link: http://lkml.kernel.org/g/20150807110955.gh16...@twins.programming.kicks-ass.net Suggested-by: Peter Zijlstra <pet...@infradead.org> Cc: Miklos Szeredi <mszer...@redhat.com> Cc: Ingo Molnar <mi...@kernel.org> Cc: Jani Nikula <jani.nik...@intel.com> Cc: Chris Wilson <ch...@chris-wilson.co.uk> Cc: Andrew Morton <a...@linux-foundation.org> Reviewed-by: Anthony Yznaga <anthony.yzn...@oracle.com> Acked-by: Will Deacon <will.dea...@arm.com> Signed-off-by: Vineet Gupta <vgu...@synopsys.com> --- include/linux/bitops.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/bitops.h b/include/linux/bitops.h index 705f7c442691..602af23b98c7 100644 --- a/include/linux/bitops.h +++ b/include/linux/bitops.h @@ -246,7 +246,7 @@ static __always_inline void __assign_bit(long nr, volatile unsigned long *addr, new__ = (old__ & ~mask__) | bits__; \ } while (cmpxchg(ptr, old__, new__) != old__); \ \ - new__; \ + old__; \ }) #endif -- 2.7.4 _______________________________________________ linux-snps-arc mailing list linux-snps-arc@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-snps-arc
