Re: [PATCH] fs: inode_set_flags() replace opencoded set_mask_bits()

[Vineet Gupta]

On Friday 07 August 2015 04:40 PM, Peter Zijlstra wrote:
> On Fri, Aug 07, 2015 at 12:25:04PM +0530, Vineet Gupta wrote:
>> > It seems that 5f16f3225b0624 and 00a1a053ebe5, both with same commitlog
>> > ("ext4: atomically set inode->i_flags in ext4_set_inode_flags()")
>> > introduced the set_mask_bits API, but somehow missed not using it in
>> > ext4 in the end
>> > 
>> > 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.

Makes sense - will do that early next week !
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