Re: [PATCH] xfs: Fix build breakage in xfs_iops.c whenCONFIG_FS_POSIX_ACL is not set

[Linus Torvalds]

On Tue, Jul 26, 2011 at 2:49 AM, Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote:
>
> In that case we might as well just throw it in and try it.  In the worst
> case we'll get one expansion per site that takes the address, but no-acl
> builds aren't really something worth optimizing for.

If ACL's are enabled on a system level, but not in XFS, this is more
than a small optimization. It kills the RCU walk entirely if you just
return NULL without setting the cache.

                       Linus
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