On Mon, Jan 10, 2022 at 04:23:46AM +0000, Matthew Wilcox (Oracle) wrote: > If we hit the page split race, the current code returns NULL which will > presumably trigger a retry under the mmap_lock. This isn't necessary; > we can just retry the compound_head() lookup. This is a very minor > optimisation of an unlikely path, but conceptually it matches (eg) > the page cache RCU-protected lookup. > > Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx> Looks good, Reviewed-by: Christoph Hellwig <hch@xxxxxx>
