On Wed, Dec 06, 2023 at 09:24:03PM -0800, Christoph Hellwig wrote: > On Wed, Dec 06, 2023 at 08:46:29PM +0000, Matthew Wilcox (Oracle) wrote: > > Use folio_fill_tail() and folio_end_read() instead of open-coding them. > > Add a sanity check in case a folio is allocated above index 0. > > Where do these helpers come from? Can't find them in Linus' tree. Is your tree out of date? 0b237047d5a7 for folio_end_read() $ git describe --contains 0b237047d5a7 v6.7-rc1~90^2~161 folio_fill_tail() appears to only be in akpm's tree for now. Looks like it's still in the 'unstable' part for now, so no sha1 for that.