On Mon, Sep 02, 2024 at 03:00:37PM GMT, Matthew Wilcox wrote: > On Mon, Sep 02, 2024 at 02:49:32PM +0200, Pankaj Raghav (Samsung) wrote: > > From: Pankaj Raghav <p.raghav@xxxxxxxxxxx> > > > > Sven reported that a commit from bs > ps series was breaking the ksm ltp > > test[1]. > > > > split_huge_page() takes precisely a page that is locked, and it also > > expects the folio that contains that page to be locked after that > > huge page has been split. The changes introduced converted the page to > > folio, and passed the head page to be split, which might not be locked, > > resulting in a kernel panic. > > > > This commit fixes it by always passing the correct page to be split from > > split_huge_page() with the appropriate minimum order for splitting. > > This should be folded into the patch that is broken, not be a separate > fix commit, otherwise it introduces a bisection hazard which are to be > avoided when possible. Patch folded into "mm: split a folio in minimum folio order chunks" with the Link to this patch. Please double-check.
