On Thu, 20 Aug 2015 15:31:07 +0300 "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx> wrote: > On Wed, Aug 19, 2015 at 12:21:41PM +0300, Kirill A. Shutemov wrote: > > Here's my attempt on fixing recently discovered race in compound_head(). > > It should make compound_head() reliable in all contexts. > > > > The patchset is against Linus' tree. Let me know if it need to be rebased > > onto different baseline. > > > > It's expected to have conflicts with my page-flags patchset and probably > > should be applied before it. > > > > v3: > > - Fix build without hugetlb; > > - Drop page->first_page; > > - Update comment for free_compound_page(); > > - Use 'unsigned int' for page order; > > > > v2: Per Hugh's suggestion page->compound_head is moved into third double > > word. This way we can avoid memory overhead which v1 had in some > > cases. > > > > This place in struct page is rather overloaded. More testing is > > required to make sure we don't collide with anyone. > > Andrew, can we have the patchset applied, if nobody has objections? I've been hoping to hear from Hugh and I wasn't planning on processing these before the 4.2 release. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>