Commit-ID: 26564600c9e88c6572a5e6ef5ae9121907edfb7f Gitweb: http://git.kernel.org/tip/26564600c9e88c6572a5e6ef5ae9121907edfb7f Author: Boris Ostrovsky <boris.ostrov...@oracle.com> AuthorDate: Thu, 11 Apr 2013 13:59:52 -0400 Committer: Ingo Molnar <mi...@kernel.org> CommitDate: Fri, 12 Apr 2013 07:19:19 +0200
x86/mm: Flush lazy MMU when DEBUG_PAGEALLOC is set When CONFIG_DEBUG_PAGEALLOC is set page table updates made by kernel_map_pages() are not made visible (via TLB flush) immediately if lazy MMU is on. In environments that support lazy MMU (e.g. Xen) this may lead to fatal page faults, for example, when zap_pte_range() needs to allocate pages in __tlb_remove_page() -> tlb_next_batch(). Signed-off-by: Boris Ostrovsky <boris.ostrov...@oracle.com> Cc: konrad.w...@oracle.com Link: http://lkml.kernel.org/r/1365703192-2089-1-git-send-email-boris.ostrov...@oracle.com Signed-off-by: Ingo Molnar <mi...@kernel.org> --- arch/x86/mm/pageattr.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index 7896f71..fb4e73e 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -1413,6 +1413,8 @@ void kernel_map_pages(struct page *page, int numpages, int enable) * but that can deadlock->flush only current cpu: */ __flush_tlb_all(); + + arch_flush_lazy_mmu_mode(); } #ifdef CONFIG_HIBERNATION -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/