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Message-Id: <1361919370-18058-1-git-send-email-boris.ostrovsky@oracle.com> Date: Tue, 26 Feb 2013 17:56:10 -0500 From: Boris Ostrovsky <boris.ostrovsky@...cle.com> To: tglx@...utronix.de, mingo@...hat.com, hpa@...or.com Cc: konrad.wilk@...cle.com, xen-devel@...ts.xen.org, linux-kernel@...r.kernel.org, Boris Ostrovsky <boris.ostrovsky@...cle.com> Subject: [PATCH] mm/x86: 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.ostrovsky@...cle.com> --- 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 ca1f1c2..7b3216e 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -1369,6 +1369,8 @@ 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 -- 1.8.1.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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