Commit 26564600 authored by Boris Ostrovsky's avatar Boris Ostrovsky Committed by Ingo Molnar

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: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: konrad.wilk@oracle.com
Link: http://lkml.kernel.org/r/1365703192-2089-1-git-send-email-boris.ostrovsky@oracle.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 18699739
...@@ -1413,6 +1413,8 @@ void kernel_map_pages(struct page *page, int numpages, int enable) ...@@ -1413,6 +1413,8 @@ void kernel_map_pages(struct page *page, int numpages, int enable)
* but that can deadlock->flush only current cpu: * but that can deadlock->flush only current cpu:
*/ */
__flush_tlb_all(); __flush_tlb_all();
arch_flush_lazy_mmu_mode();
} }
#ifdef CONFIG_HIBERNATION #ifdef CONFIG_HIBERNATION
......
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