Commit 8b14cb99 authored Aug 21, 2007 by Zachary Amsden Committed by Linus Torvalds Aug 22, 2007

Fix lazy mode vmalloc synchronization for paravirt



Touching vmalloc memory in the middle of a lazy mode update can generate
a kernel PDE update, which must be flushed immediately.  The fix is to
leave lazy mode when doing a vmalloc sync.

Signed-off-by: Zachary Amsden <zach@vmware.com>
Acked-by: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent cb00e99c

arch/i386/mm/fault.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -249,9 +249,10 @@ static inline pmd_t vmalloc_sync_one(pgd_t pgd, unsigned long address)
		pmd_k = pmd_offset(pud_k, address);
		if (!pmd_present(*pmd_k))
		return NULL;
		if (!pmd_present(*pmd))
		if (!pmd_present(*pmd)) {
		set_pmd(pmd, *pmd_k);
		else
		arch_flush_lazy_mmu_mode();
		} else
		BUG_ON(pmd_page(pmd) != pmd_page(pmd_k));
		return pmd_k;
		}