Commit 3dc90795 authored Sep 30, 2006 by Zachary Amsden Committed by Linus Torvalds Oct 01, 2006

[PATCH] paravirt: remove read hazard from cow

We don't want to read PTEs directly like this after they have been modified,
as a lazy MMU implementation of direct page tables may not have written the
updated PTE back to memory yet.

Signed-off-by: Zachary Amsden <zach@vmware.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

parent bd4c8ce4

mm/memory.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -467,7 +467,7 @@ copy_one_pte(struct mm_struct dst_mm, struct mm_struct src_mm,
		*/
		if (is_cow_mapping(vm_flags)) {
		ptep_set_wrprotect(src_mm, addr, src_pte);
		pte = *src_pte;
		pte = pte_wrprotect(pte);
		}

		/*

Admin message