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authorZachary Amsden <zach@vmware.com>2007-04-08 19:04:01 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-04-08 22:47:55 -0400
commit49f19710512c825aaea73b9207b3a848027cda1d (patch)
tree06da31bd9a84273e12aa43f536f90eb8146ff92e /include/asm-generic
parenta5bfffac645a7b2d8119f8bbae34df5c94832799 (diff)
[PATCH] Proper fix for highmem kmap_atomic functions for VMI for 2.6.21
Since lazy MMU batching mode still allows interrupts to enter, it is possible for interrupt handlers to try to use kmap_atomic, which fails when lazy mode is active, since the PTE update to highmem will be delayed. The best workaround is to issue an explicit flush in kmap_atomic_functions case; this is the only way nested PTE updates can happen in the interrupt handler. Thanks to Jeremy Fitzhardinge for noting the bug and suggestions on a fix. This patch gets reverted again when we start 2.6.22 and the bug gets fixed differently. Signed-off-by: Zachary Amsden <zach@vmware.com> Cc: Andi Kleen <ak@muc.de> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-generic')
-rw-r--r--include/asm-generic/pgtable.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index 00c23433b39f..6d7e279b1490 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -180,6 +180,7 @@ static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addres
180#ifndef __HAVE_ARCH_ENTER_LAZY_MMU_MODE 180#ifndef __HAVE_ARCH_ENTER_LAZY_MMU_MODE
181#define arch_enter_lazy_mmu_mode() do {} while (0) 181#define arch_enter_lazy_mmu_mode() do {} while (0)
182#define arch_leave_lazy_mmu_mode() do {} while (0) 182#define arch_leave_lazy_mmu_mode() do {} while (0)
183#define arch_flush_lazy_mmu_mode() do {} while (0)
183#endif 184#endif
184 185
185/* 186/*
@@ -193,6 +194,7 @@ static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addres
193#ifndef __HAVE_ARCH_ENTER_LAZY_CPU_MODE 194#ifndef __HAVE_ARCH_ENTER_LAZY_CPU_MODE
194#define arch_enter_lazy_cpu_mode() do {} while (0) 195#define arch_enter_lazy_cpu_mode() do {} while (0)
195#define arch_leave_lazy_cpu_mode() do {} while (0) 196#define arch_leave_lazy_cpu_mode() do {} while (0)
197#define arch_flush_lazy_cpu_mode() do {} while (0)
196#endif 198#endif
197 199
198/* 200/*