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authorTejun Heo <tj@kernel.org>2009-06-22 11:56:23 +0900
committerTejun Heo <tj@kernel.org>2009-06-22 11:56:23 +0900
commit85ae87c1ad8e18a421e7448a99a42ecda183f29f (patch)
tree8fcf3fe5bc9a96a1c16244950d944d4a4e7130c5
parentf234012f52a37e48f2330e1ca2df69800e797c3b (diff)
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op-kernel-dev-85ae87c1ad8e18a421e7448a99a42ecda183f29f.tar.gz
percpu: fix too lazy vunmap cache flushing
In pcpu_unmap(), flushing virtual cache on vunmap can't be delayed as the page is going to be returned to the page allocator. Only TLB flushing can be put off such that vmalloc code can handle it lazily. Fix it. [ Impact: fix subtle virtual cache flush bug ] Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Nick Piggin <npiggin@suse.de> Cc: Ingo Molnar <mingo@elte.hu>
-rw-r--r--mm/percpu.c11
1 files changed, 5 insertions, 6 deletions
diff --git a/mm/percpu.c b/mm/percpu.c
index c0b2c1a..d06f474 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -549,14 +549,14 @@ static void pcpu_free_area(struct pcpu_chunk *chunk, int freeme)
* @chunk: chunk of interest
* @page_start: page index of the first page to unmap
* @page_end: page index of the last page to unmap + 1
- * @flush: whether to flush cache and tlb or not
+ * @flush_tlb: whether to flush tlb or not
*
* For each cpu, unmap pages [@page_start,@page_end) out of @chunk.
* If @flush is true, vcache is flushed before unmapping and tlb
* after.
*/
static void pcpu_unmap(struct pcpu_chunk *chunk, int page_start, int page_end,
- bool flush)
+ bool flush_tlb)
{
unsigned int last = num_possible_cpus() - 1;
unsigned int cpu;
@@ -569,9 +569,8 @@ static void pcpu_unmap(struct pcpu_chunk *chunk, int page_start, int page_end,
* the whole region at once rather than doing it for each cpu.
* This could be an overkill but is more scalable.
*/
- if (flush)
- flush_cache_vunmap(pcpu_chunk_addr(chunk, 0, page_start),
- pcpu_chunk_addr(chunk, last, page_end));
+ flush_cache_vunmap(pcpu_chunk_addr(chunk, 0, page_start),
+ pcpu_chunk_addr(chunk, last, page_end));
for_each_possible_cpu(cpu)
unmap_kernel_range_noflush(
@@ -579,7 +578,7 @@ static void pcpu_unmap(struct pcpu_chunk *chunk, int page_start, int page_end,
(page_end - page_start) << PAGE_SHIFT);
/* ditto as flush_cache_vunmap() */
- if (flush)
+ if (flush_tlb)
flush_tlb_kernel_range(pcpu_chunk_addr(chunk, 0, page_start),
pcpu_chunk_addr(chunk, last, page_end));
}
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