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percpu: perform tlb flush after pcpu_map_pages() failure

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commit 849f516909 upstream.

If pcpu_map_pages() fails midway, it unmaps the already mapped pages.
Currently, it doesn't flush tlb after the partial unmapping.  This may
be okay in most cases as the established mapping hasn't been used at
that point but it can go wrong and when it goes wrong it'd be
extremely difficult to track down.

Flush tlb after the partial unmapping.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Zefan Li <lizefan@huawei.com>
This commit is contained in:
Tejun Heo 2014-08-15 16:06:10 -04:00 committed by Zefan Li
parent 240269ae89
commit bd188dc72d
1 changed files with 1 additions and 0 deletions
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mm/percpu-vm.c
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@ -272,6 +272,7 @@ err:
__pcpu_unmap_pages(pcpu_chunk_addr(chunk, tcpu, page_start),
page_end - page_start);
}
pcpu_post_unmap_tlb_flush(chunk, page_start, page_end);
return err;
}