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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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tejun Heo 2014-08-15 16:06:10 -04:00 committed by Greg Kroah-Hartman
parent 5df644fd60
commit 9afaddd978
1 changed files with 1 additions and 0 deletions
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1
mm/percpu-vm.c
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@ -272,6 +272,7 @@ static int pcpu_map_pages(struct pcpu_chunk *chunk,
__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;
}