From: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Date: Thu, 21 Nov 2013 22:32:09 +0000 (-0800)
Subject: x86, mm: do not leak page->ptl for pmd page tables
X-Git-Tag: v3.13-rc1~17^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c283610e44ec4ccc412dde8b71cf297ed9515f2f;p=pandora-kernel.git

x86, mm: do not leak page->ptl for pmd page tables

There are two code paths how page with pmd page table can be freed:
pmd_free() and pmd_free_tlb().

I've missed the second one and didn't add page table destructor call
there.  It leads to leak of page->ptl for pmd page tables, if
dynamically allocated page->ptl is in use.

The patch adds the missed destructor and modifies documentation
accordingly.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reported-by: Andrey Vagin <avagin@openvz.org>
Tested-by: Andrey Vagin <avagin@openvz.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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