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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2017-01-10 16:57:18 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-01-10 18:31:54 -0800
commitd670ffd87509b6b136d8ed6f757851a8ebe442b2 (patch)
tree3c0a12a54869fd87c4e36940f5629d345abcad35 /mm/interval_tree.c
parent965d004af54088d138f806d04d803fb60d441986 (diff)
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mm/thp/pagecache/collapse: free the pte page table on collapse for thp page cache.
With THP page cache, when trying to build a huge page from regular pte pages, we just clear the pmd entry. We will take another fault and at that point we will find the huge page in the radix tree, thereby using the huge page to complete the page fault The second fault path will allocate the needed pgtable_t page for archs like ppc64. So no need to deposit the same in collapse path. Depositing them in the collapse path resulting in a pgtable_t memory leak also giving errors like BUG: non-zero nr_ptes on freeing mm: 3 Fixes: 953c66c2b22a ("mm: THP page cache support for ppc64") Link: http://lkml.kernel.org/r/20161212163428.6780-2-aneesh.kumar@linux.vnet.ibm.com Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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