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authorJerry Hoemann <jerry.hoemann@hp.com>2013-04-30 15:15:55 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-05-11 13:48:15 -0700
commit94544e2e6ef40c33b760f0c8649904db262dfd64 (patch)
tree808d75bf9fa91db463c5ae4a705a235e9b032145 /Makefile
parente4727b26cd5c972a1688e23c877538ccdd5513be (diff)
x86/mm: account for PGDIR_SIZE alignment
Patch for -stable. Function find_early_table_space removed upstream. Fixes panic in alloc_low_page due to pgt_buf overflow during init_memory_mapping. find_early_table_space sizes pgt_buf based upon the size of the memory being mapped, but it does not take into account the alignment of the memory. When the region being mapped spans a 512GB (PGDIR_SIZE) alignment, a panic from alloc_low_pages occurs. kernel_physical_mapping_init takes into account PGDIR_SIZE alignment. This causes an extra call to alloc_low_page to be made. This extra call isn't accounted for by find_early_table_space and causes a kernel panic. Change is to take into account PGDIR_SIZE alignment in find_early_table_space. Signed-off-by: Jerry Hoemann <jerry.hoemann@hp.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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