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authorJerry Hoemann2013-04-30 16:15:55 -0500
committerGreg Kroah-Hartman2013-05-11 15:54:11 -0500
commit34660a13cda790e62bac8229b15317007cea247a (patch)
tree2caf0ae3070e778d5709a34bff55916593fbc575 /Documentation
parentfccd6eb97dab4cf45b2cda8278d5a7582cd40d08 (diff)
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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>
Diffstat (limited to 'Documentation')
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