diff options
| author | Jerry Hoemann <jerry.hoemann@hp.com> | 2013-04-30 15:15:55 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-05-11 13:48:15 -0700 |
| commit | 94544e2e6ef40c33b760f0c8649904db262dfd64 (patch) | |
| tree | 808d75bf9fa91db463c5ae4a705a235e9b032145 | |
| parent | e4727b26cd5c972a1688e23c877538ccdd5513be (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>
| -rw-r--r-- | arch/x86/mm/init.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c index fae70904ed08..71d37f527c62 100644 --- a/arch/x86/mm/init.c +++ b/arch/x86/mm/init.c @@ -45,11 +45,15 @@ static void __init find_early_table_space(struct map_range *mr, int nr_range) int i; unsigned long puds = 0, pmds = 0, ptes = 0, tables; unsigned long start = 0, good_end; + unsigned long pgd_extra = 0; phys_addr_t base; for (i = 0; i < nr_range; i++) { unsigned long range, extra; + if ((mr[i].end >> PGDIR_SHIFT) - (mr[i].start >> PGDIR_SHIFT)) + pgd_extra++; + range = mr[i].end - mr[i].start; puds += (range + PUD_SIZE - 1) >> PUD_SHIFT; @@ -74,6 +78,7 @@ static void __init find_early_table_space(struct map_range *mr, int nr_range) tables = roundup(puds * sizeof(pud_t), PAGE_SIZE); tables += roundup(pmds * sizeof(pmd_t), PAGE_SIZE); tables += roundup(ptes * sizeof(pte_t), PAGE_SIZE); + tables += (pgd_extra * PAGE_SIZE); #ifdef CONFIG_X86_32 /* for fixmap */ |