x86/mm: account for PGDIR_SIZE alignment

Patch for 3.0-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: Ben Hutchings <ben@decadent.org.uk>

diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index 34a7f40..a4cca06 100644 (file)
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -44,11 +44,15 @@ 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;
 
@@ -73,6 +77,7 @@ 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 */