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sparc64: Fix hugepage page table free 

Make sure the start adderess is aligned to PMD_SIZE
boundary when freeing page table backing a hugepage
region. The issue was causing segfaults when a region
backed by 64K pages was unmapped since such a region
is in general not PMD_SIZE aligned.

Signed-off-by: Nitin Gupta <nitin.m.gupta@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Nitin Gupta 2017-04-17 15:46:41 -07:00 committed by David S. Miller
parent 395102db44
commit 544f8f9358
1 changed files with 16 additions and 0 deletions
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16
arch/sparc/mm/hugetlbpage.c
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@ -461,6 +461,22 @@ void hugetlb_free_pgd_range(struct mmu_gather *tlb,
pgd_t *pgd;
unsigned long next;
addr &= PMD_MASK;
if (addr < floor) {
addr += PMD_SIZE;
if (!addr)
return;
}
if (ceiling) {
ceiling &= PMD_MASK;
if (!ceiling)
return;
}
if (end - 1 > ceiling - 1)
end -= PMD_SIZE;
if (addr > end - 1)
return;
pgd = pgd_offset(tlb->mm, addr);
do {
next = pgd_addr_end(addr, end);