diff options
| author | Nitin Gupta <nitin.m.gupta@oracle.com> | 2017-04-17 15:46:41 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-04-18 13:11:07 -0700 |
| commit | 544f8f935863c5a9ca3e34306ea3316095e7b7bf (patch) | |
| tree | 2447f4641b6a4cfec7600b168b95421343ff2de6 /arch | |
| parent | 395102db441abb8fd18fec5dd81428b5120232af (diff) | |
| download | linux-0-day-544f8f935863c5a9ca3e34306ea3316095e7b7bf.tar.gz linux-0-day-544f8f935863c5a9ca3e34306ea3316095e7b7bf.tar.xz | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/sparc/mm/hugetlbpage.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/sparc/mm/hugetlbpage.c b/arch/sparc/mm/hugetlbpage.c index ee5273ad918de..7c29d38e6b99c 100644 --- a/arch/sparc/mm/hugetlbpage.c +++ b/arch/sparc/mm/hugetlbpage.c @@ -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); |