Commit 544f8f93 authored Apr 17, 2017 by Nitin Gupta Committed by David S. Miller Apr 18, 2017

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>

parent 395102db

arch/sparc/mm/hugetlbpage.c

+16 −0

Original line number	Diff line number	Diff line
		@@ -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);