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[PATCH] hugepage: Fix hugepage logic in free_pgtables() harder 

Turns out the hugepage logic in free_pgtables() was doubly broken.  The
loop coalescing multiple normal page VMAs into one call to free_pgd_range()
had an off by one error, which could mean it would coalesce one hugepage
VMA into the same bundle (checking 'vma' not 'next' in the loop).  I
transferred this bug into the new is_vm_hugetlb_page() based version.
Here's the fix.

This one didn't bite on powerpc previously for the same reason the
is_hugepage_only_range() problem didn't: powerpc's hugetlb_free_pgd_range()
is identical to free_pgd_range().  It didn't bite on ia64 because the
hugepage region is distant enough from any other region that the separated
PMD_SIZE distance test would always prevent coalescing the two together.

No libhugetlbfs testsuite regressions (ppc64, POWER5).

Signed-off-by: David Gibson <dwg@au1.ibm.com>
Cc: William Lee Irwin III <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
David Gibson 2006-03-22 00:08:58 -08:00 committed by Linus Torvalds
parent 9da61aef0f
commit 4866920b93
1 changed files with 1 additions and 1 deletions
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2
mm/memory.c
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@ -285,7 +285,7 @@ void free_pgtables(struct mmu_gather **tlb, struct vm_area_struct *vma,
* Optimization: gather nearby vmas into one call down * Optimization: gather nearby vmas into one call down
*/ */
while (next && next->vm_start <= vma->vm_end + PMD_SIZE while (next && next->vm_start <= vma->vm_end + PMD_SIZE
&& !is_vm_hugetlb_page(vma)) { && !is_vm_hugetlb_page(next)) {
vma = next; vma = next;
next = vma->vm_next; next = vma->vm_next;
anon_vma_unlink(vma); anon_vma_unlink(vma);