diff options
| author | Ingo Molnar <mingo@kernel.org> | 2013-11-01 08:10:58 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-11-01 08:24:41 +0100 |
| commit | fb10d5b7efbcc0aa9e46a9aa5ad86772c7bacb9a (patch) | |
| tree | ea284fe7b9c17a85b8d3c4ba999d6e26d51a12f6 /mm/huge_memory.c | |
| parent | f9f9ffc237dd924f048204e8799da74f9ecf40cf (diff) | |
| parent | 52469b4fcd4fc433ffc78cec4cf94368e9052890 (diff) | |
Merge branch 'linus' into sched/core
Resolve cherry-picking conflicts:
Conflicts:
mm/huge_memory.c
mm/memory.c
mm/mprotect.c
See this upstream merge commit for more details:
52469b4fcd4f Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'mm/huge_memory.c')
| -rw-r--r-- | mm/huge_memory.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 1be2a1f95b61..2612f60f53ee 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -2756,6 +2756,7 @@ void __split_huge_page_pmd(struct vm_area_struct *vma, unsigned long address, mmun_start = haddr; mmun_end = haddr + HPAGE_PMD_SIZE; +again: mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end); spin_lock(&mm->page_table_lock); if (unlikely(!pmd_trans_huge(*pmd))) { @@ -2778,7 +2779,14 @@ void __split_huge_page_pmd(struct vm_area_struct *vma, unsigned long address, split_huge_page(page); put_page(page); - BUG_ON(pmd_trans_huge(*pmd)); + + /* + * We don't always have down_write of mmap_sem here: a racing + * do_huge_pmd_wp_page() might have copied-on-write to another + * huge page before our split_huge_page() got the anon_vma lock. + */ + if (unlikely(pmd_trans_huge(*pmd))) + goto again; } void split_huge_page_pmd_mm(struct mm_struct *mm, unsigned long address, |