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author | Hugh Dickins <hugh@veritas.com> | 2005-10-29 18:16:30 -0700 |
---|---|---|
committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-10-29 21:40:41 -0700 |
commit | 508034a32b819a2d40aa7ac0dbc8cd2e044c2de6 (patch) | |
tree | 906a8f0095af24f403b30d649d3ec1ffb4ff2f50 /mm/hugetlb.c | |
parent | 8f4f8c164cb4af1432cc25eda82928ea4519ba72 (diff) | |
download | kernel_samsung_smdk4412-508034a32b819a2d40aa7ac0dbc8cd2e044c2de6.zip kernel_samsung_smdk4412-508034a32b819a2d40aa7ac0dbc8cd2e044c2de6.tar.gz kernel_samsung_smdk4412-508034a32b819a2d40aa7ac0dbc8cd2e044c2de6.tar.bz2 |
[PATCH] mm: unmap_vmas with inner ptlock
Remove the page_table_lock from around the calls to unmap_vmas, and replace
the pte_offset_map in zap_pte_range by pte_offset_map_lock: all callers are
now safe to descend without page_table_lock.
Don't attempt fancy locking for hugepages, just take page_table_lock in
unmap_hugepage_range. Which makes zap_hugepage_range, and the hugetlb test in
zap_page_range, redundant: unmap_vmas calls unmap_hugepage_range anyway. Nor
does unmap_vmas have much use for its mm arg now.
The tlb_start_vma and tlb_end_vma in unmap_page_range are now called without
page_table_lock: if they're implemented at all, they typically come down to
flush_cache_range (usually done outside page_table_lock) and flush_tlb_range
(which we already audited for the mprotect case).
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/hugetlb.c')
-rw-r--r-- | mm/hugetlb.c | 12 |
1 files changed, 3 insertions, 9 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index ea0826f..f29b7dc 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -314,6 +314,8 @@ void unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start, BUG_ON(start & ~HPAGE_MASK); BUG_ON(end & ~HPAGE_MASK); + spin_lock(&mm->page_table_lock); + /* Update high watermark before we lower rss */ update_hiwater_rss(mm); @@ -333,17 +335,9 @@ void unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start, put_page(page); add_mm_counter(mm, file_rss, (int) -(HPAGE_SIZE / PAGE_SIZE)); } - flush_tlb_range(vma, start, end); -} -void zap_hugepage_range(struct vm_area_struct *vma, - unsigned long start, unsigned long length) -{ - struct mm_struct *mm = vma->vm_mm; - - spin_lock(&mm->page_table_lock); - unmap_hugepage_range(vma, start, start + length); spin_unlock(&mm->page_table_lock); + flush_tlb_range(vma, start, end); } int hugetlb_prefault(struct address_space *mapping, struct vm_area_struct *vma) |