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| author |   Hugh Dickins <hugh@veritas.com> | 2005-11-23 13:37:39 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@g5.osdl.org> | 2005-11-23 16:08:38 -0800 |
| commit | 01edcd891c3e9f4bb992ff2ceb69836bf76f8ddf (patch) | |
| tree | 3b8ab4808220d1caaf3ba34db16917f71b852a08 /arch/powerpc/mm/tlb_32.c | |
| parent | [PATCH] mm: unbloat get_futex_key (diff) | |
| download | linux-dev-01edcd891c3e9f4bb992ff2ceb69836bf76f8ddf.tar.xz linux-dev-01edcd891c3e9f4bb992ff2ceb69836bf76f8ddf.zip | |
[PATCH] mm: powerpc ptlock comments
Update comments (only) on page_table_lock and mmap_sem in arch/powerpc.
Removed the comment on page_table_lock from hash_huge_page: since it's no
longer taking page_table_lock itself, it's irrelevant whether others are; but
how it is safe (even against huge file truncation?) I can't say.
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/powerpc/mm/tlb_32.c')
| -rw-r--r-- | arch/powerpc/mm/tlb_32.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/powerpc/mm/tlb_32.c b/arch/powerpc/mm/tlb_32.c index 6c3dc3c44c86..ad580f3742e5 100644 --- a/arch/powerpc/mm/tlb_32.c +++ b/arch/powerpc/mm/tlb_32.c @@ -149,6 +149,12 @@ void flush_tlb_mm(struct mm_struct *mm) return; } + /* + * It is safe to go down the mm's list of vmas when called + * from dup_mmap, holding mmap_sem. It would also be safe from + * unmap_region or exit_mmap, but not from vmtruncate on SMP - + * but it seems dup_mmap is the only SMP case which gets here. + */ for (mp = mm->mmap; mp != NULL; mp = mp->vm_next) flush_range(mp->vm_mm, mp->vm_start, mp->vm_end); FINISH_FLUSH; |