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| author | Hugh Dickins <hugh@veritas.com> | 2005-10-30 04:16:24 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-10-30 07:40:40 +0300 |
| commit | b462705ac679f6195d1b23a752cda592d9107495 (patch) | |
| tree | c4d9be08f67b0ffdc66c3e170614bd03945f3c42 /arch/sparc | |
| parent | c74df32c724a1652ad8399b4891bb02c9d43743a (diff) | |
| download | linux-b462705ac679f6195d1b23a752cda592d9107495.tar.xz | |
[PATCH] mm: arches skip ptlock
Convert those few architectures which are calling pud_alloc, pmd_alloc,
pte_alloc_map on a user mm, not to take the page_table_lock first, nor drop it
after. Each of these can continue to use pte_alloc_map, no need to change
over to pte_alloc_map_lock, they're neither racy nor swappable.
In the sparc64 io_remap_pfn_range, flush_tlb_range then falls outside of the
page_table_lock: that's okay, on sparc64 it's like flush_tlb_mm, and that has
always been called from outside of page_table_lock in dup_mmap.
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 'arch/sparc')
| -rw-r--r-- | arch/sparc/mm/generic.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/arch/sparc/mm/generic.c b/arch/sparc/mm/generic.c index 659c9a71f867..9604893ffdbd 100644 --- a/arch/sparc/mm/generic.c +++ b/arch/sparc/mm/generic.c @@ -81,9 +81,8 @@ int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from, dir = pgd_offset(mm, from); flush_cache_range(vma, beg, end); - spin_lock(&mm->page_table_lock); while (from < end) { - pmd_t *pmd = pmd_alloc(current->mm, dir, from); + pmd_t *pmd = pmd_alloc(mm, dir, from); error = -ENOMEM; if (!pmd) break; @@ -93,7 +92,6 @@ int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from, from = (from + PGDIR_SIZE) & PGDIR_MASK; dir++; } - spin_unlock(&mm->page_table_lock); flush_tlb_range(vma, beg, end); return error; |