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author | Hugh Dickins <hugh@veritas.com> | 2005-10-29 18:16:24 -0700 |
---|---|---|
committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-10-29 21:40:40 -0700 |
commit | b462705ac679f6195d1b23a752cda592d9107495 (patch) | |
tree | c4d9be08f67b0ffdc66c3e170614bd03945f3c42 /arch/arm | |
parent | c74df32c724a1652ad8399b4891bb02c9d43743a (diff) | |
download | linux-b462705ac679f6195d1b23a752cda592d9107495.tar.gz linux-b462705ac679f6195d1b23a752cda592d9107495.tar.bz2 linux-b462705ac679f6195d1b23a752cda592d9107495.zip |
[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/arm')
-rw-r--r-- | arch/arm/mm/mm-armv.c | 14 |
1 files changed, 0 insertions, 14 deletions
diff --git a/arch/arm/mm/mm-armv.c b/arch/arm/mm/mm-armv.c index 61bc2fa0511e..60f3e039bac2 100644 --- a/arch/arm/mm/mm-armv.c +++ b/arch/arm/mm/mm-armv.c @@ -180,11 +180,6 @@ pgd_t *get_pgd_slow(struct mm_struct *mm) if (!vectors_high()) { /* - * This lock is here just to satisfy pmd_alloc and pte_lock - */ - spin_lock(&mm->page_table_lock); - - /* * On ARM, first page must always be allocated since it * contains the machine vectors. */ @@ -201,23 +196,14 @@ pgd_t *get_pgd_slow(struct mm_struct *mm) set_pte(new_pte, *init_pte); pte_unmap_nested(init_pte); pte_unmap(new_pte); - - spin_unlock(&mm->page_table_lock); } return new_pgd; no_pte: - spin_unlock(&mm->page_table_lock); pmd_free(new_pmd); - free_pages((unsigned long)new_pgd, 2); - return NULL; - no_pmd: - spin_unlock(&mm->page_table_lock); free_pages((unsigned long)new_pgd, 2); - return NULL; - no_pgd: return NULL; } |