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authorHugh Dickins <hugh@veritas.com>2005-10-29 18:16:24 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-10-29 21:40:40 -0700
commitb462705ac679f6195d1b23a752cda592d9107495 (patch)
treec4d9be08f67b0ffdc66c3e170614bd03945f3c42 /arch/arm26/mm
parentc74df32c724a1652ad8399b4891bb02c9d43743a (diff)
[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/arm26/mm')
-rw-r--r--arch/arm26/mm/memc.c15
1 files changed, 0 insertions, 15 deletions
diff --git a/arch/arm26/mm/memc.c b/arch/arm26/mm/memc.c
index d6b008b8db7..34def6397c3 100644
--- a/arch/arm26/mm/memc.c
+++ b/arch/arm26/mm/memc.c
@@ -79,12 +79,6 @@ pgd_t *get_pgd_slow(struct mm_struct *mm)
goto no_pgd;
/*
- * This lock is here just to satisfy pmd_alloc and pte_lock
- * FIXME: I bet we could avoid taking it pretty much altogether
- */
- spin_lock(&mm->page_table_lock);
-
- /*
* On ARM, first page must always be allocated since it contains
* the machine vectors.
*/
@@ -113,23 +107,14 @@ pgd_t *get_pgd_slow(struct mm_struct *mm)
memcpy(new_pgd + FIRST_KERNEL_PGD_NR, init_pgd + FIRST_KERNEL_PGD_NR,
(PTRS_PER_PGD - FIRST_KERNEL_PGD_NR) * sizeof(pgd_t));
- spin_unlock(&mm->page_table_lock);
-
/* update MEMC tables */
cpu_memc_update_all(new_pgd);
return new_pgd;
no_pte:
- spin_unlock(&mm->page_table_lock);
pmd_free(new_pmd);
- free_pgd_slow(new_pgd);
- return NULL;
-
no_pmd:
- spin_unlock(&mm->page_table_lock);
free_pgd_slow(new_pgd);
- return NULL;
-
no_pgd:
return NULL;
}