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authorHugh Dickins <hugh@veritas.com>2006-10-31 18:40:39 +0000
committerPaul Mackerras <paulus@samba.org>2006-11-01 14:52:48 +1100
commit96268889ee369b36203b7a06e8aabb197270216e (patch)
tree90e6553e23ebd4c23b3e39a90d9cb70bc691e7aa
parent5fe8e8b88e68e517637e3f8287f1fee89e2d9252 (diff)
[POWERPC] Make high hugepage areas preempt safe
Checking source for other get_paca()->field preemption dangers found that open_high_hpage_areas does a structure copy into its paca while preemption is enabled: unsafe however gcc accomplishes it. Just remove that copy: it's done safely afterwards by on_each_cpu, as in open_low_hpage_areas. Signed-off-by: Hugh Dickins <hugh@veritas.com> Acked-by: David Gibson <dwg@au1.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
-rw-r--r--arch/powerpc/mm/hugetlbpage.c3
1 files changed, 0 insertions, 3 deletions
diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index 5615acc2952..fd68b74c07c 100644
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -480,9 +480,6 @@ static int open_high_hpage_areas(struct mm_struct *mm, u16 newareas)
mm->context.high_htlb_areas |= newareas;
- /* update the paca copy of the context struct */
- get_paca()->context = mm->context;
-
/* the context change must make it to memory before the flush,
* so that further SLB misses do the right thing. */
mb();