Commit 96268889 authored by Hugh Dickins's avatar Hugh Dickins Committed by Paul Mackerras

[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: default avatarHugh Dickins <hugh@veritas.com>
Acked-by: default avatarDavid Gibson <dwg@au1.ibm.com>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent 5fe8e8b8
......@@ -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();
......
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