diff options
author | Hugh Dickins <hugh@veritas.com> | 2006-10-31 18:41:51 +0000 |
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committer | Paul Mackerras <paulus@samba.org> | 2006-11-01 14:52:49 +1100 |
commit | 292f86f005e3867277b2126c2399eea3e773a4fc (patch) | |
tree | 12a7040e81b80f87f4c0899b94dd8bd29c1df391 /.gitignore | |
parent | 96268889ee369b36203b7a06e8aabb197270216e (diff) |
[POWERPC] Make mmiowb's io_sync preempt safe
If mmiowb() is always used prior to releasing spinlock as Doc suggests,
then it's safe against preemption; but I'm not convinced that's always
the case. If preemption occurs between sync and get_paca()->io_sync = 0,
I believe there's no problem. But in the unlikely event that gcc does
the store relative to another register than r13 (as it did with current),
then there's a small danger of setting another cpu's io_sync to 0, after
it had just set it to 1. Rewrite ppc64 mmiowb to prevent that.
The remaining io_sync assignments in io.h all get_paca()->io_sync = 1,
which is harmless even if preempted to the wrong cpu (the context switch
itself syncs); and those in spinlock.h are while preemption is disabled.
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to '.gitignore')
0 files changed, 0 insertions, 0 deletions