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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2008-12-18 19:13:29 +0000
committerPaul Mackerras <paulus@samba.org>2008-12-21 14:21:15 +1100
commit2ca8cf738907180e7fbda90f25f32b86feda609f (patch)
tree60d8af9b53a78ae9300ef7e68f222b02fe3be542 /include/video
parent5e696617c425eb97bd943d781f3941fb1e8f0e5b (diff)
powerpc/mm: Rework context management for CPUs with no hash table
This reworks the context management code used by 4xx,8xx and freescale BookE. It adds support for SMP by implementing a concept of stale context map to lazily flush the TLB on processors where a context may have been invalidated. This also contains the ground work for generalizing such lazy TLB flushing by just picking up a new PID and marking the old one stale. This will be implemented later. This is a first implementation that uses a global spinlock. Ideally, we should try to get at least the fast path (context ID already assigned) lockless or limited to a per context lock, but for now this will do. I tried to keep the UP case reasonably simple to avoid adding too much overhead to 8xx which does a lot of context stealing since it effectively has only 16 PIDs available. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
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