diff options
| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2008-12-18 19:13:29 +0000 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2008-12-21 14:21:15 +1100 |
| commit | 2ca8cf738907180e7fbda90f25f32b86feda609f (patch) | |
| tree | 60d8af9b53a78ae9300ef7e68f222b02fe3be542 /arch/powerpc/include/asm/mmu-40x.h | |
| parent | 5e696617c425eb97bd943d781f3941fb1e8f0e5b (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>
Diffstat (limited to 'arch/powerpc/include/asm/mmu-40x.h')
| -rw-r--r-- | arch/powerpc/include/asm/mmu-40x.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/powerpc/include/asm/mmu-40x.h b/arch/powerpc/include/asm/mmu-40x.h index 3d108676584..776f415a36a 100644 --- a/arch/powerpc/include/asm/mmu-40x.h +++ b/arch/powerpc/include/asm/mmu-40x.h @@ -54,8 +54,9 @@ #ifndef __ASSEMBLY__ typedef struct { - unsigned long id; - unsigned long vdso_base; + unsigned int id; + unsigned int active; + unsigned long vdso_base; } mm_context_t; #endif /* !__ASSEMBLY__ */ |