diff options
| author | Paul Mundt <lethal@linux-sh.org> | 2009-08-15 02:21:16 +0900 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2009-08-15 02:21:16 +0900 |
| commit | e7b8b7f16edc9b363573eadf2ab2683473626071 (patch) | |
| tree | f5d578d8d594b09d968d579f000a3f9b03da10a9 /arch/sh/mm | |
| parent | 795687265d1b6f666d02ff56f6c1679a8db160a9 (diff) | |
sh: NO_CONTEXT ASID optimizations for SH-4 cache flush.
This optimizes for the cases when a CPU does not yet have a valid ASID
context associated with it, as in this case there is no work for any of
flush_cache_mm()/flush_cache_page()/flush_cache_range() to do. Based on
the the MIPS implementation.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/mm')
| -rw-r--r-- | arch/sh/mm/cache-sh4.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/sh/mm/cache-sh4.c b/arch/sh/mm/cache-sh4.c index dfc1d037947..92f87a460a8 100644 --- a/arch/sh/mm/cache-sh4.c +++ b/arch/sh/mm/cache-sh4.c @@ -330,6 +330,9 @@ loop_exit: */ void flush_cache_mm(struct mm_struct *mm) { + if (cpu_context(smp_processor_id(), mm) == NO_CONTEXT) + return; + /* * If cache is only 4k-per-way, there are never any 'aliases'. Since * the cache is physically tagged, the data can just be left in there. @@ -371,6 +374,9 @@ void flush_cache_page(struct vm_area_struct *vma, unsigned long address, unsigned long phys = pfn << PAGE_SHIFT; unsigned int alias_mask; + if (cpu_context(smp_processor_id(), vma->vm_mm) == NO_CONTEXT) + return; + alias_mask = boot_cpu_data.dcache.alias_mask; /* We only need to flush D-cache when we have alias */ @@ -413,6 +419,9 @@ void flush_cache_page(struct vm_area_struct *vma, unsigned long address, void flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) { + if (cpu_context(smp_processor_id(), vma->vm_mm) == NO_CONTEXT) + return; + /* * If cache is only 4k-per-way, there are never any 'aliases'. Since * the cache is physically tagged, the data can just be left in there. |