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[PATCH] Optimize D-cache alias handling on fork

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Virtually index, physically tagged cache architectures can get away
without cache flushing when forking.  This patch adds a new cache
flushing function flush_cache_dup_mm(struct mm_struct *) which for the
moment I've implemented to do the same thing on all architectures
except on MIPS where it's a no-op.

Signed-off-by: Ralf Baechle <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Ralf Baechle 2006-12-12 17:14:57 +00:00 • committed by Linus Torvalds
commit ec8c0446b6
27 changed files with 54 additions and 7 deletions
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1
include/asm-sparc64/cacheflush.h
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@ -12,6 +12,7 @@
/* These are the same regardless of whether this is an SMP kernel or not. */
#define flush_cache_mm(__mm) \
do { if ((__mm) == current->mm) flushw_user(); } while(0)
#define flush_cache_dup_mm(mm) flush_cache_mm(mm)
#define flush_cache_range(vma, start, end) \
flush_cache_mm((vma)->vm_mm)
#define flush_cache_page(vma, page, pfn) \