ARM: I-cache: avoid flushing in flush_cache_mm()

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flush_cache_mm() is called in two cases:
1. when a process exits, just before the page tables are torn down.
   We can allow the stale lines to evict themselves over time without
   causing any harm.

2. when a process forks, and we've allocated a new ASID.
   The instruction cache issues are dealt with as pages are brought
   into the new process address space.  Flushing the I-cache here is
   therefore unnecessary.

However, we must keep the VIPT aliasing D-cache flush to ensure that
any dirty cache lines are not written back after the pages have been
reallocated for some other use - which would result in corruption.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

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Russell King 2009-10-25 14:31:40 +00:00

parent 9e95922b10

commit ea201dbb78

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arch/arm/mm/flush.c

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