From: NIIBE Yutaka <gniibe@chroot.org>
Date: Fri, 21 Jul 2000 12:57:26 +0900
SH-4 has virtually indexed and physically tagged cache, which has
alias problem to be handled by kernel. When process exits, we need
to flush the caches used by the process. If we don't do flush
here, something wrong will be happened later, because of cache
aliases, when the pages will be reused. The page will be polluted
by old cache data in unrelated way.
Can you show me a call path to exit_mmap which does not satisfy one of
the following two cases?
1) Some function higher in the call path to exit_mmap performs
a flush_cache_mm/flush_tlb_mm sequence.
2) It is known that the mm whose address space is being torn down by
exit_mmap has never executed ever on a cpu (ie. how kernel/fork.c
invokes mmput() for error recovery).
If you cannot, I really prefer that this change not go in, because it
means that you honestly have a bug somewhere else, perhaps in your
flush_cache_mm implementation.
Later,
David S. Miller
davem@redhat.com
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