diff options
author | Russell King <rmk+kernel@arm.linux.org.uk> | 2009-10-25 14:31:40 +0000 |
---|---|---|
committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2009-12-04 14:58:51 +0000 |
commit | ea201dbb78651c71c56e440b8b3132906bc7456d (patch) | |
tree | 53fa8679229960bb585766c5b49301dee834bcec /arch/arm/mm/flush.c | |
parent | 9e95922b1016ac941db7edcf6b6088b3c2e916c8 (diff) | |
download | op-kernel-dev-ea201dbb78651c71c56e440b8b3132906bc7456d.zip op-kernel-dev-ea201dbb78651c71c56e440b8b3132906bc7456d.tar.gz |
ARM: I-cache: avoid flushing in flush_cache_mm()
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>
Diffstat (limited to 'arch/arm/mm/flush.c')
-rw-r--r-- | arch/arm/mm/flush.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/arm/mm/flush.c b/arch/arm/mm/flush.c index 9770e27..f8feb5d 100644 --- a/arch/arm/mm/flush.c +++ b/arch/arm/mm/flush.c @@ -50,7 +50,6 @@ void flush_cache_mm(struct mm_struct *mm) : : "r" (0) : "cc"); - __flush_icache_all(); } } |