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| author | KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> | 2007-10-16 10:25:44 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-16 18:42:59 +0200 |
| commit | 954ffcb35f5aca428661d29b96c4eee82b3c19cd (patch) | |
| tree | 2dd8aaf26a8ae81b461b6d5d824ae8744690e483 /Documentation | |
| parent | flush cache before installing new page at migraton (diff) | |
| download | linux-954ffcb35f5aca428661d29b96c4eee82b3c19cd.tar.xz linux-954ffcb35f5aca428661d29b96c4eee82b3c19cd.zip | |
flush icache before set_pte() on ia64: flush icache at set_pte
Current ia64 kernel flushes icache by lazy_mmu_prot_update() *after*
set_pte(). This is too late. This patch removes lazy_mmu_prot_update and
add modfied set_pte() for flushing if necessary.
This patch flush icache of a page when
new pte has exec bit.
&& new pte has present bit
&& new pte is user's page.
&& (old *ptep is not present
|| new pte's pfn is not same to old *ptep's ptn)
&& new pte's page has no Pg_arch_1 bit.
Pg_arch_1 is set when a page is cache consistent.
I think this condition checks are much easier to understand than considering
"Where sync_icache_dcache() should be inserted ?".
pte_user() for ia64 was removed by http://lkml.org/lkml/2007/6/12/67 as
clean-up. So, I added it again.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/cachetlb.txt | 6 |
1 files changed, 0 insertions, 6 deletions
diff --git a/Documentation/cachetlb.txt b/Documentation/cachetlb.txt index 866b76139420..552cabac0608 100644 --- a/Documentation/cachetlb.txt +++ b/Documentation/cachetlb.txt @@ -133,12 +133,6 @@ changes occur: The ia64 sn2 platform is one example of a platform that uses this interface. -8) void lazy_mmu_prot_update(pte_t pte) - This interface is called whenever the protection on - any user PTEs change. This interface provides a notification - to architecture specific code to take appropriate action. - - Next, we have the cache flushing interfaces. In general, when Linux is changing an existing virtual-->physical mapping to a new value, the sequence will be in one of the following forms: |