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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2007-10-16 04:25:44 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 12:42:59 -0400
commit954ffcb35f5aca428661d29b96c4eee82b3c19cd (patch)
tree2dd8aaf26a8ae81b461b6d5d824ae8744690e483 /Documentation
parent97ee052461446526e1de7236497e6f1b1ffedf8c (diff)
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.txt6
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:
133 The ia64 sn2 platform is one example of a platform 133 The ia64 sn2 platform is one example of a platform
134 that uses this interface. 134 that uses this interface.
135 135
1368) void lazy_mmu_prot_update(pte_t pte)
137 This interface is called whenever the protection on
138 any user PTEs change. This interface provides a notification
139 to architecture specific code to take appropriate action.
140
141
142Next, we have the cache flushing interfaces. In general, when Linux 136Next, we have the cache flushing interfaces. In general, when Linux
143is changing an existing virtual-->physical mapping to a new value, 137is changing an existing virtual-->physical mapping to a new value,
144the sequence will be in one of the following forms: 138the sequence will be in one of the following forms: