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>

1 files changed, 0 insertions, 1 deletions

diff --git a/mm/mprotect.c b/mm/mprotect.c
index e8346c30abe..1d4d69790e5 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -53,7 +53,6 @@ static void change_pte_range(struct mm_struct *mm, pmd_t *pmd,
                         if (dirty_accountable && pte_dirty(ptent))
                                 ptent = pte_mkwrite(ptent);
                         set_pte_at(mm, addr, pte, ptent);
-                        lazy_mmu_prot_update(ptent);
 #ifdef CONFIG_MIGRATION
                 } else if (!pte_file(oldpte)) {
                         swp_entry_t entry = pte_to_swp_entry(oldpte);