This is updated version.
Andrew, could you repleace ?
-Kame
==
Fixing 2 small issues pointed by Tony Luck.
Changelog v1 -> v2
* add pte_present_exec_user()
* remove pte_user
* fixed comments.
v1.
* removing redundant BUG_ON in __ia64_sync_icache_dcache().
* check pte_present() first.
Signed-off-by: KAMEZAWA Hiroyuki <[email protected]>
---
arch/ia64/mm/init.c | 2 --
include/asm-ia64/pgtable.h | 17 +++++++++++------
2 files changed, 11 insertions(+), 8 deletions(-)
Index: linux-2.6.23-rc2-mm2/include/asm-ia64/pgtable.h
===================================================================
--- linux-2.6.23-rc2-mm2.orig/include/asm-ia64/pgtable.h
+++ linux-2.6.23-rc2-mm2/include/asm-ia64/pgtable.h
@@ -297,7 +297,6 @@ ia64_phys_addr_valid (unsigned long addr
/*
* The following have defined behavior only work if pte_present() is true.
*/
-#define pte_user(pte) ((pte_val(pte) & _PAGE_PL_MASK) == _PAGE_PL_3)
#define pte_write(pte) ((unsigned) (((pte_val(pte) & _PAGE_AR_MASK) >> _PAGE_AR_SHIFT) - 2) <= 4)
#define pte_exec(pte) ((pte_val(pte) & _PAGE_AR_RX) != 0)
#define pte_dirty(pte) ((pte_val(pte) & _PAGE_D) != 0)
@@ -324,14 +323,20 @@ ia64_phys_addr_valid (unsigned long addr
* set_pte() is also called by the kernel, but we can expect that the kernel
* flushes icache explicitly if necessary.
*/
+#define pte_present_exec_user(pte)\
+ ((pte_val(pte) & (_PAGE_P | _PAGE_PL_MASK | _PAGE_AR_RX)) == \
+ (_PAGE_P | _PAGE_PL_3 | _PAGE_AR_RX))
+
extern void __ia64_sync_icache_dcache(pte_t pteval);
static inline void set_pte(pte_t *ptep, pte_t pteval)
{
- if (pte_exec(pteval) && // flush only new executable page.
- pte_present(pteval) && // swap out ?
- pte_user(pteval) && // ignore kernel page
- (!pte_present(*ptep) ||// do_no_page or swap in, migration,
- pte_pfn(*ptep) != pte_pfn(pteval))) // do_wp_page(), page copy
+ /* page is present && page is user && page is executable
+ * && (page swapin or new page or page migraton
+ * || copy_on_write with page copying.)
+ */
+ if (pte_present_exec_user(pteval) &&
+ (!pte_present(*ptep) ||
+ pte_pfn(*ptep) != pte_pfn(pteval)))
/* load_module() calles flush_icache_range() explicitly*/
__ia64_sync_icache_dcache(pteval);
*ptep = pteval;
Index: linux-2.6.23-rc2-mm2/arch/ia64/mm/init.c
===================================================================
--- linux-2.6.23-rc2-mm2.orig/arch/ia64/mm/init.c
+++ linux-2.6.23-rc2-mm2/arch/ia64/mm/init.c
@@ -60,8 +60,6 @@ __ia64_sync_icache_dcache (pte_t pte)
struct page *page;
unsigned long order;
- BUG_ON(!pte_exec(pte));
-
page = pte_page(pte);
addr = (unsigned long) page_address(page);
-
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