The patch titled
read-write-migration-entries-make-mprotect-convert-write-migration fix
has been added to the -mm tree. Its filename is
read-write-migration-entries-make-mprotect-convert-write-migration-fix.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
From: Christoph Lameter <clameter@xxxxxxx>
On Thu, 27 Apr 2006, Andrew Morton wrote:
> For some reason David has just nuked PAGE_READONLY in sparc64, so this won't
> compile.
The check for PAGE_READONLY is not really essential. We just want to be
safe for the unlikely case that if mprotect is called during page
migration. If we simply reset all migration entries to read then
nothing bad can happen. We just may have to take another fault to correct
the permissions later.
Signed-off-by: Christoph Lameter <clameter@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
mm/mprotect.c | 7 +++++--
1 files changed, 5 insertions(+), 2 deletions(-)
diff -puN mm/mprotect.c~read-write-migration-entries-make-mprotect-convert-write-migration-fix mm/mprotect.c
--- 25/mm/mprotect.c~read-write-migration-entries-make-mprotect-convert-write-migration-fix Thu Apr 27 16:18:39 2006
+++ 25-akpm/mm/mprotect.c Thu Apr 27 16:18:39 2006
@@ -48,11 +48,14 @@ static void change_pte_range(struct mm_s
set_pte_at(mm, addr, pte, ptent);
lazy_mmu_prot_update(ptent);
} else
- if (!pte_file(oldpte) && pgprot_val(newprot) ==
- pgprot_val(PAGE_READONLY)) {
+ if (!pte_file(oldpte)) {
swp_entry_t entry = pte_to_swp_entry(oldpte);
if (is_write_migration_entry(entry)) {
+ /*
+ * A protection check would be difficult
+ * Just be safe and disable write.
+ */
make_migration_entry_read(&entry);
set_pte_at(mm, addr, pte,
swp_entry_to_pte(entry));
_
Patches currently in -mm which might be from clameter@xxxxxxx are
page-migration-make-do_swap_page-redo-the-fault.patch
slab-extract-cache_free_alien-from-__cache_free.patch
migration-remove-unnecessary-pageswapcache-checks.patch
migration-remove-unnecessary-pageswapcache-checks-fix.patch
swapless-v2-try_to_unmap-rename-ignrefs-to-migration.patch
swapless-v2-add-migration-swap-entries.patch
swapless-v2-make-try_to_unmap-create-migration-entries.patch
swapless-v2-rip-out-swap-portion-of-old-migration-code.patch
swapless-v2-revise-main-migration-logic.patch
wait-for-migrating-page-after-incr-of-page-count-under-anon_vma-lock.patch
preserve-write-permissions-in-migration-entries.patch
migration_entry_wait-use-the-pte-lock-instead-of-the-anon_vma-lock.patch
read-write-migration-entries-implement-correct-behavior-in-copy_one_pte.patch
read-write-migration-entries-make-mprotect-convert-write-migration.patch
read-write-migration-entries-make-mprotect-convert-write-migration-fix.patch
-
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