The patch titled
swapless-pm-add-r-w-migration-entries fix
has been added to the -mm tree. Its filename is
swapless-pm-add-r-w-migration-entries-fix.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: swapless-pm-add-r-w-migration-entries fix
From: Hugh Dickins <hugh@xxxxxxxxxxx>
Remove unnecessary obfuscation from sys_swapon's range check on swap type,
which blew up causing memory corruption once swapless migration made
MAX_SWAPFILES no longer 2 ^ MAX_SWAPFILES_SHIFT.
Signed-off-by: Hugh Dickins <hugh@xxxxxxxxxxx>
Acked-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
mm/swapfile.c | 14 +-------------
1 file changed, 1 insertion(+), 13 deletions(-)
diff -puN mm/swapfile.c~swapless-pm-add-r-w-migration-entries-fix mm/swapfile.c
--- devel/mm/swapfile.c~swapless-pm-add-r-w-migration-entries-fix 2006-06-06 13:23:49.000000000 -0700
+++ devel-akpm/mm/swapfile.c 2006-06-06 13:23:49.000000000 -0700
@@ -1403,19 +1403,7 @@ asmlinkage long sys_swapon(const char __
if (!(p->flags & SWP_USED))
break;
error = -EPERM;
- /*
- * Test if adding another swap device is possible. There are
- * two limiting factors: 1) the number of bits for the swap
- * type swp_entry_t definition and 2) the number of bits for
- * the swap type in the swap ptes as defined by the different
- * architectures. To honor both limitations a swap entry
- * with swap offset 0 and swap type ~0UL is created, encoded
- * to a swap pte, decoded to a swp_entry_t again and finally
- * the swap type part is extracted. This will mask all bits
- * from the initial ~0UL that can't be encoded in either the
- * swp_entry_t or the architecture definition of a swap pte.
- */
- if (type > swp_type(pte_to_swp_entry(swp_entry_to_pte(swp_entry(~0UL,0))))) {
+ if (type >= MAX_SWAPFILES) {
spin_unlock(&swap_lock);
goto out;
}
_
Patches currently in -mm which might be from hugh@xxxxxxxxxxx are
mm-vm_bug_on.patch
page-migration-make-do_swap_page-redo-the-fault.patch
migration-remove-unnecessary-pageswapcache-checks.patch
swapless-pm-add-r-w-migration-entries.patch
swapless-pm-add-r-w-migration-entries-fix.patch
add-page_mkwrite-vm_operations-method.patch
mm-remove-vm_locked-before-remap_pfn_range-and-drop-vm_shm.patch
swapoff-atomic_inc_not_zero-on-mm_users.patch
remove-unused-o_flags-from-do_shmat.patch
fix-update_mmu_cache-in-fremapc.patch
fix-update_mmu_cache-in-fremapc-fix.patch
page-migration-simplify-migrate_pages.patch
page-migration-simplify-migrate_pages-tweaks.patch
page-migration-handle-freeing-of-pages-in-migrate_pages.patch
page-migration-use-allocator-function-for-migrate_pages.patch
page-migration-support-moving-of-individual-pages.patch
page-migration-detailed-status-for-moving-of-individual-pages.patch
page-migration-support-moving-of-individual-pages-fixes.patch
page-migration-support-a-vma-migration-function.patch
allow-migration-of-mlocked-pages.patch
-
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