The patch titled
Subject: x86: mm: restore original pte_special check
has been added to the -mm tree. Its filename is
x86-mm-restore-original-pte_special-check.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/x86-mm-restore-original-pte_special-check.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/x86-mm-restore-original-pte_special-check.patch
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From: Mel Gorman <mgorman@xxxxxxx>
Subject: x86: mm: restore original pte_special check
Commit b38af4721f59 ("x86,mm: fix pte_special versus pte_numa") adjusted
the pte_special check to take into account that a special pte had SPECIAL
and neither PRESENT nor PROTNONE. Now that NUMA hinting PTEs are no
longer modifying _PAGE_PRESENT it should be safe to restore the original
pte_special behaviour.
Signed-off-by: Mel Gorman <mgorman@xxxxxxx>
Cc: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Dave Jones <davej@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Kirill Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Sasha Levin <sasha.levin@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/include/asm/pgtable.h | 8 +-------
1 file changed, 1 insertion(+), 7 deletions(-)
diff -puN arch/x86/include/asm/pgtable.h~x86-mm-restore-original-pte_special-check arch/x86/include/asm/pgtable.h
--- a/arch/x86/include/asm/pgtable.h~x86-mm-restore-original-pte_special-check
+++ a/arch/x86/include/asm/pgtable.h
@@ -132,13 +132,7 @@ static inline int pte_exec(pte_t pte)
static inline int pte_special(pte_t pte)
{
- /*
- * See CONFIG_NUMA_BALANCING pte_numa in include/asm-generic/pgtable.h.
- * On x86 we have _PAGE_BIT_NUMA == _PAGE_BIT_GLOBAL+1 ==
- * __PAGE_BIT_SOFTW1 == _PAGE_BIT_SPECIAL.
- */
- return (pte_flags(pte) & _PAGE_SPECIAL) &&
- (pte_flags(pte) & (_PAGE_PRESENT|_PAGE_PROTNONE));
+ return pte_flags(pte) & _PAGE_SPECIAL;
}
static inline unsigned long pte_pfn(pte_t pte)
_
Patches currently in -mm which might be from mgorman@xxxxxxx are
mm-debug-pagealloc-prepare-boottime-configurable-on-off.patch
mm-vmscan-prevent-kswapd-livelock-due-to-pfmemalloc-throttled-process-being-killed.patch
mm-page_alloc-place-zone_id-check-before-vm_bug_on_page-check.patch
mm-vmscan-wake-up-all-pfmemalloc-throttled-processes-at-once.patch
mm-numa-do-not-dereference-pmd-outside-of-the-lock-during-numa-hinting-fault.patch
mm-add-p-protnone-helpers-for-use-by-numa-balancing.patch
mm-convert-p_numa-users-to-p_protnone_numa.patch
ppc64-add-paranoid-warnings-for-unexpected-dsisr_protfault.patch
mm-convert-p_mknonnuma-and-remaining-page-table-manipulations.patch
mm-remove-remaining-references-to-numa-hinting-bits-and-helpers.patch
mm-numa-do-not-trap-faults-on-the-huge-zero-page.patch
x86-mm-restore-original-pte_special-check.patch
mm-numa-add-paranoid-check-around-pte_protnone_numa.patch
mm-numa-avoid-unnecessary-tlb-flushes-when-setting-numa-hinting-entries.patch
do_shared_fault-check-that-mmap_sem-is-held.patch
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