* [merged] mm-debug_vm_pgtable-ppc64-avoid-setting-top-bits-in-radom-value.patch removed from -mm tree
@ 2020-10-16 20:47 akpm
0 siblings, 0 replies; only message in thread
From: akpm @ 2020-10-16 20:47 UTC (permalink / raw)
To: aneesh.kumar, anshuman.khandual, christophe.leroy, mm-commits, mpe
The patch titled
Subject: mm/debug_vm_pgtable/ppc64: avoid setting top bits in radom value
has been removed from the -mm tree. Its filename was
mm-debug_vm_pgtable-ppc64-avoid-setting-top-bits-in-radom-value.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Subject: mm/debug_vm_pgtable/ppc64: avoid setting top bits in radom value
ppc64 use bit 62 to indicate a pte entry (_PAGE_PTE). Avoid setting that
bit in random value.
Link: https://lkml.kernel.org/r/20200902114222.181353-4-aneesh.kumar@linux.ibm.com
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/debug_vm_pgtable.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
--- a/mm/debug_vm_pgtable.c~mm-debug_vm_pgtable-ppc64-avoid-setting-top-bits-in-radom-value
+++ a/mm/debug_vm_pgtable.c
@@ -44,10 +44,17 @@
* entry type. But these bits might affect the ability to clear entries with
* pxx_clear() because of how dynamic page table folding works on s390. So
* while loading up the entries do not change the lower 4 bits. It does not
- * have affect any other platform.
+ * have affect any other platform. Also avoid the 62nd bit on ppc64 that is
+ * used to mark a pte entry.
*/
-#define S390_MASK_BITS 4
-#define RANDOM_ORVALUE GENMASK(BITS_PER_LONG - 1, S390_MASK_BITS)
+#define S390_SKIP_MASK GENMASK(3, 0)
+#if __BITS_PER_LONG == 64
+#define PPC64_SKIP_MASK GENMASK(62, 62)
+#else
+#define PPC64_SKIP_MASK 0x0
+#endif
+#define ARCH_SKIP_MASK (S390_SKIP_MASK | PPC64_SKIP_MASK)
+#define RANDOM_ORVALUE (GENMASK(BITS_PER_LONG - 1, 0) & ~ARCH_SKIP_MASK)
#define RANDOM_NZVALUE GENMASK(7, 0)
static void __init pte_basic_tests(unsigned long pfn, pgprot_t prot)
_
Patches currently in -mm which might be from aneesh.kumar@linux.ibm.com are
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2020-10-16 20:47 [merged] mm-debug_vm_pgtable-ppc64-avoid-setting-top-bits-in-radom-value.patch removed from -mm tree akpm
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