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| author |   Heiko Carstens <heiko.carstens@de.ibm.com> | 2017-05-22 13:27:34 +0200 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-06-12 16:26:00 +0200 |
| commit | f96c6f72bc792e7add27e40ec859a8f5ea72e72b (patch) | |
| tree | 029939e2da951fdee9da446c73ac4e1c897bc4e5 /arch/s390/include/asm/pgtable.h | |
| parent | s390/ptrace: guarded storage regset for the current task (diff) | |
| download | linux-dev-f96c6f72bc792e7add27e40ec859a8f5ea72e72b.tar.xz linux-dev-f96c6f72bc792e7add27e40ec859a8f5ea72e72b.zip | |
s390/mm: remove incorrect _REGION3_ENTRY_ORIGIN define
_REGION3_ENTRY_ORIGIN defines a wrong mask which can be used to
extract a segment table origin from a region 3 table entry. It removes
only the lower 11 instead of 12 bits from a region 3 table entry.
Luckily this bit is currently always zero, so nothing bad happened yet.
In order to avoid future bugs just remove the region 3 specific mask
and use the correct generic _REGION_ENTRY_ORIGIN mask.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/pgtable.h')
| -rw-r--r-- | arch/s390/include/asm/pgtable.h | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h index 3effb26f0e1a..6f8a67a103be 100644 --- a/arch/s390/include/asm/pgtable.h +++ b/arch/s390/include/asm/pgtable.h @@ -301,8 +301,6 @@ static inline int is_module_addr(void *addr) #define _REGION3_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_INVALID) #define _REGION3_ENTRY_ORIGIN_LARGE ~0x7fffffffUL /* large page address */ -#define _REGION3_ENTRY_ORIGIN ~0x7ffUL/* region third table origin */ - #define _REGION3_ENTRY_DIRTY 0x2000 /* SW region dirty bit */ #define _REGION3_ENTRY_YOUNG 0x1000 /* SW region young bit */ #define _REGION3_ENTRY_LARGE 0x0400 /* RTTE-format control, large page */ @@ -641,7 +639,7 @@ static inline unsigned long pud_pfn(pud_t pud) { unsigned long origin_mask; - origin_mask = _REGION3_ENTRY_ORIGIN; + origin_mask = _REGION_ENTRY_ORIGIN; if (pud_large(pud)) origin_mask = _REGION3_ENTRY_ORIGIN_LARGE; return (pud_val(pud) & origin_mask) >> PAGE_SHIFT; |