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s390/mm: remove incorrect _REGION3_ENTRY_ORIGIN define

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_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>
This commit is contained in:
Heiko Carstens 2017-05-22 13:27:34 +02:00 committed by Martin Schwidefsky
parent f5bbd72198
commit f96c6f72bc
1 changed files with 1 additions and 3 deletions
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4
arch/s390/include/asm/pgtable.h
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@ -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;