diff options
| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2017-06-14 08:57:24 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-07-26 08:25:06 +0200 |
| commit | 8457d7754ba72a8b41900ccac46ff0561fc6e962 (patch) | |
| tree | 382e439de0e47af276e0a0f7c99771eb0fe66289 /arch | |
| parent | 810fa7efe0e50693e9ef81d182c29be067fb84d6 (diff) | |
s390/mm: remove and correct comments within pgtable.h
Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/s390/include/asm/pgtable.h | 31 |
1 files changed, 4 insertions, 27 deletions
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h index bb59a0aa3249..f8d9369947e0 100644 --- a/arch/s390/include/asm/pgtable.h +++ b/arch/s390/include/asm/pgtable.h @@ -11,18 +11,6 @@ #ifndef _ASM_S390_PGTABLE_H #define _ASM_S390_PGTABLE_H -/* - * The Linux memory management assumes a three-level page table setup. - * For s390 64 bit we use up to four of the five levels the hardware - * provides (region first tables are not used). - * - * The "pgd_xxx()" functions are trivial for a folded two-level - * setup: the pgd is never bad, and a pmd always exists (as it's folded - * into the pgd entry) - * - * This file contains the functions and defines necessary to modify and use - * the S390 page table tree. - */ #ifndef __ASSEMBLY__ #include <linux/sched.h> #include <linux/mm_types.h> @@ -79,11 +67,6 @@ extern unsigned long zero_page_mask; /* TODO: s390 cannot support io_remap_pfn_range... */ #endif /* !__ASSEMBLY__ */ -/* - * PMD_SHIFT determines the size of the area a second-level page - * table can map - * PGDIR_SHIFT determines what a third-level page table entry can map - */ #define PMD_SHIFT 20 #define PUD_SHIFT 31 #define P4D_SHIFT 42 @@ -98,12 +81,6 @@ extern unsigned long zero_page_mask; #define PGDIR_SIZE (1UL << PGDIR_SHIFT) #define PGDIR_MASK (~(PGDIR_SIZE-1)) -/* - * entries per page directory level: the S390 is two-level, so - * we don't really have any PMD directory physically. - * for S390 segment-table entries are combined to one PGD - * that leads to 1024 pte per pgd - */ #define PTRS_PER_PTE 256 #define PTRS_PER_PMD 2048 #define PTRS_PER_PUD 2048 @@ -269,7 +246,7 @@ static inline int is_module_addr(void *addr) */ /* Bits in the segment/region table address-space-control-element */ -#define _ASCE_ORIGIN ~0xfffUL/* segment table origin */ +#define _ASCE_ORIGIN ~0xfffUL/* region/segment table origin */ #define _ASCE_PRIVATE_SPACE 0x100 /* private space control */ #define _ASCE_ALT_EVENT 0x80 /* storage alteration event control */ #define _ASCE_SPACE_SWITCH 0x40 /* space switch event */ @@ -320,9 +297,9 @@ static inline int is_module_addr(void *addr) #define _SEGMENT_ENTRY_BITS 0xfffffffffffffe33UL #define _SEGMENT_ENTRY_BITS_LARGE 0xfffffffffff0ff33UL #define _SEGMENT_ENTRY_ORIGIN_LARGE ~0xfffffUL /* large page address */ -#define _SEGMENT_ENTRY_ORIGIN ~0x7ffUL/* segment table origin */ -#define _SEGMENT_ENTRY_PROTECT 0x200 /* page protection bit */ -#define _SEGMENT_ENTRY_NOEXEC 0x100 /* region no-execute bit */ +#define _SEGMENT_ENTRY_ORIGIN ~0x7ffUL/* page table origin */ +#define _SEGMENT_ENTRY_PROTECT 0x200 /* segment protection bit */ +#define _SEGMENT_ENTRY_NOEXEC 0x100 /* segment no-execute bit */ #define _SEGMENT_ENTRY_INVALID 0x20 /* invalid segment table entry */ #define _SEGMENT_ENTRY (0) |