Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 8457d775 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
Browse files

s390/mm: remove and correct comments within pgtable.h 



Reviewed-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 810fa7ef

arch/s390/include/asm/pgtable.h

+4 −27
Original line number Diff line number Diff line
@@ -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)