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[PATCH] convert s390 page handling macros to functions

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Convert s390 page handling macros to functions.  In particular this fixes a
problem with s390's SetPageUptodate macro which uses its input parameter
twice which again can cause subtle bugs.

[akpm@osdl.org: build fix]
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Heiko Carstens 2006-09-29 01:58:41 -07:00 committed by Linus Torvalds
parent d1807793e1
commit 2dcea57ae1
3 changed files with 46 additions and 51 deletions
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2
arch/s390/appldata/appldata_base.c
View File

@ -16,7 +16,7 @@
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include <linux/page-flags.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/pagemap.h>
#include <linux/sysctl.h>

84
include/asm-s390/pgtable.h
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@ -31,9 +31,9 @@
* the S390 page table tree.
*/
#ifndef __ASSEMBLY__
#include <linux/mm_types.h>
#include <asm/bug.h>
#include <asm/processor.h>
#include <linux/threads.h>
struct vm_area_struct; /* forward declaration (include/linux/mm.h) */
struct mm_struct;
@ -597,31 +597,31 @@ ptep_establish(struct vm_area_struct *vma,
* should therefore only be called if it is not mapped in any
* address space.
*/
#define page_test_and_clear_dirty(_page) \
({ \
struct page *__page = (_page); \
unsigned long __physpage = __pa((__page-mem_map) << PAGE_SHIFT); \
int __skey = page_get_storage_key(__physpage); \
if (__skey & _PAGE_CHANGED) \
page_set_storage_key(__physpage, __skey & ~_PAGE_CHANGED);\
(__skey & _PAGE_CHANGED); \
})
static inline int page_test_and_clear_dirty(struct page *page)
{
unsigned long physpage = __pa((page - mem_map) << PAGE_SHIFT);
int skey = page_get_storage_key(physpage);
if (skey & _PAGE_CHANGED)
page_set_storage_key(physpage, skey & ~_PAGE_CHANGED);
return skey & _PAGE_CHANGED;
}
/*
* Test and clear referenced bit in storage key.
*/
#define page_test_and_clear_young(page) \
({ \
struct page *__page = (page); \
unsigned long __physpage = __pa((__page-mem_map) << PAGE_SHIFT);\
int __ccode; \
asm volatile( \
" rrbe 0,%1\n" \
" ipm %0\n" \
" srl %0,28\n" \
: "=d" (__ccode) : "a" (__physpage) : "cc"); \
(__ccode & 2); \
})
static inline int page_test_and_clear_young(struct page *page)
{
unsigned long physpage = __pa((page - mem_map) << PAGE_SHIFT);
int ccode;
asm volatile (
"rrbe 0,%1\n"
"ipm %0\n"
"srl %0,28\n"
: "=d" (ccode) : "a" (physpage) : "cc" );
return ccode & 2;
}
/*
* Conversion functions: convert a page and protection to a page entry,
@ -634,32 +634,28 @@ static inline pte_t mk_pte_phys(unsigned long physpage, pgprot_t pgprot)
return __pte;
}
#define mk_pte(pg, pgprot) \
({ \
struct page *__page = (pg); \
pgprot_t __pgprot = (pgprot); \
unsigned long __physpage = __pa((__page-mem_map) << PAGE_SHIFT); \
pte_t __pte = mk_pte_phys(__physpage, __pgprot); \
__pte; \
})
static inline pte_t mk_pte(struct page *page, pgprot_t pgprot)
{
unsigned long physpage = __pa((page - mem_map) << PAGE_SHIFT);
#define pfn_pte(pfn, pgprot) \
({ \
pgprot_t __pgprot = (pgprot); \
unsigned long __physpage = __pa((pfn) << PAGE_SHIFT); \
pte_t __pte = mk_pte_phys(__physpage, __pgprot); \
__pte; \
})
return mk_pte_phys(physpage, pgprot);
}
static inline pte_t pfn_pte(unsigned long pfn, pgprot_t pgprot)
{
unsigned long physpage = __pa((pfn) << PAGE_SHIFT);
return mk_pte_phys(physpage, pgprot);
}
#ifdef __s390x__
#define pfn_pmd(pfn, pgprot) \
({ \
pgprot_t __pgprot = (pgprot); \
unsigned long __physpage = __pa((pfn) << PAGE_SHIFT); \
pmd_t __pmd = __pmd(__physpage + pgprot_val(__pgprot)); \
__pmd; \
})
static inline pmd_t pfn_pmd(unsigned long pfn, pgprot_t pgprot)
{
unsigned long physpage = __pa((pfn) << PAGE_SHIFT);
return __pmd(physpage + pgprot_val(pgprot));
}
#endif /* __s390x__ */

11
include/linux/page-flags.h
View File

@ -128,12 +128,11 @@
#define PageUptodate(page) test_bit(PG_uptodate, &(page)->flags)
#ifdef CONFIG_S390
#define SetPageUptodate(_page) \
do { \
struct page *__page = (_page); \
if (!test_and_set_bit(PG_uptodate, &__page->flags)) \
page_test_and_clear_dirty(_page); \
} while (0)
static inline void SetPageUptodate(struct page *page)
{
if (!test_and_set_bit(PG_uptodate, &page->flags))
page_test_and_clear_dirty(page);
}
#else
#define SetPageUptodate(page) set_bit(PG_uptodate, &(page)->flags)
#endif