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mm: remove ptep_establish()

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The last user of ptep_establish in mm/ is long gone.  Remove the architecture
primitive as well.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Martin Schwidefsky 2007-07-17 04:03:03 -07:00 committed by Linus Torvalds
parent 5ee403f584
commit f0e47c229b
5 changed files with 26 additions and 59 deletions
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6
include/asm-arm/pgtable.h
View File

@ -83,14 +83,14 @@
* means that a write to a clean page will cause a permission fault, and
* the Linux MM layer will mark the page dirty via handle_pte_fault().
* For the hardware to notice the permission change, the TLB entry must
* be flushed, and ptep_establish() does that for us.
* be flushed, and ptep_set_access_flags() does that for us.
*
* The "accessed" or "young" bit is emulated by a similar method; we only
* allow accesses to the page if the "young" bit is set. Accesses to the
* page will cause a fault, and handle_pte_fault() will set the young bit
* for us as long as the page is marked present in the corresponding Linux
* PTE entry. Again, ptep_establish() will ensure that the TLB is up to
* date.
* PTE entry. Again, ptep_set_access_flags() will ensure that the TLB is
* up to date.
*
* However, when the "young" bit is cleared, we deny access to the page
* by clearing the hardware PTE. Currently Linux does not flush the TLB

19
include/asm-generic/pgtable.h
View File

@ -3,25 +3,6 @@
#ifndef __ASSEMBLY__
#ifndef __HAVE_ARCH_PTEP_ESTABLISH
/*
* Establish a new mapping:
* - flush the old one
* - update the page tables
* - inform the TLB about the new one
*
* We hold the mm semaphore for reading, and the pte lock.
*
* Note: the old pte is known to not be writable, so we don't need to
* worry about dirty bits etc getting lost.
*/
#define ptep_establish(__vma, __address, __ptep, __entry) \
do { \
set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
flush_tlb_page(__vma, __address); \
} while (0)
#endif
#ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
/*
* Largely same as above, but only sets the access flags (dirty,

11
include/asm-i386/pgtable.h
View File

@ -311,17 +311,6 @@ static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
__ret; \
})
/*
* Rules for using ptep_establish: the pte MUST be a user pte, and
* must be a present->present transition.
*/
#define __HAVE_ARCH_PTEP_ESTABLISH
#define ptep_establish(vma, address, ptep, pteval) \
do { \
set_pte_present((vma)->vm_mm, address, ptep, pteval); \
flush_tlb_page(vma, address); \
} while (0)
#define __HAVE_ARCH_PTEP_CLEAR_DIRTY_FLUSH
#define ptep_clear_flush_dirty(vma, address, ptep) \
({ \

6
include/asm-ia64/pgtable.h
View File

@ -543,8 +543,10 @@ extern void lazy_mmu_prot_update (pte_t pte);
# define ptep_set_access_flags(__vma, __addr, __ptep, __entry, __safely_writable) \
({ \
int __changed = !pte_same(*(__ptep), __entry); \
if (__changed) \
ptep_establish(__vma, __addr, __ptep, __entry); \
if (__changed) { \
set_pte_at((__vma)->vm_mm, (__addr), __ptep, __entry); \
flush_tlb_page(__vma, __addr); \
} \
__changed; \
})
#endif

43
include/asm-s390/pgtable.h
View File

@ -707,16 +707,19 @@ static inline void __ptep_ipte(unsigned long address, pte_t *ptep)
pte_val(*ptep) = _PAGE_TYPE_EMPTY;
}
static inline pte_t
ptep_clear_flush(struct vm_area_struct *vma,
unsigned long address, pte_t *ptep)
static inline void ptep_invalidate(unsigned long address, pte_t *ptep)
{
__ptep_ipte(address, ptep);
ptep = get_shadow_pte(ptep);
if (ptep)
__ptep_ipte(address, ptep);
}
static inline pte_t ptep_clear_flush(struct vm_area_struct *vma,
unsigned long address, pte_t *ptep)
{
pte_t pte = *ptep;
pte_t *shadow_pte = get_shadow_pte(ptep);
__ptep_ipte(address, ptep);
if (shadow_pte)
__ptep_ipte(address, shadow_pte);
ptep_invalidate(address, ptep);
return pte;
}
@ -726,21 +729,14 @@ static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
set_pte_at(mm, addr, ptep, pte_wrprotect(old_pte));
}
static inline void
ptep_establish(struct vm_area_struct *vma,
unsigned long address, pte_t *ptep,
pte_t entry)
{
ptep_clear_flush(vma, address, ptep);
set_pte(ptep, entry);
}
#define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
({ \
int __changed = !pte_same(*(__ptep), __entry); \
if (__changed) \
ptep_establish(__vma, __address, __ptep, __entry); \
__changed; \
#define ptep_set_access_flags(__vma, __addr, __ptep, __entry, __dirty) \
({ \
int __changed = !pte_same(*(__ptep), __entry); \
if (__changed) { \
ptep_invalidate(__addr, __ptep); \
set_pte_at((__vma)->vm_mm, __addr, __ptep, __entry); \
} \
__changed; \
})
/*
@ -940,7 +936,6 @@ extern int remove_shared_memory(unsigned long start, unsigned long size);
#define __HAVE_ARCH_MEMMAP_INIT
extern void memmap_init(unsigned long, int, unsigned long, unsigned long);
#define __HAVE_ARCH_PTEP_ESTABLISH
#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH