mm: remove nopage

Nothing in the tree uses nopage any more.  Remove support for it in the
core mm code and documentation (and a few stray references to it in
comments).

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nick Piggin 2008-04-28 02:12:10 -07:00 committed by Linus Torvalds
parent 4d3d5b41a7
commit 3c18ddd160
9 changed files with 11 additions and 43 deletions

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@ -128,15 +128,6 @@ Who: Arjan van de Ven <arjan@linux.intel.com>
---------------------------
What: vm_ops.nopage
When: Soon, provided in-kernel callers have been converted
Why: This interface is replaced by vm_ops.fault, but it has been around
forever, is used by a lot of drivers, and doesn't cost much to
maintain.
Who: Nick Piggin <npiggin@suse.de>
---------------------------
What: PHYSDEVPATH, PHYSDEVBUS, PHYSDEVDRIVER in the uevent environment
When: October 2008
Why: The stacking of class devices makes these values misleading and

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@ -511,7 +511,6 @@ prototypes:
void (*open)(struct vm_area_struct*);
void (*close)(struct vm_area_struct*);
int (*fault)(struct vm_area_struct*, struct vm_fault *);
struct page *(*nopage)(struct vm_area_struct*, unsigned long, int *);
int (*page_mkwrite)(struct vm_area_struct *, struct page *);
locking rules:
@ -519,7 +518,6 @@ locking rules:
open: no yes
close: no yes
fault: no yes
nopage: no yes
page_mkwrite: no yes no
->page_mkwrite() is called when a previously read-only page is
@ -537,4 +535,3 @@ NULL.
ipc/shm.c::shm_delete() - may need BKL.
->read() and ->write() in many drivers are (probably) missing BKL.
drivers/sgi/char/graphics.c::sgi_graphics_nopage() - may need BKL.

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@ -13,7 +13,7 @@
/*
* TODO:
* - remove "mark pages reserved-hacks" from memory allocation code
* and implement nopage()
* and implement fault()
* - check decimation, calculating and reporting image size when
* using decimation
* - implement read(), user mode buffers and overlay (?)

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@ -112,8 +112,9 @@ static int vmlfb_alloc_vram_area(struct vram_area *va, unsigned max_order,
/*
* It seems like __get_free_pages only ups the usage count
* of the first page. This doesn't work with nopage mapping, so
* up the usage count once more.
* of the first page. This doesn't work with fault mapping, so
* up the usage count once more (XXX: should use split_page or
* compound page).
*/
memset((void *)va->logical, 0x00, va->size);

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@ -438,7 +438,7 @@ static int stuffed_readpage(struct gfs2_inode *ip, struct page *page)
int error;
/*
* Due to the order of unstuffing files and ->nopage(), we can be
* Due to the order of unstuffing files and ->fault(), we can be
* asked for a zero page in the case of a stuffed file being extended,
* so we need to supply one here. It doesn't happen often.
*/

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@ -164,8 +164,6 @@ struct vm_operations_struct {
void (*open)(struct vm_area_struct * area);
void (*close)(struct vm_area_struct * area);
int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf);
struct page *(*nopage)(struct vm_area_struct *area,
unsigned long address, int *type);
unsigned long (*nopfn)(struct vm_area_struct *area,
unsigned long address);
@ -648,12 +646,6 @@ static inline int page_mapped(struct page *page)
return atomic_read(&(page)->_mapcount) >= 0;
}
/*
* Error return values for the *_nopage functions
*/
#define NOPAGE_SIGBUS (NULL)
#define NOPAGE_OOM ((struct page *) (-1))
/*
* Error return values for the *_nopfn functions
*/

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@ -1057,8 +1057,7 @@ int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
if (pages)
foll_flags |= FOLL_GET;
if (!write && !(vma->vm_flags & VM_LOCKED) &&
(!vma->vm_ops || (!vma->vm_ops->nopage &&
!vma->vm_ops->fault)))
(!vma->vm_ops || !vma->vm_ops->fault))
foll_flags |= FOLL_ANON;
do {
@ -2199,20 +2198,9 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
BUG_ON(vma->vm_flags & VM_PFNMAP);
if (likely(vma->vm_ops->fault)) {
ret = vma->vm_ops->fault(vma, &vmf);
if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE)))
return ret;
} else {
/* Legacy ->nopage path */
ret = 0;
vmf.page = vma->vm_ops->nopage(vma, address & PAGE_MASK, &ret);
/* no page was available -- either SIGBUS or OOM */
if (unlikely(vmf.page == NOPAGE_SIGBUS))
return VM_FAULT_SIGBUS;
else if (unlikely(vmf.page == NOPAGE_OOM))
return VM_FAULT_OOM;
}
ret = vma->vm_ops->fault(vma, &vmf);
if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE)))
return ret;
/*
* For consistency in subsequent calls, make the faulted page always
@ -2458,7 +2446,7 @@ static inline int handle_pte_fault(struct mm_struct *mm,
if (!pte_present(entry)) {
if (pte_none(entry)) {
if (vma->vm_ops) {
if (vma->vm_ops->fault || vma->vm_ops->nopage)
if (likely(vma->vm_ops->fault))
return do_linear_fault(mm, vma, address,
pte, pmd, write_access, entry);
if (unlikely(vma->vm_ops->nopfn))

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@ -33,7 +33,7 @@ static unsigned char mincore_page(struct address_space *mapping, pgoff_t pgoff)
* When tmpfs swaps out a page from a file, any process mapping that
* file will not get a swp_entry_t in its pte, but rather it is like
* any other file mapping (ie. marked !present and faulted in with
* tmpfs's .nopage). So swapped out tmpfs mappings are tested here.
* tmpfs's .fault). So swapped out tmpfs mappings are tested here.
*
* However when tmpfs moves the page from pagecache and into swapcache,
* it is still in core, but the find_get_page below won't find it.

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@ -662,7 +662,6 @@ void page_remove_rmap(struct page *page, struct vm_area_struct *vma)
printk (KERN_EMERG " page->mapping = %p\n", page->mapping);
print_symbol (KERN_EMERG " vma->vm_ops = %s\n", (unsigned long)vma->vm_ops);
if (vma->vm_ops) {
print_symbol (KERN_EMERG " vma->vm_ops->nopage = %s\n", (unsigned long)vma->vm_ops->nopage);
print_symbol (KERN_EMERG " vma->vm_ops->fault = %s\n", (unsigned long)vma->vm_ops->fault);
}
if (vma->vm_file && vma->vm_file->f_op)