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[PATCH] swsusp: Fix alloc_pagedir

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Get rid of the FIXME in kernel/power/snapshot.c#alloc_pagedir() and
simplify the functions called by it.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Rafael J. Wysocki 2006-09-25 23:32:50 -07:00 committed by Linus Torvalds
parent f6143aa60e
commit cd560bb2f9
1 changed files with 17 additions and 15 deletions
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32
kernel/power/snapshot.c
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@ -316,12 +316,12 @@ static void free_pagedir(struct pbe *pblist, int clear_nosave_free)
* fill_pb_page - Create a list of PBEs on a given memory page
*/
static inline void fill_pb_page(struct pbe *pbpage)
static inline void fill_pb_page(struct pbe *pbpage, unsigned int n)
{
struct pbe *p;
p = pbpage;
pbpage += PB_PAGE_SKIP;
pbpage += n - 1;
do
p->next = p + 1;
while (++p < pbpage);
@ -330,24 +330,26 @@ static inline void fill_pb_page(struct pbe *pbpage)
/**
* create_pbe_list - Create a list of PBEs on top of a given chain
* of memory pages allocated with alloc_pagedir()
*
* This function assumes that pages allocated by alloc_image_page() will
* always be zeroed.
*/
static inline void create_pbe_list(struct pbe *pblist, unsigned int nr_pages)
{
struct pbe *pbpage, *p;
struct pbe *pbpage;
unsigned int num = PBES_PER_PAGE;
for_each_pb_page (pbpage, pblist) {
if (num >= nr_pages)
break;
fill_pb_page(pbpage);
fill_pb_page(pbpage, PBES_PER_PAGE);
num += PBES_PER_PAGE;
}
if (pbpage) {
for (num -= PBES_PER_PAGE - 1, p = pbpage; num < nr_pages; p++, num++)
p->next = p + 1;
p->next = NULL;
num -= PBES_PER_PAGE;
fill_pb_page(pbpage, nr_pages - num);
}
}
@ -374,17 +376,17 @@ static struct pbe *alloc_pagedir(unsigned int nr_pages, gfp_t gfp_mask,
return NULL;
pblist = alloc_image_page(gfp_mask, safe_needed);
/* FIXME: rewrite this ugly loop */
for (pbe = pblist, num = PBES_PER_PAGE; pbe && num < nr_pages;
pbe = pbe->next, num += PBES_PER_PAGE) {
pbe = pblist;
for (num = PBES_PER_PAGE; num < nr_pages; num += PBES_PER_PAGE) {
if (!pbe) {
free_pagedir(pblist, 1);
return NULL;
}
pbe += PB_PAGE_SKIP;
pbe->next = alloc_image_page(gfp_mask, safe_needed);
pbe = pbe->next;
}
if (!pbe) { /* get_zeroed_page() failed */
free_pagedir(pblist, 1);
pblist = NULL;
} else
create_pbe_list(pblist, nr_pages);
create_pbe_list(pblist, nr_pages);
return pblist;
}