Introduce some constants that hopefully will help improve the readability of
code in kernel/power/snapshot.c.
Signed-off-by: Rafael J. Wysocki <[email protected]>
Acked-by: Pavel Machek <[email protected]>
---
kernel/power/snapshot.c | 24 +++++++++++++++---------
1 file changed, 15 insertions(+), 9 deletions(-)
Index: linux-2.6.18-rc3-mm2/kernel/power/snapshot.c
===================================================================
--- linux-2.6.18-rc3-mm2.orig/kernel/power/snapshot.c 2006-08-10 08:09:26.000000000 +0200
+++ linux-2.6.18-rc3-mm2/kernel/power/snapshot.c 2006-08-10 08:09:56.000000000 +0200
@@ -167,6 +167,11 @@ static inline int restore_highmem(void)
* and we count them using unsafe_pages
*/
+#define PG_ANY 0
+#define PG_SAFE 1
+#define PG_UNSAFE_CLEAR 1
+#define PG_UNSAFE_KEEP 0
+
static unsigned int unsafe_pages;
static void *alloc_image_page(gfp_t gfp_mask, int safe_needed)
@@ -190,7 +195,7 @@ static void *alloc_image_page(gfp_t gfp_
unsigned long get_safe_page(gfp_t gfp_mask)
{
- return (unsigned long)alloc_image_page(gfp_mask, 1);
+ return (unsigned long)alloc_image_page(gfp_mask, PG_SAFE);
}
/**
@@ -381,7 +386,7 @@ static struct pbe *alloc_pagedir(unsigne
pbe = pblist;
for (num = PBES_PER_PAGE; num < nr_pages; num += PBES_PER_PAGE) {
if (!pbe) {
- free_pagedir(pblist, 1);
+ free_pagedir(pblist, PG_UNSAFE_CLEAR);
return NULL;
}
pbe += PB_PAGE_SKIP;
@@ -458,12 +463,13 @@ static struct pbe *swsusp_alloc(unsigned
{
struct pbe *pblist;
- if (!(pblist = alloc_pagedir(nr_pages, GFP_ATOMIC | __GFP_COLD, 0))) {
+ pblist = alloc_pagedir(nr_pages, GFP_ATOMIC | __GFP_COLD, PG_ANY);
+ if (!pblist) {
printk(KERN_ERR "suspend: Allocating pagedir failed.\n");
return NULL;
}
- if (alloc_data_pages(pblist, GFP_ATOMIC | __GFP_COLD, 0)) {
+ if (alloc_data_pages(pblist, GFP_ATOMIC | __GFP_COLD, PG_ANY)) {
printk(KERN_ERR "suspend: Allocating image pages failed.\n");
swsusp_free();
return NULL;
@@ -575,7 +581,7 @@ int snapshot_read_next(struct snapshot_h
return 0;
if (!buffer) {
/* This makes the buffer be freed by swsusp_free() */
- buffer = alloc_image_page(GFP_ATOMIC, 0);
+ buffer = alloc_image_page(GFP_ATOMIC, PG_ANY);
if (!buffer)
return -ENOMEM;
}
@@ -688,7 +694,7 @@ static int load_header(struct snapshot_h
error = check_header(info);
if (!error) {
- pblist = alloc_pagedir(info->image_pages, GFP_ATOMIC, 0);
+ pblist = alloc_pagedir(info->image_pages, GFP_ATOMIC, PG_ANY);
if (!pblist)
return -ENOMEM;
restore_pblist = pblist;
@@ -746,10 +752,10 @@ static int prepare_image(struct snapshot
p = restore_pblist;
error = mark_unsafe_pages(p);
if (!error) {
- pblist = alloc_pagedir(nr_pages, GFP_ATOMIC, 1);
+ pblist = alloc_pagedir(nr_pages, GFP_ATOMIC, PG_SAFE);
if (pblist)
copy_page_backup_list(pblist, p);
- free_pagedir(p, 0);
+ free_pagedir(p, PG_UNSAFE_KEEP);
if (!pblist)
error = -ENOMEM;
}
@@ -840,7 +846,7 @@ int snapshot_write_next(struct snapshot_
return 0;
if (!buffer) {
/* This makes the buffer be freed by swsusp_free() */
- buffer = alloc_image_page(GFP_ATOMIC, 0);
+ buffer = alloc_image_page(GFP_ATOMIC, PG_ANY);
if (!buffer)
return -ENOMEM;
}
-
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