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Subject[RFC][PATCH -mm 5/5] swsusp: Introduce some helpful constants
Date
Introduce some constants that hopefully will help improve the readability kernel/power/snapshot.c |   45 +++++++++++++++++++++++++--------------------
1 files changed, 25 insertions(+), 20 deletions(-)
Index: linux-2.6.18-rc3-mm2/kernel/power/snapshot.c
===================================================================
--- linux-2.6.18-rc3-mm2.orig/kernel/power/snapshot.c
+++ linux-2.6.18-rc3-mm2/kernel/power/snapshot.c
@@ -57,6 +57,11 @@ static void *buffer;
* so that swsusp_free() can release it.
*/

+#define PG_ANY 0
+#define PG_SAFE 1
+#define PG_UNSAFE_CLEAR 1
+#define PG_UNSAFE_KEEP 0
+
static unsigned int allocated_unsafe_pages;

static void *get_image_page(gfp_t gfp_mask, int safe_needed)
@@ -357,7 +362,7 @@ create_memory_bm(struct memory_bitmap *b
zone_bm = create_zone_bm_list(nr, &ca);
bm->zone_bm_list = zone_bm;
if (!zone_bm) {
- chain_free(&ca, 1);
+ chain_free(&ca, PG_UNSAFE_CLEAR);
return -ENOMEM;
}

@@ -410,7 +415,7 @@ create_memory_bm(struct memory_bitmap *b

Free:
bm->p_list = ca.chain;
- free_memory_bm(bm, 1);
+ free_memory_bm(bm, PG_UNSAFE_CLEAR);
return -ENOMEM;
}

@@ -936,15 +941,15 @@ swsusp_alloc(struct memory_bitmap *orig_
{
int error;

- error = create_memory_bm(orig_bm, GFP_ATOMIC, 0);
+ error = create_memory_bm(orig_bm, GFP_ATOMIC, PG_ANY);
if (error)
goto Free;

- error = create_memory_bm(copy_bm, GFP_ATOMIC, 0);
+ error = create_memory_bm(copy_bm, GFP_ATOMIC, PG_ANY);
if (error)
goto Free;

- error = get_highmem_buffer(0);
+ error = get_highmem_buffer(PG_ANY);
if (error)
goto Free;

@@ -1078,7 +1083,7 @@ int snapshot_read_next(struct snapshot_h

if (!buffer) {
/* This makes the buffer be freed by swsusp_free() */
- buffer = get_image_page(GFP_ATOMIC, 0);
+ buffer = get_image_page(GFP_ATOMIC, PG_ANY);
if (!buffer)
return -ENOMEM;
}
@@ -1299,10 +1304,10 @@ prepare_highmem_image(struct memory_bitm
{
unsigned int to_alloc;

- if (create_memory_bm(bm, GFP_ATOMIC, 1))
+ if (create_memory_bm(bm, GFP_ATOMIC, PG_SAFE))
return -ENOMEM;

- if (get_highmem_buffer(1))
+ if (get_highmem_buffer(PG_SAFE))
return -ENOMEM;

to_alloc = count_free_highmem_pages();
@@ -1415,8 +1420,8 @@ static inline int last_highmem_page_copi

static inline void free_highmem_data(void)
{
- free_memory_bm(safe_highmem_bm, 1);
- free_image_page(buffer, 1);
+ free_memory_bm(safe_highmem_bm, PG_UNSAFE_CLEAR);
+ free_image_page(buffer, PG_UNSAFE_CLEAR);
}
#else
static inline int get_safe_write_buffer(void) { return 0; }
@@ -1465,19 +1470,19 @@ prepare_image(struct memory_bitmap *new_
int error;

/* If there is no highmem, the buffer will not be necessary */
- free_image_page(buffer, 1);
+ free_image_page(buffer, PG_UNSAFE_CLEAR);

nr_highmem = count_highmem_image_pages(bm);
error = mark_unsafe_pages(bm);
if (error)
goto Free;

- error = create_memory_bm(new_bm, GFP_ATOMIC, 1);
+ error = create_memory_bm(new_bm, GFP_ATOMIC, PG_SAFE);
if (error)
goto Free;

duplicate_memory_bitmap(new_bm, bm);
- free_memory_bm(bm, 0);
+ free_memory_bm(bm, PG_UNSAFE_KEEP);
if (nr_highmem > 0) {
error = prepare_highmem_image(bm, &nr_highmem);
if (error)
@@ -1494,7 +1499,7 @@ prepare_image(struct memory_bitmap *new_
nr_pages = nr_copy_pages - nr_highmem - allocated_unsafe_pages;
nr_pages = DIV_ROUND_UP(nr_pages, PBES_PER_LINKED_PAGE);
while (nr_pages > 0) {
- lp = get_image_page(GFP_ATOMIC, 1);
+ lp = get_image_page(GFP_ATOMIC, PG_SAFE);
if (!lp) {
error = -ENOMEM;
goto Free;
@@ -1525,7 +1530,7 @@ prepare_image(struct memory_bitmap *new_
/* Free the reserved safe pages so that chain_alloc() can use them */
while (sp_list) {
lp = sp_list->next;
- free_image_page(sp_list, 1);
+ free_image_page(sp_list, PG_UNSAFE_CLEAR);
sp_list = lp;
}
return 0;
@@ -1604,7 +1609,7 @@ int snapshot_write_next(struct snapshot_
if (handle->offset == 0) {
if (!buffer)
/* This makes the buffer be freed by swsusp_free() */
- buffer = get_image_page(GFP_ATOMIC, 0);
+ buffer = get_image_page(GFP_ATOMIC, PG_ANY);

if (!buffer)
return -ENOMEM;
@@ -1618,7 +1623,7 @@ int snapshot_write_next(struct snapshot_
if (error)
return error;

- error = create_memory_bm(&copy_bm, GFP_ATOMIC, 0);
+ error = create_memory_bm(&copy_bm, GFP_ATOMIC, PG_ANY);
if (error)
return error;

@@ -1668,7 +1673,7 @@ void snapshot_write_finalize(struct snap
copy_last_highmem_page();
/* Free only if we have loaded the image entirely */
if (handle->prev && handle->cur > nr_meta_pages + nr_copy_pages) {
- free_memory_bm(&orig_bm, 1);
+ free_memory_bm(&orig_bm, PG_UNSAFE_CLEAR);
free_highmem_data();
}
}
@@ -1710,7 +1715,7 @@ int restore_highmem(void)
struct highmem_pbe *pbe = highmem_pblist;
void *buf;

- buf = get_image_page(GFP_ATOMIC, 1);
+ buf = get_image_page(GFP_ATOMIC, PG_SAFE);
if (!buf)
return -ENOMEM;

@@ -1718,7 +1723,7 @@ int restore_highmem(void)
swap_two_pages_data(pbe->copy_page, pbe->orig_page, buf);
pbe = pbe->next;
}
- free_image_page(buf, 1);
+ free_image_page(buf, PG_UNSAFE_CLEAR);
return 0;
}
#endif /* CONFIG_HIGHMEM */
of the code.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
---
-
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