xiaomi-sm8450/android_kernel_xiaomi_sm8450
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[PATCH] swsusp: low level interface

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Introduce the low level interface that can be used for handling the
snapshot of the system memory by the in-kernel swap-writing/reading code of
swsusp and the userland interface code (to be introduced shortly).

Also change the way in which swsusp records the allocated swap pages and,
consequently, simplifies the in-kernel swap-writing/reading code (this is
necessary for the userland interface too).  To this end, it introduces two
helper functions in mm/swapfile.c, so that the swsusp code does not refer
directly to the swap internals.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Rafael J. Wysocki
2006-03-23 02:59:59 -08:00
committed by Linus Torvalds
parent 2b322ce210
commit f577eb30af
6 changed files with 680 additions and 515 deletions
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12
kernel/power/disk.c
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@@ -26,9 +26,9 @@ extern suspend_disk_method_t pm_disk_mode;
extern int swsusp_shrink_memory(void);
extern int swsusp_suspend(void);
extern int swsusp_write(struct pbe *pblist, unsigned int nr_pages);
extern int swsusp_write(void);
extern int swsusp_check(void);
extern int swsusp_read(struct pbe **pblist_ptr);
extern int swsusp_read(void);
extern void swsusp_close(void);
extern int swsusp_resume(void);
@@ -70,10 +70,6 @@ static void power_down(suspend_disk_method_t mode)
while(1);
}
static int in_suspend __nosavedata = 0;
static inline void platform_finish(void)
{
if (pm_disk_mode == PM_DISK_PLATFORM) {
@@ -145,7 +141,7 @@ int pm_suspend_disk(void)
if (in_suspend) {
device_resume();
pr_debug("PM: writing image.\n");
error = swsusp_write(pagedir_nosave, nr_copy_pages);
error = swsusp_write();
if (!error)
power_down(pm_disk_mode);
else {
@@ -216,7 +212,7 @@ static int software_resume(void)
pr_debug("PM: Reading swsusp image.\n");
if ((error = swsusp_read(&pagedir_nosave))) {
if ((error = swsusp_read())) {
swsusp_free();
goto Thaw;
}