From 56f99bcb52d64d70078b41cc176dd8b6f5763108 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Sun, 6 May 2007 14:50:52 -0700 Subject: swsusp: free more memory Move the definition of PAGES_FOR_IO to kernel/power/power.h and introduce SPARE_PAGES representing the number of pages that should be freed by the swsusp's memory shrinker in addition to PAGES_FOR_IO so that device drivers can allocate some memory (up to 1 MB total) in their .suspend() routines without causing the suspend to fail. Signed-off-by: Rafael J. Wysocki Acked-by: Pavel Machek Cc: Nigel Cunningham Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/power/power.h | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) (limited to 'kernel/power/power.h') diff --git a/kernel/power/power.h b/kernel/power/power.h index a3e47cbdaf31..34b43542785a 100644 --- a/kernel/power/power.h +++ b/kernel/power/power.h @@ -14,8 +14,18 @@ struct swsusp_info { #ifdef CONFIG_SOFTWARE_SUSPEND -extern int pm_suspend_disk(void); +/* + * Keep some memory free so that I/O operations can succeed without paging + * [Might this be more than 4 MB?] + */ +#define PAGES_FOR_IO ((4096 * 1024) >> PAGE_SHIFT) +/* + * Keep 1 MB of memory free so that device drivers can allocate some pages in + * their .suspend() routines without breaking the suspend to disk. + */ +#define SPARE_PAGES ((1024 * 1024) >> PAGE_SHIFT) +extern int pm_suspend_disk(void); #else static inline int pm_suspend_disk(void) { -- cgit v1.2.3