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Date: Wed, 2 Aug 2006 18:53:46 +0200 From: "Rafael J. Wysocki" <rjw@...k.pl> To: Andrew Morton <akpm@...l.org> Cc: LKML <linux-kernel@...r.kernel.org>, Pavel Machek <pavel@....cz> Subject: [PATCH 2/3] swsusp: Reorder memory-allocating functions Move some functions in kernel/power/snapshot.c to a better place (in the same file) and introduce free_image_page() (will be necessary in the future). Signed-off-by: Rafael J. Wysocki <rjw@...k.pl> --- kernel/power/snapshot.c | 93 +++++++++++++++++++++++++++--------------------- 1 file changed, 53 insertions(+), 40 deletions(-) Index: linux-2.6.18-rc2-mm1/kernel/power/snapshot.c =================================================================== --- linux-2.6.18-rc2-mm1.orig/kernel/power/snapshot.c 2006-08-01 08:58:45.000000000 +0200 +++ linux-2.6.18-rc2-mm1/kernel/power/snapshot.c 2006-08-01 22:15:41.000000000 +0200 @@ -156,6 +156,58 @@ static inline int save_highmem(void) {re static inline int restore_highmem(void) {return 0;} #endif +/** + * @safe_needed - on resume, for storing the PBE list and the image, + * we can only use memory pages that do not conflict with the pages + * used before suspend. + * + * The unsafe pages are marked with the PG_nosave_free flag + * and we count them using unsafe_pages + */ + +static unsigned int unsafe_pages; + +static void *alloc_image_page(gfp_t gfp_mask, int safe_needed) +{ + void *res; + + res = (void *)get_zeroed_page(gfp_mask); + if (safe_needed) + while (res && PageNosaveFree(virt_to_page(res))) { + /* The page is unsafe, mark it for swsusp_free() */ + SetPageNosave(virt_to_page(res)); + unsafe_pages++; + res = (void *)get_zeroed_page(gfp_mask); + } + if (res) { + SetPageNosave(virt_to_page(res)); + SetPageNosaveFree(virt_to_page(res)); + } + return res; +} + +unsigned long get_safe_page(gfp_t gfp_mask) +{ + return (unsigned long)alloc_image_page(gfp_mask, 1); +} + +/** + * free_image_page - free page represented by @addr, allocated with + * alloc_image_page (page flags set by it must be cleared) + */ + +static inline void free_image_page(void *addr, int clear_nosave_free) +{ + ClearPageNosave(virt_to_page(addr)); + if (clear_nosave_free) + ClearPageNosaveFree(virt_to_page(addr)); + free_page((unsigned long)addr); +} + +/** + * pfn_is_nosave - check if given pfn is in the 'nosave' section + */ + static inline int pfn_is_nosave(unsigned long pfn) { unsigned long nosave_begin_pfn = __pa(&__nosave_begin) >> PAGE_SHIFT; @@ -245,7 +297,6 @@ static void copy_data_pages(struct pbe * BUG_ON(pbe); } - /** * free_pagedir - free pages allocated with alloc_pagedir() */ @@ -256,10 +307,7 @@ static void free_pagedir(struct pbe *pbl while (pblist) { pbe = (pblist + PB_PAGE_SKIP)->next; - ClearPageNosave(virt_to_page(pblist)); - if (clear_nosave_free) - ClearPageNosaveFree(virt_to_page(pblist)); - free_page((unsigned long)pblist); + free_image_page(pblist, clear_nosave_free); pblist = pbe; } } @@ -303,41 +351,6 @@ static inline void create_pbe_list(struc } } -static unsigned int unsafe_pages; - -/** - * @safe_needed - on resume, for storing the PBE list and the image, - * we can only use memory pages that do not conflict with the pages - * used before suspend. - * - * The unsafe pages are marked with the PG_nosave_free flag - * and we count them using unsafe_pages - */ - -static void *alloc_image_page(gfp_t gfp_mask, int safe_needed) -{ - void *res; - - res = (void *)get_zeroed_page(gfp_mask); - if (safe_needed) - while (res && PageNosaveFree(virt_to_page(res))) { - /* The page is unsafe, mark it for swsusp_free() */ - SetPageNosave(virt_to_page(res)); - unsafe_pages++; - res = (void *)get_zeroed_page(gfp_mask); - } - if (res) { - SetPageNosave(virt_to_page(res)); - SetPageNosaveFree(virt_to_page(res)); - } - return res; -} - -unsigned long get_safe_page(gfp_t gfp_mask) -{ - return (unsigned long)alloc_image_page(gfp_mask, 1); -} - /** * alloc_pagedir - Allocate the page directory. * - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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