diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/power/power.h | 1 | ||||
| -rw-r--r-- | kernel/power/snapshot.c | 2 | ||||
| -rw-r--r-- | kernel/power/swsusp.c | 78 |
3 files changed, 28 insertions, 53 deletions
diff --git a/kernel/power/power.h b/kernel/power/power.h index c98923e13e75..893ee655085c 100644 --- a/kernel/power/power.h +++ b/kernel/power/power.h @@ -66,6 +66,7 @@ extern asmlinkage int swsusp_arch_suspend(void); extern asmlinkage int swsusp_arch_resume(void); extern int restore_highmem(void); +extern void free_pagedir(struct pbe *pblist); extern struct pbe *alloc_pagedir(unsigned nr_pages, gfp_t gfp_mask, int safe_needed); extern void create_pbe_list(struct pbe *pblist, unsigned nr_pages); extern void swsusp_free(void); diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c index 96cc3e21e97d..b8a2e9a63206 100644 --- a/kernel/power/snapshot.c +++ b/kernel/power/snapshot.c @@ -216,7 +216,7 @@ static void copy_data_pages(struct pbe *pblist) * free_pagedir - free pages allocated with alloc_pagedir() */ -static void free_pagedir(struct pbe *pblist) +void free_pagedir(struct pbe *pblist) { struct pbe *pbe; diff --git a/kernel/power/swsusp.c b/kernel/power/swsusp.c index a456ffe7a3c8..8511c7f3386a 100644 --- a/kernel/power/swsusp.c +++ b/kernel/power/swsusp.c @@ -629,74 +629,43 @@ int swsusp_resume(void) } /** - * swsusp_pagedir_relocate - It is possible, that some memory pages - * occupied by the list of PBEs collide with pages where we're going to - * restore from the loaded pages later. We relocate them here. + * mark_unsafe_pages - mark the pages that cannot be used for storing + * the image during resume, because they conflict with the pages that + * had been used before suspend */ -static struct pbe *swsusp_pagedir_relocate(struct pbe *pblist) +static void mark_unsafe_pages(struct pbe *pblist) { struct zone *zone; unsigned long zone_pfn; - struct pbe *pbpage, *tail, *p; - void *m; - int rel = 0; + struct pbe *p; if (!pblist) /* a sanity check */ - return NULL; - - pr_debug("swsusp: Relocating pagedir (%lu pages to check)\n", - swsusp_info.pagedir_pages); + return; /* Clear page flags */ - for_each_zone (zone) { - for (zone_pfn = 0; zone_pfn < zone->spanned_pages; ++zone_pfn) - if (pfn_valid(zone_pfn + zone->zone_start_pfn)) - ClearPageNosaveFree(pfn_to_page(zone_pfn + + for (zone_pfn = 0; zone_pfn < zone->spanned_pages; ++zone_pfn) + if (pfn_valid(zone_pfn + zone->zone_start_pfn)) + ClearPageNosaveFree(pfn_to_page(zone_pfn + zone->zone_start_pfn)); } /* Mark orig addresses */ - for_each_pbe (p, pblist) SetPageNosaveFree(virt_to_page(p->orig_address)); - tail = pblist + PB_PAGE_SKIP; - - /* Relocate colliding pages */ - - for_each_pb_page (pbpage, pblist) { - if (PageNosaveFree(virt_to_page((unsigned long)pbpage))) { - m = (void *)get_safe_page(GFP_ATOMIC | __GFP_COLD); - if (!m) - return NULL; - memcpy(m, (void *)pbpage, PAGE_SIZE); - if (pbpage == pblist) - pblist = (struct pbe *)m; - else - tail->next = (struct pbe *)m; - pbpage = (struct pbe *)m; - - /* We have to link the PBEs again */ - for (p = pbpage; p < pbpage + PB_PAGE_SKIP; p++) - if (p->next) /* needed to save the end */ - p->next = p + 1; - - rel++; - } - tail = pbpage + PB_PAGE_SKIP; - } +} - /* This is for swsusp_free() */ - for_each_pb_page (pbpage, pblist) { - SetPageNosave(virt_to_page(pbpage)); - SetPageNosaveFree(virt_to_page(pbpage)); +static void copy_page_backup_list(struct pbe *dst, struct pbe *src) +{ + /* We assume both lists contain the same number of elements */ + while (src) { + dst->orig_address = src->orig_address; + dst->swap_address = src->swap_address; + dst = dst->next; + src = src->next; } - - printk("swsusp: Relocated %d pages\n", rel); - - return pblist; } /* @@ -942,10 +911,15 @@ static int read_suspend_image(void) if ((error = read_pagedir(p))) return error; - create_pbe_list(p, nr_copy_pages); - - if (!(pagedir_nosave = swsusp_pagedir_relocate(p))) + mark_unsafe_pages(p); + pagedir_nosave = alloc_pagedir(nr_copy_pages, GFP_ATOMIC, 1); + if (pagedir_nosave) { + create_pbe_list(pagedir_nosave, nr_copy_pages); + copy_page_backup_list(pagedir_nosave, p); + } + free_pagedir(p); + if (!pagedir_nosave) return -ENOMEM; /* Allocate memory for the image and read the data from swap */ |