Messages in this thread Patch in this message | | | From | Nigel Cunningham <> | Subject | [Suspend2][ 04/10] [Suspend2] Prepare pbe list for atomic restore. | Date | Tue, 27 Jun 2006 14:39:00 +1000 |
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This routine prepares the list of page backup entries that is used by the swsusp lowlevel code in doing the atomic restore.
Signed-off-by: Nigel Cunningham <nigel@suspend2.net>
kernel/power/atomic_copy.c | 50 ++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 50 insertions(+), 0 deletions(-)
diff --git a/kernel/power/atomic_copy.c b/kernel/power/atomic_copy.c index 6d1bc68..556e481 100644 --- a/kernel/power/atomic_copy.c +++ b/kernel/power/atomic_copy.c @@ -135,3 +135,53 @@ static unsigned long __suspend_get_next_ return counter; } +/* + * prepare_suspend2_pbe_list + * + * Prepare pageset2 pages for doing the atomic copy. If necessary, + * we allocate extra pages. + * + */ + +void prepare_suspend2_pbe_list(void) +{ + int orig_pfn, copy_pfn, i = 1; + struct pbe *this_pbe = NULL, *last_pbe = NULL; + + orig_pfn = copy_pfn = -1; + + pagedir_nosave = NULL; + + do { + if (!this_pbe || + ((((unsigned long) this_pbe) & (PAGE_SIZE - 1)) + + 2 * sizeof(struct pbe)) > PAGE_SIZE) { + /* Get the next page for pbes */ + this_pbe = (struct pbe *) suspend_get_nonconflicting_page(); + BUG_ON(!this_pbe); + BUG_ON(PagePageset1(virt_to_page(this_pbe))); + } else + this_pbe++; + + do { + orig_pfn = get_next_bit_on(pageset1_map, orig_pfn); + if (orig_pfn < 0) + return; + copy_pfn = get_next_bit_on(pageset1_copy_map, copy_pfn); + } while (PageHighMem(pfn_to_page(orig_pfn))); + + if (!last_pbe) + pagedir_nosave = this_pbe; + else + last_pbe->next = this_pbe; + + last_pbe = this_pbe; + this_pbe->orig_address = (unsigned long) page_address(pfn_to_page(orig_pfn)); + this_pbe->address = (unsigned long) page_address(pfn_to_page(copy_pfn)); + this_pbe->next = NULL; /* get_nonconflicting_page doesn't get zeroed pages */ + + i++; + + } while (1); +} + -- Nigel Cunningham nigel at suspend2 dot net - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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