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Old 03-18-2011, 03:25 PM
Manoj Iyer
 
Default PM / Hibernate: Improve comments in hibernate_preallocate_memory()

From: Rafael J. Wysocki <rjw@sisk.pl>

One comment in hibernate_preallocate_memory() is wrong, so fix it and
add one more comment to clarify the meaning of the fixed one.

BugLink: http://launchpad.net/bugs/737208

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
(cherry picked from commit 266f1a25eff5ff98c498d7754a419aacfd88f71c)

Signed-off-by: Manoj Iyer <manoj.iyer@canonical.com>
---
kernel/power/snapshot.c | 6 ++++--
1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 7fa52b5..703a057 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -1318,12 +1318,14 @@ int hibernate_preallocate_memory(void)

/* Compute the maximum number of saveable pages to leave in memory. */
max_size = (count - (size + PAGES_FOR_IO)) / 2 - 2 * SPARE_PAGES;
+ /* Compute the desired number of image pages specified by image_size. */
size = DIV_ROUND_UP(image_size, PAGE_SIZE);
if (size > max_size)
size = max_size;
/*
- * If the maximum is not less than the current number of saveable pages
- * in memory, allocate page frames for the image and we're done.
+ * If the desired number of image pages is at least as large as the
+ * current number of saveable pages in memory, allocate page frames for
+ * the image and we're done.
*/
if (size >= saveable) {
pages = preallocate_image_highmem(save_highmem);
--
1.7.1


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