linux-stable.git/kernel/power/swap.c, branch linux-4.0.y

PM / hibernate: Deletion of an unnecessary check before the function call "vfree"

2014-11-18T01:49:40+00:00

The vfree() function performs also input parameter validation. Thus the test
around the call is not needed.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring 
Signed-off-by: Rafael J. Wysocki

PM / Hibernate: Migrate to ktime_t

2014-11-03T00:02:55+00:00

This patch migrates swsusp_show_speed and its callers to using ktime_t instead
of 'struct timeval' which suffers from the y2038 problem.

Changes to swsusp_show_speed:
        - use ktime_t for start and stop times
        - pass start and stop times by value
Calling functions affected:
        - load_image
        - load_image_lzo
        - save_image
        - save_image_lzo
        - hibernate_preallocate_memory
Design decisions:
        - use ktime_t to preserve same granularity of reporting as before
        - use centisecs logic as before to avoid 'div by zero' issues caused by
          using seconds and nanoseconds directly
        - use monotonic time (ktime_get()) since we only care about elapsed time.

Signed-off-by: Tina Ruchandani 
Suggested-by: Arnd Bergmann 
Reviewed-by: Arnd Bergmann 
Acked-by: Pavel Machek 
Signed-off-by: Rafael J. Wysocki

PM / hibernate: fixed typo in comment

2014-05-31T22:23:07+00:00

Fix a trivial comment typo (s/mam/map) in kernel/power/swap.c.

Signed-off-by: Niv Yehezkel 
Signed-off-by: Rafael J. Wysocki

kernel: use macros from compiler.h instead of attribute((...))

2014-04-07T23:36:11+00:00

To increase compiler portability there is  which
provides convenience macros for various gcc constructs.  Eg: __weak for
__attribute__((weak)).  I've replaced all instances of gcc attributes
with the right macro in the kernel subsystem.

Signed-off-by: Gideon Israel Dsouza 
Cc: "Rafael J. Wysocki" 
Cc: Ingo Molnar 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

PM / Hibernate: use rb_entry

2012-11-14T23:37:08+00:00

Since the software suspend extents are organized in an rbtree, use rb_entry
instead of container_of, as it is semantically more appropriate in order to
get a node as it is iterated.

Signed-off-by: Davidlohr Bueso 
Signed-off-by: Rafael J. Wysocki

PM / Hibernate: Print hibernation/thaw progress indicator one line at a time.

2012-07-01T11:31:23+00:00

With the introduction of suspend to both into in-kernel hibernation
code, dmesg was getting polluted with backspace characters printed as
part of image saving progress indicator. This patch introduces printing
of progress indicator on image save/load every 10% and one line at a
time. As an additional benefit, all other messages emitted by the kernel
during hibernation/thaw should now print cleanly as well.

Signed-off-by: Bojan Smojver 
Signed-off-by: Rafael J. Wysocki

PM / Hibernate: Enable suspend to both for in-kernel hibernation.

2012-07-01T11:31:22+00:00

It is often useful to suspend to memory after hibernation image has been
written to disk. If the battery runs out or power is otherwise lost, the
computer will resume from the hibernated image. If not, it will resume
from memory and hibernation image will be discarded.

Signed-off-by: Bojan Smojver 
Signed-off-by: Rafael J. Wysocki

PM / Hibernate: Hibernate/thaw fixes/improvements

2012-05-01T19:24:15+00:00

 1. Do not allocate memory for buffers from emergency pools, unless
    absolutely required. Do not warn about and do not retry non-essential
    failed allocations.

 2. Do not check the amount of free pages left on every single page
    write, but wait until one map is completely populated and then check.

 3. Set maximum number of pages for read buffering consistently, instead
    of inadvertently depending on the size of the sector type.

 4. Fix copyright line, which I missed when I submitted the hibernation
    threading patch.

 5. Dispense with bit shifting arithmetic to improve readability.

 6. Really recalculate the number of pages required to be free after all
    allocations have been done.

 7. Fix calculation of pages required for read buffering. Only count in
    pages that do not belong to high memory.

Signed-off-by: Bojan Smojver 
Signed-off-by: Rafael J. Wysocki

PM / Hibernate: fix the number of pages used for hibernate/thaw buffering

2012-04-24T21:53:28+00:00

Hibernation regression fix, since 3.2.

Calculate the number of required free pages based on non-high memory
pages only, because that is where the buffers will come from.

Commit 081a9d043c983f161b78fdc4671324d1342b86bc introduced a new buffer
page allocation logic during hibernation, in order to improve the
performance. The amount of pages allocated was calculated based on total
amount of pages available, although only non-high memory pages are
usable for this purpose. This caused hibernation code to attempt to over
allocate pages on platforms that have high memory, which led to hangs.

Signed-off-by: Bojan Smojver 
Signed-off-by: Rafael J. Wysocki

PM / Hibernate: Drop the check of swap space size for compressed image

2012-01-13T23:41:37+00:00

For compressed image, the space required is not known until
we finish compressing and writing all pages.
This patch drops the check, and if swap space is not enough
finally, system can still restore to normal after writing
swap fails for compressed images.

Signed-off-by: Barry Song 
Acked-by: Pavel Machek 
Signed-off-by: Rafael J. Wysocki