linux-stable.git/kernel/power/snapshot.c, branch v5.7

Merge tag 's390-5.7-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

2020-04-04T16:45:50+00:00

Pull s390 updates from Vasily Gorbik:

- Update maintainers. Niklas Schnelle takes over zpci and Vineeth
Vijayan common io code.

- Extend cpuinfo to include topology information.

- Add new extended counters for IBM z15 and sampling buffer allocation
rework in perf code.

- Add control over zeroing out memory during system restart.

- CCA protected key block version 2 support and other
fixes/improvements in crypto code.

- Convert to new fallthrough; annotations.

- Replace zero-length arrays with flexible-arrays.

- QDIO debugfs and other small improvements.

- Drop 2-level paging support optimization for compat tasks. Varios mm
cleanups.

- Remove broken and unused hibernate / power management support.

- Remove fake numa support which does not bring any benefits.

- Exclude offline CPUs from CPU topology masks to be more consistent
with other architectures.

- Prevent last branching instruction address leaking to userspace.

- Other small various fixes and improvements all over the code.

* tag 's390-5.7-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (57 commits)
s390/mm: cleanup init_new_context() callback
s390/mm: cleanup virtual memory constants usage
s390/mm: remove page table downgrade support
s390/qdio: set qdio_irq->cdev at allocation time
s390/qdio: remove unused function declarations
s390/ccwgroup: remove pm support
s390/ap: remove power management code from ap bus and drivers
s390/zcrypt: use kvmalloc instead of kmalloc for 256k alloc
s390/mm: cleanup arch_get_unmapped_area() and friends
s390/ism: remove pm support
s390/cio: use fallthrough;
s390/vfio: use fallthrough;
s390/zcrypt: use fallthrough;
s390: use fallthrough;
s390/cpum_sf: Fix wrong page count in error message
s390/diag: fix display of diagnose call statistics
s390/ap: Remove ap device suspend and resume callbacks
s390/pci: Improve handling of unset UID
s390/pci: Fix zpci_alloc_domain() over allocation
s390/qdio: pass ISC as parameter to chsc_sadc()
...

PM: remove s390 specific callbacks

2020-03-23T12:41:55+00:00

ARCH_SAVE_PAGE_KEYS has been introduced in order to be able to save
and restore s390 specific storage keys into a hibernation image.
With hibernation support removed from s390 there is no point in
keeping the callbacks.

Acked-by: Christian Borntraeger 
Acked-by: Peter Oberparleiter 
Signed-off-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik

PM / hibernate: fix typo "reserverd_size" -> "reserved_size"

2020-02-20T10:58:01+00:00

Fix a mistake in a variable name in a comment.

Signed-off-by: Alexandre Belloni 
Signed-off-by: Rafael J. Wysocki

Merge back new material related to system-wide PM for v5.6.

2020-01-23T15:00:56+00:00

PM: hibernate: fix crashes with init_on_free=1

2020-01-16T22:51:45+00:00

Upon resuming from hibernation, free pages may contain stale data from
the kernel that initiated the resume. This breaks the invariant
inflicted by init_on_free=1 that freed pages must be zeroed.

To deal with this problem, make clear_free_pages() also clear the free
pages when init_on_free is enabled.

Fixes: 6471384af2a6 ("mm: security: introduce init_on_alloc=1 and init_on_free=1 boot options")
Reported-by: Johannes Stezenbach 
Signed-off-by: Alexander Potapenko 
Cc: 5.3+  # 5.3+
Signed-off-by: Rafael J. Wysocki

PM: hibernate: fix spelling mistake "shapshot" -> "snapshot"

2020-01-10T11:15:30+00:00

There is a spelling mistake in a pr_info message. Fix it.

Signed-off-by: Colin Ian King 
Signed-off-by: Rafael J. Wysocki

PM: hibernate: Add more logging on hibernation failure

2020-01-07T12:31:12+00:00

Hibernation fails when the kernel cannot allocate enough memory
to copy all pages of RAM in use.

Ensure that the failure reason is clearly logged, and clearly
attributable to the hibernation module.

Signed-off-by: Luigi Semenzato 
[ rjw: Subject & changelog ]
Signed-off-by: Rafael J. Wysocki

PM: hibernate: improve arithmetic division in preallocate_highmem_fraction()

2020-01-07T11:42:56+00:00

do_div() does a 64-by-32 division. Use div64_u64() instead of
do_div() if the divisor is u64, to avoid truncation to 32-bit.

This change also cleans up code a tad.

Signed-off-by: Wen Yang 
[ rjw: Subject ]
Signed-off-by: Rafael J. Wysocki

PM / hibernate: memory_bm_find_bit(): Tighten node optimisation

2019-10-20T23:24:27+00:00

When looking for a bit by number we make use of the cached result from the
preceding lookup to speed up operation.  Firstly we check if the requested
pfn is within the cached zone and if not lookup the new zone.  We then
check if the offset for that pfn falls within the existing cached node.
This happens regardless of whether the node is within the zone we are
now scanning.  With certain memory layouts it is possible for this to
false trigger creating a temporary alias for the pfn to a different bit.
This leads the hibernation code to free memory which it was never allocated
with the expected fallout.

Ensure the zone we are scanning matches the cached zone before considering
the cached node.

Deep thanks go to Andrea for many, many, many hours of hacking and testing
that went into cornering this bug.

Reported-by: Andrea Righi 
Tested-by: Andrea Righi 
Signed-off-by: Andy Whitcroft 
Signed-off-by: Rafael J. Wysocki

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428

2019-06-05T15:37:16+00:00

Based on 1 normalized pattern(s):

  this file is released under the gplv2

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 68 file(s).

Signed-off-by: Thomas Gleixner 
Reviewed-by: Armijn Hemel 
Reviewed-by: Allison Randal 
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190531190114.292346262@linutronix.de
Signed-off-by: Greg Kroah-Hartman