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Rafael J. Wysocki 91e7c75ba9 PM: Allow drivers to allocate memory from .prepare() callbacks safely ... If device drivers allocate substantial amounts of memory (above 1 MB) in their hibernate .freeze() callbacks (or in their legacy suspend callbcks during hibernation), the subsequent creation of hibernate image may fail due to the lack of memory. This is the case, because the drivers' .freeze() callbacks are executed after the hibernate memory preallocation has been carried out and the preallocated amount of memory may be too small to cover the new driver allocations. Unfortunately, the drivers' .prepare() callbacks also are executed after the hibernate memory preallocation has completed, so they are not suitable for allocating additional memory either. Thus the only way a driver can safely allocate memory during hibernation is to use a hibernate/suspend notifier. However, the notifiers are called before the freezing of user space and the drivers wanting to use them for allocating additional memory may not know how much memory needs to be allocated at that point. To let device drivers overcome this difficulty rework the hibernation sequence so that the memory preallocation is carried out after the drivers' .prepare() callbacks have been executed, so that the .prepare() callbacks can be used for allocating additional memory to be used by the drivers' .freeze() callbacks. Update documentation to match the new behavior of the code. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>		14 years ago
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Kconfig	PM: Remove CONFIG_PM_VERBOSE	14 years ago
Makefile	kernel: change to new flag variable	14 years ago
block_io.c	…
console.c	…
hibernate.c	PM: Allow drivers to allocate memory from .prepare() callbacks safely	14 years ago
main.c	PM / Hibernate: Add sysfs knob to control size of memory for drivers	14 years ago
power.h	PM / Hibernate: Add sysfs knob to control size of memory for drivers	14 years ago
poweroff.c	…
process.c	…
snapshot.c	Revert "PM / Hibernate: Reduce autotuned default image size"	14 years ago
suspend.c	Merge branch 'syscore' into for-linus	14 years ago
suspend_test.c	…
swap.c	…
user.c	PM / Hibernate: Fix ioctl SNAPSHOT_S2RAM	14 years ago