powerpc: Make it possible to select hibernation on all PowerPCs

Just as with kexec, hibernation may fail even on well-tested platforms:
some PCI device, a driver of which doesn't play well with hibernation,
is enough to break resuming.

Hibernation code is not much platform dependent, and hiding features only
because these were not verified on a particular hardware is
counterproductive: we just prevent the features from being widely tested.

For example, with this patch I just tested hibernation on a MPC83xx
board, and it works quite well, modulo a few drivers that need some
fixing.

So, let's make it possible to select hibernation support for all
PowerPCs, then let's wait for any possible bug reports, and actually fix
(or just collect ;-) the bugs instead of hiding them. If some platforms
really can't stand hibernation, we can make a blacklist, with proper
comments why exactly hibernation doesn't work, whether it is possible to
fix, and what needs to be done to fix it.

CONFIG_HIBERNATION is still =n by default, so the commit doesn't change
anything apart from ability to set it to =y.

I'm not sure if EXPERIMENTAL dependency is needed, I'd rather not add it
for a few reasons:

1) It doesn't matter much, for distro kernels user has no clue that some
   feature is experimental. Majority of defconfigs enable EXPERIMENTAL
   anyway (90 vs. 4, which, btw, means that EXPERIMENTAL is overused
   in Kconfigs);

2) EXPERIMENTAL is a good thing for features that change default
   behaviour of a kernel, while for hibernation user has to explicitly
   issue 'echo disk > /sys/power/state' to trigger any hibernation bugs;

3) Per init/Kconfig, EXPERIMENTAL is a good thing to scare and discourage
   users from 'widespread use of a feature', while we want to encourage
   that use.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

This commit is contained in:

Anton Vorontsov

2009-10-05 07:44:27 +00:00

committed by

Benjamin Herrenschmidt

parent 7424639af4

commit 64eb38a6e9

1 changed files with 0 additions and 11 deletions

11

arch/powerpc/Kconfig

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 @ -199,19 +199,8 @@ config DEFAULT_UIMAGE
 config REDBOOT
 	bool
 config HIBERNATE_32
 	bool
 	depends on (PPC_PMAC && !SMP) || BROKEN
 	default y
 config HIBERNATE_64
 	bool
 	depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
 	default y
 config ARCH_HIBERNATION_POSSIBLE
 	bool
 	depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
 	default y
 config ARCH_SUSPEND_POSSIBLE

powerpc: Make it possible to select hibernation on all PowerPCs

11 arch/powerpc/Kconfig Unescape Escape View File

11

arch/powerpc/Kconfig

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