On Fri, Feb 02, 2007 at 01:11:50PM +0100, Rafael J. Wysocki wrote:
> Hi,
>
> On Friday, 2 February 2007 12:20, Tim Dijkstra wrote:
> > Hi,
> >
> > Could someone please tell me what (stable) kernels have support for:
> >
> > a) Suspend/Resume with swap files
>
> Should be in 2.6.19 and later.
>
> > b) Platform mode instead
>
> I'm not sure what you mean here ...
i guess it is SNAPSHOT_PMOPS...
>
> > And is there a easy way to test for swap file support, some /sys entry
> > perhaps?
>
> At run time you can check if the SNAPSHOT_SET_SWAP_AREA ioctl is present
> (ie. open /dev/snapshot and try to call the ioctl from it).
Unfortunately, calling SNAPSHOT_PMOPS just for testing does not seem
like a good idea.
I thought about some automatism, that falls back to "shutdown" in suspend.c
somehow like that (no real patch):
if (use_platform_suspend) {
int ret = platform_prepare(snapshot_fd);
- if (ret < 0)
+ if (ret < 0) {
fprintf(stderr, "suspend: pm_ops->prepare returned "
"error %d\n", ret);
+ use_platform_suspend = 0;
+ }
}
but i was not sure about the side effects. OTOH, the in-kernel method AFAIR
simply aborts if pm_ops->prepare is present, but not working, and i never had
a report of the kind "platform mode does nothing at all", just "platform mode
does not work correctly", so it seems like this case never happens.
But IIRC, even platform_prepare is enough to oops a non-ACPI kernel as it is
right now :-(
--
Stefan Seyfried
QA / R&D Team Mobile Devices | "Any ideas, John?"
SUSE LINUX Products GmbH, Nürnberg | "Well, surrounding them's out."
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