On Friday, 9 March 2007 13:29, Heiko Carstens wrote:
> On Wed, Mar 07, 2007 at 09:07:17PM +0000, Pavel Machek wrote:
> > Hi!
> >
> > > Prevent the WARN_ON() in
> > > arch/x86_64/kernel/acpi/sleep.c:init_low_mapping()
> > > from triggering by disabling nonboot CPUs before we finally enter the
> > > platform
> > > suspend.
> > >
> > > Signed-off-by: Rafael J. Wysocki <[EMAIL PROTECTED]>
> > > ---
> > > kernel/power/disk.c | 1 +
> > > kernel/power/user.c | 2 +-
> > > 2 files changed, 2 insertions(+), 1 deletion(-)
> > >
> > > Index: linux-2.6.21-rc2-mm2/kernel/power/disk.c
> > > ===================================================================
> > > --- linux-2.6.21-rc2-mm2.orig/kernel/power/disk.c
> > > +++ linux-2.6.21-rc2-mm2/kernel/power/disk.c
> > > @@ -61,6 +61,7 @@ static void power_down(suspend_disk_meth
> > > switch(mode) {
> > > case PM_DISK_PLATFORM:
> > > if (pm_ops && pm_ops->enter) {
> > > + disable_nonboot_cpus();
> > > kernel_shutdown_prepare(SYSTEM_SUSPEND_DISK);
> > > pm_ops->enter(PM_SUSPEND_DISK);
> > > break;
> >
> > ...so, if pm_ops is non-null, power_down does nonboot cpu disabling,
> > otherwise we proceed with cpus enabled?
> >
> > That looks ugly.
> >
> > Is the warning bogus? Or maybe we should *always* disable nonboot cpus
> > in powerdown path?
>
> Is disable_nonboot_cpus() assuming that first_cpu(cpu_present_map) is
> the boot cpu? Just wondering why disable_nonboot_cpus() isn't using just
> any_online_cpu(cpu_online_map)...
Is your question related to the code in kernel/cpu.c?
Rafael
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