lkml.org 
[lkml]   [2007]   [Mar]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH] swsusp: Disable nonboot CPUs before entering platform suspend
Date
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 <rjw@sisk.pl>
> > > ---
> > > 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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-03-09 20:39    [W:0.094 / U:0.084 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site