Messages in this thread Patch in this message | | | Date | Mon, 15 Jul 2013 17:22:57 +0530 | From | "Srivatsa S. Bhat" <> | Subject | Re: [PATCH 7/8] cpufreq: Preserve policy structure across suspend/resume |
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On 07/15/2013 03:51 PM, Viresh Kumar wrote: > On 15 July 2013 15:35, Srivatsa S. Bhat > <srivatsa.bhat@linux.vnet.ibm.com> wrote: >> Actually even I was wondering about this while writing the patch and >> I even tested shutdown after multiple suspend/resume cycles, to verify that >> the refcount is messed up. But surprisingly, things worked just fine. > > What kind of system have you tested it on? >
The system has 2 sockets with 8 cores each, and has Intel Sandybridge CPUs. I had used a local patch to simulate CPU hotplug in the suspend-to-ram path using the freeze state of pm_test (because I had other problems in using the 'processors' state of pm_test). The patch is shown below:
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c index ece0422..fe07b77 100644 --- a/kernel/power/suspend.c +++ b/kernel/power/suspend.c @@ -342,8 +342,13 @@ static int enter_state(suspend_state_t state) if (error) goto Unlock; - if (suspend_test(TEST_FREEZER)) + if (suspend_test(TEST_FREEZER)) { + pr_debug("Disabling nonboot CPUs\n"); + disable_nonboot_cpus(); + pr_debug("Enabling nonboot CPUs\n"); + enable_nonboot_cpus(); goto Finish; + } pr_debug("PM: Entering %s sleep\n", pm_states[state]); pm_restrict_gfp_mask();
Regards, Srivatsa S. Bhat
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