Messages in this thread | | | From | "Liu, Chuansheng" <> | Subject | RE: [PATCH v2] sched/fair: fix find_idlest_cpu return -1 | Date | Fri, 5 Dec 2014 01:48:25 +0000 |
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> -----Original Message----- > From: Vincent Guittot [mailto:vincent.guittot@linaro.org] > Sent: Thursday, December 04, 2014 8:15 PM > To: Zhang, Jun > Cc: mingo@redhat.com; Peter Zijlstra; gregkh@linuxfoundation.org; Hillf > Danton; linux-kernel; stable@vger.kernel.org; Liu, Chuansheng; Liu, > Changcheng > Subject: Re: [PATCH v2] sched/fair: fix find_idlest_cpu return -1 > > On 4 December 2014 at 12:43, <jun.zhang@intel.com> wrote: > > From: zhang jun <jun.zhang@intel.com> > > > > in function select_task_rq_fair, when find_idlest_cpu return -1 and sd->child > == NULL > > select_task_rq_fair return -1, system panic. > > you forgot to add on which kernel version this patch applies. > > We don't have such issue on 3.18-rc7 as find_idlest_cpu don't return > -1. We only need a cleanup of the test against -1 for 3.18-rc > Agreed, so Jun can make two patches: The first one patch is in find_idlest_cpu() to not return -1 and based on stable-branch such as 3.14.x; The second patch is one cleanup for new_cpu == -1 judgment against the 3.18-rc, since it is no possibility now;
Best Regards Chuansheng
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