Add temporary patch to fix intel_pstate oops and lockdep report on

  various atom based CPUs.

2 files changed, 59 insertions, 1 deletions

diff --git a/0001-Temp-fix-for-intel_pstate-oopses-and-lockdep-report-.patch b/0001-Temp-fix-for-intel_pstate-oopses-and-lockdep-report-.patch
new file mode 100644
index 000000000..b28878e28
--- /dev/null
+++ b/0001-Temp-fix-for-intel_pstate-oopses-and-lockdep-report-.patch
@@ -0,0 +1,52 @@
+From e2fea58e57993ab2ed011eb35a034507347336ed Mon Sep 17 00:00:00 2001
+From: "Rafael J. Wysocki" <rjw@rjwysocki.net>
+Date: Thu, 17 Mar 2016 15:07:16 +0100
+Subject: [PATCH] Temp fix for intel_pstate oopses and lockdep report with
+ Linux v4.5-1822-g63e30271b04c
+
+On Thursday, March 17, 2016 09:02:29 AM Josh Boyer wrote:
+> Hello,
+
+Hi,
+
+> I have an Intel Atom based NUC that is producing the following
+> backtraces on boot of Linus' tree as of last evening.  This does not
+> happen with a tree with top level commit 271ecc5253e2, but does happen
+> when using the tree mentioned in the subject with top level commit
+> 63e30271b04c.
+>
+> The first backtrace appears to be a warning because the intel_pstate
+> driver is calling wrmsrl_on_cpu when interrupts are disabled?  Not
+> sure on that one.
+>
+> The second backtrace is a lockdep report.  Both are from the same boot.
+
+OK, thanks for the report.
+
+Can you please try the patch below?
+
+I'm actually unsure if we can do that safely in general for Atom because
+of the initialization, but that's what Core does anyway.
+
+Srinivas, Philippe, why exactly do we need the wrmsrl_on_cpu() in
+atom_set_pstate()?  core_set_pstate() uses wrmsrl() and seems to be doing fine.
+---
+ drivers/cpufreq/intel_pstate.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
+index cb5607495816..32d5d6456290 100644
+--- a/drivers/cpufreq/intel_pstate.c
++++ b/drivers/cpufreq/intel_pstate.c
+@@ -587,7 +587,7 @@ static void atom_set_pstate(struct cpudata *cpudata, int pstate)
+ 
+ 	val |= vid;
+ 
+-	wrmsrl_on_cpu(cpudata->cpu, MSR_IA32_PERF_CTL, val);
++	wrmsrl(MSR_IA32_PERF_CTL, val);
+ }
+ 
+ static int silvermont_get_scaling(void)
+-- 
+2.5.0
+
diff --git a/kernel.spec b/kernel.spec
index 85d931b56..77d23262e 100644
--- a/kernel.spec
+++ b/kernel.spec
@@ -42,7 +42,7 @@ Summary: The Linux kernel
 # For non-released -rc kernels, this will be appended after the rcX and
 # gitX tags, so a 3 here would become part of release "0.rcX.gitX.3"
 #
-%global baserelease 1
+%global baserelease 2
 %global fedora_build %{baserelease}
 
 # base_sublevel is the kernel version we're starting with and patching
@@ -622,6 +622,8 @@ Patch665: netfilter-x_tables-deal-with-bogus-nextoffset-values.patch
 #CVE-2016-3135 rhbz 1318172 1318270
 Patch666: ipv4-Dont-do-expensive-useless-work-during-inetdev-des.patch
 
+Patch667: 0001-Temp-fix-for-intel_pstate-oopses-and-lockdep-report-.patch
+
 # END OF PATCH DEFINITIONS
 
 %endif
@@ -2143,6 +2145,10 @@ fi
 #
 # 
 %changelog
+* Thu Mar 17 2016 Josh Boyer <jwboyer@fedoraproject.org>
+- Add temporary patch to fix intel_pstate oops and lockdep report on
+  various atom based CPUs.
+
 * Thu Mar 17 2016 Josh Boyer <jwboyer@fedoraproject.org> - 4.6.0-0.rc0.git7.1
 - Linux v4.5-2535-g09fd671ccb24
 - fbdev, media, libnvdimm, dm, scsi, ibft merges