[3.11.y.z extended stable] Patch "intel_pstate: Fix type mismatch warning" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    intel_pstate: Fix type mismatch warning

to the linux-3.11.y-queue branch of the 3.11.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.11.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.11.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From 57fe97d66fdef8cfd8f58b521f7d4495129377a9 Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki at intel.com>
Date: Wed, 16 Oct 2013 22:59:33 +0200
Subject: intel_pstate: Fix type mismatch warning

commit 09c87e2f79eb336bd313090be8113ae29345b8f5 upstream.

The expression in line 398 of intel_pstate.c causes the following
warning to be emitted:

drivers/cpufreq/intel_pstate.c:398:3: warning: left shift count >= width of type

which happens because unsigned long is 32-bit on some architectures.

Fix that by using a helper u64 variable and simplify the code
slightly.

Tested-by: Srinivas Pandruvada <srinivas.pandruvada at linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki at intel.com>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/cpufreq/intel_pstate.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index f112f7d..315c6f9 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -383,6 +383,7 @@ static void intel_pstate_get_min_max(struct cpudata *cpu, int *min, int *max)
 static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate)
 {
 	int max_perf, min_perf;
+	u64 val;

 	intel_pstate_get_min_max(cpu, &min_perf, &max_perf);

@@ -394,11 +395,11 @@ static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate)
 	trace_cpu_frequency(pstate * 100000, cpu->cpu);

 	cpu->pstate.current_pstate = pstate;
+	val = pstate << 8;
 	if (limits.no_turbo)
-		wrmsrl(MSR_IA32_PERF_CTL, BIT(32) | (pstate << 8));
-	else
-		wrmsrl(MSR_IA32_PERF_CTL, pstate << 8);
+		val |= (u64)1 << 32;

+	wrmsrl(MSR_IA32_PERF_CTL, val);
 }

 static inline void intel_pstate_pstate_increase(struct cpudata *cpu, int steps)
--
1.8.3.2