Subject: linux-next: build failure after merge of the pm tree

From: Stephen Rothwell <[email-masked]>
Date: Mon, 13 Apr 2015 14:24:42 +1000

Hi Rafael,

After merging the pm tree, today's linux-next build (x86_64 allmodconfig)
failed like this:

In file included from arch/x86/include/asm/msr.h:131:0,
                 from arch/x86/include/asm/processor.h:20,
                 from arch/x86/include/asm/thread_info.h:23,
                 from include/linux/thread_info.h:54,
                 from arch/x86/include/asm/preempt.h:6,
                 from include/linux/preempt.h:18,
                 from include/linux/smp.h:55,
                 from include/linux/kernel_stat.h:4,
                 from drivers/cpufreq/intel_pstate.c:14:
drivers/cpufreq/intel_pstate.c: In function 'knl_get_turbo_pstate':
drivers/cpufreq/intel_pstate.c:622:9: error: 'MSR_NHM_TURBO_RATIO_LIMIT' undeclared (first use in this function)
  rdmsrl(MSR_NHM_TURBO_RATIO_LIMIT, value);
         ^
arch/x86/include/asm/paravirt.h:153:26: note: in definition of macro 'rdmsrl'
  val = paravirt_read_msr(msr, &_err); \
                          ^
drivers/cpufreq/intel_pstate.c:622:9: note: each undeclared identifier is reported only once for each function it appears in
  rdmsrl(MSR_NHM_TURBO_RATIO_LIMIT, value);
         ^
arch/x86/include/asm/paravirt.h:153:26: note: in definition of macro 'rdmsrl'
  val = paravirt_read_msr(msr, &_err); \
                          ^

Caused by commit 6acfd09a439a ("tools/power turbostat: define and dump
MSR_TURBO_RATIO_LIMIT2") interacting with commit b34ef932d79a
("intel_pstate: Knights Landing support").  This should have been
resolved in commit 08fb40f3fbeb ("Merge branches 'powercap' and
'pm-tools'").

I have added the following patch for today:

From: Stephen Rothwell <[email-masked]>
Date: Mon, 13 Apr 2015 14:11:11 +1000
Subject: [PATCH] intel_pstate: fix bad merge (MSR_NHM_TURBO_RATIO_LIMIT rename)

Signed-off-by: Stephen Rothwell <[email-masked]>
---
 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 875154d5f60b..5ecd2689a8fc 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -619,7 +619,7 @@ static int knl_get_turbo_pstate(void)
 	u64 value;
 	int nont, ret;
 
-	rdmsrl(MSR_NHM_TURBO_RATIO_LIMIT, value);
+	rdmsrl(MSR_TURBO_RATIO_LIMIT, value);
 	nont = core_get_max_pstate();
 	ret = (((value) >> 8) & 0xFF);
 	if (ret <= nont)
-- 
2.1.4

-- 
Cheers,
Stephen Rothwell                    [email-masked]