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

Stephen Rothwell
2015-04-15T02:30:32Z

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Hi Len,

On Mon, 13 Apr 2015 14:24:42 +1000 Stephen Rothwell <sfr@canb.auug.org.au> wrote:
>
> 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 <sfr@canb.auug.org.au>
> 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 <sfr@canb.auug.org.au>
> ---
> 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)

This is now required after the merge of the idle tree (since the code
was removed from the pm tree).

--
Cheers,
Stephen Rothwell sfr@canb.auug.org.au

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