Re: [PATCH] cpufreq, powernv: Fix build failure on UP

[Viresh Kumar]

On 16 April 2014 11:18, Srivatsa S. Bhat
<srivatsa.bhat@xxxxxxxxxxxxxxxxxx> wrote:
> From: Srivatsa S. Bhat <srivatsa.bhat@xxxxxxxxxxxxxxxxxx>
> Subject: [PATCH] cpufreq, powernv: Fix build failure on UP
>
> Paul Gortmaker reported the following build failure of the powernv cpufreq
> driver on UP configs:
>
> drivers/cpufreq/powernv-cpufreq.c:241:2: error: implicit declaration of
> function 'cpu_sibling_mask' [-Werror=implicit-function-declaration]
> cc1: some warnings being treated as errors
> make[3]: *** [drivers/cpufreq/powernv-cpufreq.o] Error 1
> make[2]: *** [drivers/cpufreq] Error 2
> make[1]: *** [drivers] Error 2
> make: *** [sub-make] Error 2
>
> The trouble here is that cpu_sibling_mask is defined only in <asm/smp.h>, and
> <linux/smp.h> includes <asm/smp.h> only in SMP builds.
>
> So fix this build failure by explicitly including <asm/smp.h> in the driver,
> so that we get the definition of cpu_sibling_mask even in UP configurations.
>
> Reported-by: Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx>
> Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@xxxxxxxxxxxxxxxxxx>
> ---
>
>  drivers/cpufreq/powernv-cpufreq.c |    1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/cpufreq/powernv-cpufreq.c b/drivers/cpufreq/powernv-cpufreq.c
> index 9edccc6..ed1c7e5 100644
> --- a/drivers/cpufreq/powernv-cpufreq.c
> +++ b/drivers/cpufreq/powernv-cpufreq.c
> @@ -29,6 +29,7 @@
>
>  #include <asm/cputhreads.h>
>  #include <asm/reg.h>

Probably a comment here ?, so that people don't try to remove it in future.

/* Required for cpu_sibling_mask() in UP configurations */

> +#include <asm/smp.h>
>
>  #define POWERNV_MAX_PSTATES    256

Acked-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
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