linux-kernel - Re: [v4,4/4] powernv: powerpc: Add winkle support for offline cpus

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Date:	Sun, 14 Dec 2014 21:05:59 +1100 (AEDT)
From:	Michael Ellerman <mpe@...erman.id.au>
To:	"Shreyas B. Prabhu" <shreyas@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Cc:	"Shreyas B. Prabhu" <shreyas@...ux.vnet.ibm.com>,
	linuxppc-dev@...ts.ozlabs.org, Paul Mackerras <paulus@...ba.org>
Subject: Re: [v4,4/4] powernv: powerpc: Add winkle support for offline cpus

On Tue, 2014-09-12 at 18:56:53 UTC, "Shreyas B. Prabhu" wrote:
> Winkle is a deep idle state supported in power8 chips. A core enters
> winkle when all the threads of the core enter winkle. In this state
> power supply to the entire chiplet i.e core, private L2 and private L3
> is turned off. As a result it gives higher powersavings compared to
> sleep.
...

> diff --git a/arch/powerpc/platforms/powernv/subcore.h b/arch/powerpc/platforms/powernv/subcore.h
> index 148abc9..604eb40 100644
> --- a/arch/powerpc/platforms/powernv/subcore.h
> +++ b/arch/powerpc/platforms/powernv/subcore.h
> @@ -15,4 +15,5 @@
>  
>  #ifndef __ASSEMBLY__
>  void split_core_secondary_loop(u8 *state);
> +extern void update_subcore_sibling_mask(void);
>  #endif

subcore.c isn't built for CONFIG_SMP=n, resulting in:

  setup.c:(.init.text+0x34b0): undefined reference to `.update_subcore_sibling_mask'

I needed to add:

+#else
+static inline void update_subcore_sibling_mask(void) { };
+#endif /* CONFIG_SMP */


I also got quite a few conflicts, with this and the previous patch, mainly in
the paca and asm-offsets. Please check I resolved them correctly:

  https://github.com/mpe/powerpc-merge/commits/test

cheers
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