linux-kernel - Re: [PATCH] powerpc/book3s32: Only select PPC_HAVE

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Date:	Thu, 03 Sep 2015 19:47:29 +1000
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Christophe Leroy <christophe.leroy@....fr>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>, scottwood@...escale.com,
	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	Joakim Tjernlund <joakim.tjernlund@...nsmode.se>
Subject: Re: [PATCH] powerpc/book3s32: Only select PPC_HAVE_PMU on e600

On Thu, 2015-09-03 at 11:27 +0200, Christophe Leroy wrote:
> On PPC832x, perf record/report reports martian addresses
> 
>      2.62%  perf_reseau4  libpthread-2.18.so  [.] __libc_send
>      2.56%  perf_reseau4  [kernel.kallsyms]   [k] __ip_make_skb
>      1.62%  perf_reseau4  [kernel.kallsyms]   [k] __ip_append_data.isra.39
>      1.55%  perf_reseau4  [kernel.kallsyms]   [k] ip_finish_output
>      1.33%  perf_reseau4  [unknown]           [k] 0x7ffffd94
>      1.33%  perf_reseau4  [unknown]           [k] 0x7ffffd95
>      1.28%  perf_reseau4  [unknown]           [k] 0x7ffffd97
>      1.26%  perf_reseau4  [unknown]           [k] 0x7ffffda3
>      1.24%  perf_reseau4  [unknown]           [k] 0x7ffffd98
>      1.22%  perf_reseau4  [unknown]           [k] 0x7ffffd92
>      1.22%  perf_reseau4  [unknown]           [k] 0x7ffffd9b
>      [.....]
> 
> This is due to function perf_instruction_pointer() reading SPR SIAR
> which doesn't exist on e300 core. The perf_instruction_pointer() is
> redefined in arch/powerpc/perf/core-book3s.c when CONFIG_PPC_PERF_CTRS
> is selected.
> 
> This patch moves the selection of CONFIG_PPC_HAVE_PMU in 86xx section
> so that CONFIG_PPC_PERF_CTRS won't be selected for other 6xx powerpc

I don't know much about these old 6xx cpus, deferring to Paul.

cheers


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