Re: [RFC PATCH 3/6] perf: Generalize some arch callchain code

[Paul Mackerras]

On Mon, Aug 16, 2010 at 10:48:32PM +0200, Frederic Weisbecker wrote:

> - Most archs use one callchain buffer per cpu, except x86 that needs
>   to deal with NMIs. Provide a default perf_callchain_buffer()
>   implementation that x86 overrides.
> 
> - Centralize all the kernel/user regs handling and invoke new arch
>   handlers from there: perf_callchain_user() / perf_callchain_kernel()
>   That avoid all the user_mode(), current->mm checks and so...
> 
> - Invert some parameters in perf_callchain_*() helpers: entry to the
>   left, regs to the right, following the traditional (src, dst).

I think you mean (dst, src), don't you?

Apart from that, the patch looks OK, so

Acked-by: Paul Mackerras <paulus@xxxxxxxxx>

Paul.
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