Re: [PATCH] ftrace: powerpc: remove startup functions from tracing

From: Benjamin Herrenschmidt
Date: Thu Oct 16 2008 - 20:52:33 EST

On Thu, 2008-10-16 at 20:48 -0400, Steven Rostedt wrote:
> The early init code in PowerPC is not mapped to their final locations
> and all jumps and memory references must be done with relative jumps
> and accesses.
> The lib files in the powerpc directory are called in early boot, and
> since mcount will perform direct access to memory, the lib files need
> not be traced.

This is annoying though, because that means things like memcpy,
copy_to_from_user etc... can't be traced. On the other hand a lot
of that is asm and already doesn't call mcount.


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