Re: x86-32: Early microcode loading stumbles over disabled DYNAMIC_FTRACE

[H. Peter Anvin]

On 08/30/2013 08:51 AM, Steven Rostedt wrote:
> 
> It does when dynamic tracing is enabled. But this issue is with static
> tracing, there's no code modification, thus all functions call
> mcount/__fentry__ and we need to look at a variable to determine if we
> should trace or not.
> 

And of course global variables are a no-no without special handling in
pre-paging mode.  Sigh.

You *could* bail out of the calling address is < PAGE_OFFSET.

	-hpa

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