Re: [PATCH -tip v2 3/9] ftrace/x86: Support SAVE_REGS feature on i386

[Frank Ch. Eigler]

Hi -

On Tue, Jun 05, 2012 at 04:37:46PM -0400, Steven Rostedt wrote:
> [...]
> I'm not sure we really need to restore all the regs. I'll keep this for
> now, but for an optimization, we can just restore the ones that mcount
> mcount needs to.
> 
> Or do you expect kprobes to change any of theses?

That would be the way for a kprobe to modify variables/values that
happen to be in the registers.  In systemtap, for example:

# stap -g -e 'probe kernel.function("foo") { $bar = 1 }'

- FChE
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