Re: [PATCH -tip v2 3/9] ftrace/x86: Support SAVE_REGS feature oni386

[Steven Rostedt]

On Wed, 2012-06-06 at 23:37 +0900, Masami Hiramatsu wrote:

> I agree with Frank. Register restoring should be done as far as the
> ftrace is used for kprobes. Of course, one reason is for the fault
> injection, which is very useful for debugging system failure. And
> another technical reason is that we should do "optimization"
> transparently. IMHO, kprobes works normally doing something,
> optimized kprobes also should do so.
> 
> But if you introduce FTRACE_OPS_FL_RSTR_REGS flag for restoring
> registers, it could be possible to provide corresponding flag
> from kprobes side. (perhaps KPROBE_FLAG_NOMODREGS? :))

That's fine, my patch set restores the regs anyway.

-- Steve


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