Re: [PATCH] tracing: Cleanup the convoluted softirq tracepoints
From: Thomas Gleixner
Date: Tue Oct 19 2010 - 18:18:37 EST
On Tue, 19 Oct 2010, Thomas Gleixner wrote:
> On Tue, 19 Oct 2010, Jason Baron wrote:
> > > Now even worse, when you NOP out the jmpq then your tracepoint is
> > > still not enabled. Brilliant !
> > >
> >
> > The 'jmpq' in the enabled case is patched with a jmpq to the body of the
> > tracepoint itself.
>
> Brilliant.
IOW, We now jump around the jump which jumps around the disabled code.
Thanks,
tglx
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