Re: [patch V4 part 4 02/24] x86/int3: Avoid atomic instrumentation

[Peter Zijlstra]

On Wed, May 13, 2020 at 09:57:52PM -0700, Andy Lutomirski wrote:
> On Tue, May 5, 2020 at 7:15 AM Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote:
> >
> > From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> >
> > Use arch_atomic_*() and READ_ONCE_NOCHECK() to ensure nothing untoward
> > creeps in and ruins things.
> >
> > That is; this is the INT3 text poke handler, strictly limit the code
> > that runs in it, lest it inadvertenly hits yet another INT3.
> 
> 
> Acked-by: Andy Lutomirski <luto@xxxxxxxxxx>
> 
> Does objtool catch this error?

It does not. I'll put it on the (endless) todo list..