linux-kernel - Re: PT

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Date:	Wed, 22 Apr 2009 23:39:49 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	jdike@...toit.com, linux-kernel@...r.kernel.org,
	user-mode-linux-devel@...ts.sourceforge.net
Subject: Re: PT_DTRACE && uml

> (cc Jeff Dike)

I've also CC'd the UML hackers' mailing list.

> So, arch/um/ seems to be the only user of PT_DTRACE.
> 
> I do not understand this code at all. It looks as if we can just
> s/PT_DTRACE/TIF_SINGLESTEP/.
> 
> But it can't be that simple?

I don't really understand off hand how UML is using PT_DTRACE either.
But clearly it (or any real arch) that needs a flag for an arch purpose
can use a TIF_* bit instead of touching ->ptrace, and should do that.


Thanks,
Roland
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