linux-kernel - Re: [PATCH 3/4] ptrace: reintroduce __ptrace_detach() as a callee of ptrace

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Message-Id: <20090205203731.1E02BFC381@magilla.sf.frob.com>
Date:	Thu,  5 Feb 2009 12:37:31 -0800 (PST)
From:	Roland McGrath <roland@...hat.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Jerome Marchand <jmarchan@...hat.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] ptrace: reintroduce __ptrace_detach() as a callee
	of ptrace_exit()

> > Given its content, this function now better belongs in ptrace.c, I think.
> 
> I don't completely agree... This helper imho has nothing to do with
> ptracing, except it does __ptrace_unlink(). But OK, I will move it
> if you prefer. 

Obviously where it goes is not a big deal.  But I think it's clear that it
has everything to do with ptrace and nothing to do with anything else.
It resolves a situation that can only arise because of ptrace magic.

> In that case we should export task_detached().

Or just recognize that this trivial wrapper around == -1 has little
value two lines away from a place where = -1 is done explicitly.  
Really, the "abstraction" is more confusing than not in this function, IMHO.

Thanks,
Roland
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