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Message-ID: <20131220213348.GE7959@laptop.programming.kicks-ass.net>
Date: Fri, 20 Dec 2013 22:33:48 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Oleg Nesterov <oleg@...hat.com>
Cc: Richard Guy Briggs <rgb@...hat.com>, linux-audit@...hat.com,
linux-kernel@...r.kernel.org, Eric Paris <eparis@...hat.com>
Subject: Re: [PATCH] pid: change task_struct::pid to read-only
On Fri, Dec 20, 2013 at 08:01:57PM +0100, Oleg Nesterov wrote:
> The only problem is that
>
> #define ASSIGN_CONST(l, r) (*(typeof(r) *)&(l) = (r))
>
> obviously can't work in this case ;) We need something more clever.
Hmm indeed, C++ has both the const_cast<>() thingy and the template
system is powerful enough to actually implement const_cast<>() inside
the language.
But I cannot find anything useful for C. Your attempt to use the rvalue
type to hopefully obtain a const-less lvalue type is clever, but does
indeed fail where the rvalue is const too.
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