linux-kernel - Re: current_thread_info() not respecting program order with gcc 4.8.x

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Date:	Fri, 22 Nov 2013 01:34:05 +0100
From:	Alexander Holler <holler@...oftware.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Jakub Jelinek <jakub@...hat.com>,
	Richard Henderson <rth@...ddle.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Will Deacon <will.deacon@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Peter Zijlstra <peterz@...radead.org>,
	lttng-dev@...ts.lttng.org, Nathan Lynch <Nathan_Lynch@...tor.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Luis Lozano <llozano@...omium.org>,
	Bhaskar Janakiraman <bjanakiraman@...omium.org>,
	Han Shen <shenhan@...omium.org>
Subject: Re: current_thread_info() not respecting program order with gcc 4.8.x

Am 22.11.2013 01:17, schrieb Linus Torvalds:
> On Thu, Nov 21, 2013 at 3:18 PM, Alexander Holler <holler@...oftware.de> wrote:

> Basically, your whole argument boils down to "if the function did
> something else than what it does, then it wouldn't be const, so we
> shouldn't mark it const". But that argument is BULLSHIT, because the
> fact is, the function *doesn't* do what you try to claim it does.

Maybe gcc just makes the same false conclusion as I did in my description.

I read it as current_thread_info() returns "a pointer to something 
local" instead of returns "a pointer". Might be BULLSHIT but would 
explain the bug which seems to exist.

Alexander Holler

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