linux-kernel - Re: [PATCH] mm/migrate: Mark unmap_and_move() "noinline" to avoid ICE in gcc 4.7.3

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Message-ID: <20150401215950.GC4027@n2100.arm.linux.org.uk>
Date:	Wed, 1 Apr 2015 22:59:50 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Kevin Hilman <khilman@...nel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Marc Zyngier <marc.zyngier@....com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Will Deacon <Will.Deacon@....com>,
	Simon Horman <horms@...ge.net.au>,
	Tyler Baker <tyler.baker@...aro.org>,
	Nishanth Menon <nm@...com>, Arnd Bergmann <arnd@...db.de>,
	"linux-sh@...r.kernel.org" <linux-sh@...r.kernel.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Magnus Damm <magnus.damm@...il.com>,
	"grygorii.strashko@...aro.org" <grygorii.strashko@...aro.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH] mm/migrate: Mark unmap_and_move() "noinline" to avoid
 ICE in gcc 4.7.3

On Wed, Apr 01, 2015 at 02:54:59PM -0700, Kevin Hilman wrote:
> Your patch on top of Geert's still compiles fine for me with gcc-4.7.3.
> However, I'm not sure how specific we can be on the versions.  
> 
> /me goes to test a few more compilers...   OK...
> 
> ICE: 4.7.1, 4.7.3, 4.8.3
> OK: 4.6.3, 4.9.2, 4.9.3
> 
> The diff below[2] on top of yours compiles fine here and at least covers
> the compilers I *know* to trigger the ICE.

Interesting.  I'm using stock gcc 4.7.4 here, though I'm not building
-next (only mainline + my tree + arm-soc) and it hasn't shown a problem
yet.

I think we need to ask the question: is the bug in stock GCC or Linaro
GCC?  If it's not in stock GCC, then it's a GCC vendor problem :)

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