linux-kernel - Re: RCU bug with v3.17-rc3 ?

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Message-ID: <CAOesGMhokPjb8eU67t9NFOqPU=dBTuFBJ=aC+99i2UvdX_D8Hw@mail.gmail.com>
Date:	Sun, 19 Oct 2014 13:48:12 -0700
From:	Olof Johansson <olof@...om.net>
To:	Felipe Balbi <balbi@...com>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Greg KH <greg@...ah.com>, Rik van Riel <riel@...hat.com>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Tony Lindgren <tony@...mide.com>,
	Linux USB Mailing List <linux-usb@...r.kernel.org>,
	Nathan Lynch <Nathan_Lynch@...tor.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"josh@...htriplett.org" <josh@...htriplett.org>,
	Rabin Vincent <rabin@....in>,
	David Laight <David.Laight@...lab.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Johannes Weiner <hannes@...xchg.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux ARM Kernel Mailing List 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: RCU bug with v3.17-rc3 ?

On Sun, Oct 19, 2014 at 8:28 AM, Felipe Balbi <balbi@...com> wrote:
> Hi,
>
> On Sun, Oct 19, 2014 at 10:54:16AM +0100, Russell King - ARM Linux wrote:
>> On Wed, Oct 15, 2014 at 10:25:13PM +0100, Russell King - ARM Linux wrote:
>> > On Wed, Oct 15, 2014 at 10:23:10PM +0100, Russell King - ARM Linux wrote:
>> > > As I said, I have a patch in progress, but it seems that there needed
>> > > to be some discussion about exactly which compiler versions are affected.
>> > > It seems that it's not as trivial as looking at the GCC bug entry.
>> >
>> > ... and in any case, it has been a known bug for well over a year now,
>> > and it seems that it doesn't affect _that_ many people.  So taking some
>> > extra time to get it properly correct is the _right_ thing to do.
>>
>> Well, this is just great.  Pushing out the change which blacklists these
>> compilers takes out Olof's kernel build system...
>>
>> Things are not as trivial as they seem.
>
> Maybe Olof just needs to update his compiler. Olof ?

Yep, doing a run with 4.9.1 to see how it looks. In the past, 4.9 has
been really noisy with warnings, maybe most of them have been fixed by
now.


-Olof
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