linux-kernel - Re: [PATCH 3.17 00/25] 3.17.1-stable review

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Message-ID: <pan.2014.11.19.20.19.40@googlemail.com>
Date:	Wed, 19 Nov 2014 20:19:40 +0000 (UTC)
From:	Holger Hoffstätte 
	<holger.hoffstaette@...glemail.com>
To:	linux-kernel@...r.kernel.org
Cc:	stable@...r.kernel.org
Subject: Re: [PATCH 3.17 00/25] 3.17.1-stable review

On Wed, 19 Nov 2014 11:44:14 -0800, Paul E. McKenney wrote:

> On Wed, Nov 19, 2014 at 09:22:35AM -0800, Greg Kroah-Hartman wrote:
>> 
>> Doesn't build in 3.17 properly :(
> 
> Older kernels can use rcu_note_context_switch() instead of
> rcu_note_voluntary_context_switch(), which didn't show up until quite
> recently.  Please note that rcu_note_context_switch() is quite a bit
> more heavy-weight than is rcu_note_voluntary_context_switch(), but it
> should be OK in this context.

When I tried this in 3.14.x the kernel would lock up immediately during
boot (not even a console). This may or may not have to do with me also
using the BFS scheduler, but it's IMHO something that should be
double-checked.

I also tried to backport the necessary macros but that went nowhere
fast, since they ended up pulling in most of the rcu-task stuff..

-h

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