linux-kernel - Re: [RFC] vmstat: Avoid waking up idle-cpu to service shepherd work

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Date:	Sun, 29 Mar 2015 19:24:47 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Christoph Lameter <cl@...ux.com>,
	Linaro Kernel Mailman List <linaro-kernel@...ts.linaro.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	vinmenon@...eaurora.org, shashim@...eaurora.org,
	Michal Hocko <mhocko@...e.cz>, Mel Gorman <mgorman@...e.de>,
	dave@...olabs.net, Konstantin Khlebnikov <koct9i@...il.com>,
	Linux Memory Management List <linux-mm@...ck.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>, realmz6@...il.com
Subject: Re: [RFC] vmstat: Avoid waking up idle-cpu to service shepherd work

On Sun, Mar 29, 2015 at 05:31:32PM +0530, Viresh Kumar wrote:
> Warning:
> 
> config: blackfin-allyesconfig (attached as .config)
> reproduce:
>   wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross
> -O ~/bin/make.cross
>   chmod +x ~/bin/make.cross
>   git checkout ca713e393c6eceb54e803df204772a3d6e6c7981
>   # save the attached .config to linux build tree
>   make.cross ARCH=blackfin
> 
> All error/warnings:
> 
>    kernel/time/timer.c: In function 'init_timers':
> >> kernel/time/timer.c:1648:2: error: call to '__compiletime_assert_1648' declared with attribute error: BUILD_BUG_ON failed: __alignof__(struct tvec_base) & TIMER_FLAG_MASK

Ha, this is because blackfin is broken.

blackfin doesn't respect ____cacheline_aligned and NOPs it for UP
builds. Why it thinks {__,}__cacheline_aligned semantics should differ
between SMP/UP is a mystery to me, we have the &_in_smp primitives for
that.

So just ignore this, let the blackfin people deal with it.
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