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Date: Sun, 29 Mar 2015 19:24:47 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
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Subject: Re: [RFC] vmstat: Avoid waking up idle-cpu to service shepherd work
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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.