linux-kernel - Re: [PATCH 1/2] timer: Avoid waking up an idle-core by migrate running timer

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Message-ID: <20150331145312.GI23123@twins.programming.kicks-ass.net>
Date:	Tue, 31 Mar 2015 16:53:12 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linaro-kernel@...ts.linaro.org, linux-kernel@...r.kernel.org,
	Steven Miao <realmz6@...il.com>
Subject: Re: [PATCH 1/2] timer: Avoid waking up an idle-core by migrate
 running timer

On Tue, Mar 31, 2015 at 12:25:16PM +0530, Viresh Kumar wrote:
> Cc: Steven Miao <realmz6@...il.com>


> +#define TIMER_FLAG_MASK			0x7LU

So Steven, this will break compilation on blackfin because that makes
____cacheline_aligned a NOP while we assume it will generate
__attribute__((__aligned__(SMP_CACHE_BYTES))) with the further
assumption that SMP_CACHE_BYTES >= 8.

Can you explain why blackfin chooses to break ____cacheline_align for
UP? We have the *_in_smp variants to distinguish these cases.
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