linux-kernel - Re: [RFC PATCH 3/9] irq_work: Force raised irq work to run on irq work interrupt

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Date:	Thu, 4 Sep 2014 17:40:20 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Catalin Iacob <iacobcatalin@...il.com>,
	Dave Jones <davej@...hat.com>, Ingo Molnar <mingo@...nel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC PATCH 3/9] irq_work: Force raised irq work to run on irq
 work interrupt

On Thu, Sep 04, 2014 at 03:33:40PM +0200, Frederic Weisbecker wrote:
> > Why not something like the below; then it becomes a compile time matter.
> 
> Problem is that some archs only have that information at runtime.
> See x86 for example which tests cpu_has_apic.

So the other archs can still benefit, no? Also, on x86 cpu features can
be used with asm_goto/jump_labels, your approach wrecks that too by
copying it into some static variable, see static_cpu_has().
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