linux-kernel - Re: [tip:irq/irqdomain] irqdomain: Introduce helper function irq_domain_add

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Message-ID: <5479E467.5070701@linux.intel.com>
Date:	Sat, 29 Nov 2014 23:21:11 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Borislav Petkov <bp@...en8.de>
CC:	linux-tip-commits@...r.kernel.org, matthias.bgg@...il.com,
	tony.luck@...el.com, tglx@...utronix.de, benh@...nel.crashing.org,
	linux-kernel@...r.kernel.org, hpa@...or.com,
	grant.likely@...aro.org, wangyijing@...wei.com,
	marc.zyngier@....com, bhelgaas@...gle.com,
	yingjoe.chen@...iatek.com, mingo@...nel.org
Subject: Re: [tip:irq/irqdomain] irqdomain: Introduce helper function irq_domain_add_hierarchy()

On 2014/11/29 22:56, Borislav Petkov wrote:
> On Sat, Nov 29, 2014 at 10:29:33PM +0800, Jiang Liu wrote:
>>  Thanks for reporting and fixing this. How about using GFP_ATOMIC
>> here?
> 
> Well, I don't see the need to use GFP_ATOMIC if we absolutely don't have
> to. And in this case lockdep is, AFAICT, correct in saying that we still
> can do allocations with interrupts disabled, only not go down into fs
> and do all kinds of lock grabbing operations like page reclaim, writeout
> or whatever it is being done nowadays there.
> 
> Yeah, this is also some old "no-no" in my memory which says that we
> should almost never use GFP_ATOMIC if it can be helped.
Thanks for the info about GFP_ATOMIC, originally I have an impression
that we should use GFP_ATOMIC when interrupt is disabled:(

> 
> OTOH, I wonder if this code would rather need to hand down explicit gfp
> flags in case it should be able to do GFP_ATOMIC operations at some
> point...
> 
> Thanks.
> 
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