linux-kernel - Re: [PATCH v2 1/6] KVM: arm/arm64: arch_timer: Gather KVM specific information in a structure

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Date:	Fri, 19 Feb 2016 10:53:49 +0000
From:	Julien Grall <julien.grall@....com>
To:	Wei Huang <wei@...hat.com>, <kvmarm@...ts.cs.columbia.edu>
CC:	<christoffer.dall@...aro.org>, <marc.zyngier@....com>,
	<fu.wei@...aro.org>, <kvm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <al.stone@...aro.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Gleb Natapov <gleb@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PATCH v2 1/6] KVM: arm/arm64: arch_timer: Gather KVM specific
 information in a structure

Hello Wei,

On 19/02/16 07:24, Wei Huang wrote:
> On 02/11/2016 09:33 AM, Julien Grall wrote:

[...]

>> This is also dropping arch_timer_get_timecounter as it was only used by
>> the KVM code. Furthermore, a stub for the new helper hasn't been
>> introduced because KVM is requiring the arch timer for both ARM64 and
>> ARM32.


[...]

>> -static inline struct timecounter *arch_timer_get_timecounter(void)
>> -{
>> -    return NULL;
>> -}
>> -
>
> Most parts are OK. Regarding removing this function from the #else area,
> is there a possibility to have CONFIG_ARM_ARCH_TIMER=n and CONFIG_KVM=y.
> If so, will the compilation fails here?

This patch is removing arch_timer_get_timecounter. So it's normal to
drop the stub in the #else area.

Furthermore, as mentioned in the commit message, I didn't add a stub for
the new function because KVM mandates the arch timer for both ARM64 and
ARM32.

Regards,

--
Julien Grall
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