linux-kernel - Re: [PATCH] paravirt/locks: avoid modifying static key before jump_label

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Message-ID: <18f454a9-3ed1-7a04-4af3-778281e3958c@cn.fujitsu.com>
Date:   Wed, 25 Oct 2017 16:06:44 +0800
From:   Dou Liyang <douly.fnst@...fujitsu.com>
To:     Juergen Gross <jgross@...e.com>, <linux-kernel@...r.kernel.org>,
        <x86@...nel.org>
CC:     <hpa@...or.com>, <tglx@...utronix.de>, <mingo@...hat.com>,
        <arnd@...db.de>, <peterz@...radead.org>
Subject: Re: [PATCH] paravirt/locks: avoid modifying static key before
 jump_label_init()

Hi Juergen,

>>
>> How about moving the check of xen_pvspin into native_pv_lock_init()
>> like below?
>
> This would leak xen_pvspin to non-Xen code. I'd rather do the

Oops, yes, I made the mistake. Please ignore it.

> static_branch_disable() in xen_init_lock_cpu() if cpu == 0.
>

Yes. I will test it. :-)

Thanks,
	dou.