linux-kernel - Re: [PATCH] x86/xen: use schedule_timeout

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Date:	Fri, 29 May 2015 10:44:33 -0400
From:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:	Nicholas Mc Guire <hofrat@...dl.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	David Vrabel <david.vrabel@...rix.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/xen: use schedule_timeout_interruptible()

On 05/29/2015 09:49 AM, Nicholas Mc Guire wrote:
> API consolidation with coccinelle found:
> ./arch/x86/xen/smp.c:499:2-18:
>          consolidation with schedule_timeout_*() recommended
>
> This is a 1:1 conversion of the current calls to an available helper
> only - so only an API consolidation to improve readability.
>
> Patch was compile tested with x86_64_defconfig +
> CONFIG_HYPERVISOR_GUEST=y,CONFIG_PARAVIRT=y,CONFIG_XEN=y:
>
> Patch is against 4.1-rc5 (localversion-next is -next-20150529)
>
> Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>

Reviewed-by: Boris Ostrovsky < boris.ostrovsky@...cle.com>

> ---
>   arch/x86/xen/smp.c |    6 ++----
>   1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
> index 8648438..6cbbfc8 100644
> --- a/arch/x86/xen/smp.c
> +++ b/arch/x86/xen/smp.c
> @@ -494,10 +494,8 @@ static int xen_cpu_disable(void)
>   
>   static void xen_cpu_die(unsigned int cpu)
>   {
> -	while (xen_pv_domain() && HYPERVISOR_vcpu_op(VCPUOP_is_up, cpu, NULL)) {
> -		__set_current_state(TASK_UNINTERRUPTIBLE);
> -		schedule_timeout(HZ/10);
> -	}
> +	while (xen_pv_domain() && HYPERVISOR_vcpu_op(VCPUOP_is_up, cpu, NULL))
> +		schedule_timeout_uninterruptible(msecs_to_jiffies(100));
>   
>   	if (common_cpu_die(cpu) == 0) {
>   		xen_smp_intr_free(cpu);

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