[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <4F606F13.1040704@siemens.com>
Date: Wed, 14 Mar 2012 11:12:35 +0100
From: Jan Kiszka <jan.kiszka@...mens.com>
To: Eric B Munson <emunson@...bm.net>
CC: avi@...hat.com, mingo@...hat.com, hpa@...or.com,
ryanh@...ux.vnet.ibm.com, aliguori@...ibm.com, mtosatti@...hat.com,
kvm@...r.kernel.org, linux-arch@...r.kernel.org, x86@...nel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4 V16] Add functions to check if the host has stopped
the vm
On 2012-03-10 20:37, Eric B Munson wrote:
> When a host stops or suspends a VM it will set a flag to show this. The
> watchdog will use these functions to determine if a softlockup is real, or the
> result of a suspended VM.
>
...
> diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c
> index f8492da..4ba090c 100644
> --- a/arch/x86/kernel/kvmclock.c
> +++ b/arch/x86/kernel/kvmclock.c
> @@ -22,6 +22,7 @@
> #include <asm/msr.h>
> #include <asm/apic.h>
> #include <linux/percpu.h>
> +#include <linux/hardirq.h>
>
> #include <asm/x86_init.h>
> #include <asm/reboot.h>
> @@ -114,6 +115,26 @@ static void kvm_get_preset_lpj(void)
> preset_lpj = lpj;
> }
>
> +bool kvm_check_and_clear_guest_paused(void)
> +{
> + bool ret = false;
> + struct pvclock_vcpu_time_info *src;
> +
> + /*
> + * per_cpu() is safe here because this function is only called from
> + * timer functions where preemption is already disabled.
> + */
> + WARN_ON(!in_atomic());
> + src = &__get_cpu_var(hv_clock);
> + if ((src->flags & PVCLOCK_GUEST_STOPPED) != 0) {
> + __this_cpu_and(hv_clock.flags, ~PVCLOCK_GUEST_STOPPED);
> + ret = true;
> + }
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(kvm_check_and_clear_guest_paused);
Which module is going to use this? I failed to find it, but I may have
missed something.
The actual reason for this reply: this patches causes a compiler warning
here, likely due to lacking include for EXPORT_SYMBOL_GPL:
CC arch/x86/kernel/kvmclock.o
/data/linux-kvm/arch/x86/kernel/kvmclock.c:136:1: warning: data
definition has no type or storage class
/data/linux-kvm/arch/x86/kernel/kvmclock.c:136:1: warning: type defaults
to ‘int’ in declaration of ‘EXPORT_SYMBOL_GPL’
/data/linux-kvm/arch/x86/kernel/kvmclock.c:136:1: warning: parameter
names (without types) in function declaration
Jan
--
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists