linux-kernel - Re: [PATCH v3 4/5] Sysfs: Export VMCSINFO via sysfs

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Date:	Thu, 28 Jun 2012 04:37:38 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Yanfei Zhang <zhangyanfei@...fujitsu.com>
Cc:	Avi Kivity <avi@...hat.com>, mtosatti@...hat.com,
	ebiederm@...ssion.com, luto@....edu,
	Joerg Roedel <joerg.roedel@....com>, dzickus@...hat.com,
	paul.gortmaker@...driver.com, ludwig.nussel@...e.de,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	kexec@...ts.infradead.org
Subject: Re: [PATCH v3 4/5] Sysfs: Export VMCSINFO via sysfs

On Thu, Jun 28, 2012 at 05:54:30PM +0800, Yanfei Zhang wrote:
> 于 2012年06月28日 03:22, Greg KH 写道:
> > On Wed, Jun 27, 2012 at 04:54:54PM +0800, Yanfei Zhang wrote:
> >> This patch export offsets of fields via /sys/devices/cpu/vmcs/.
> >> Individual offsets are contained in subfiles named by the filed's
> >> encoding, e.g.: /sys/devices/cpu/vmcs/0800
> >>
> >> Signed-off-by: zhangyanfei <zhangyanfei@...fujitsu.com>
> >> ---
> >>  drivers/base/core.c |   13 +++++++++++++
> >>  1 files changed, 13 insertions(+), 0 deletions(-)
> >>
> >> diff --git a/drivers/base/core.c b/drivers/base/core.c
> >> index 346be8b..dd05ee7 100644
> >> --- a/drivers/base/core.c
> >> +++ b/drivers/base/core.c
> >> @@ -26,6 +26,7 @@
> >>  #include <linux/async.h>
> >>  #include <linux/pm_runtime.h>
> >>  #include <linux/netdevice.h>
> >> +#include <asm/vmcsinfo.h>
> > 
> > Did you just break the build on all other arches?  Not nice.
> > 
> >> @@ -1038,6 +1039,11 @@ int device_add(struct device *dev)
> >>  	error = dpm_sysfs_add(dev);
> >>  	if (error)
> >>  		goto DPMError;
> >> +#if defined(CONFIG_KVM_INTEL) || defined(CONFIG_KVM_INTEL_MODULE)
> >> +	error = vmcs_sysfs_add(dev);
> >> +	if (error)
> >> +		goto VMCSError;
> >> +#endif
> > 
> > Oh my no, that's no way to ever do this, you know better than that,
> > please fix.
> > 
> > greg k-h
> > 
> 
> Sorry for my thoughtless, Here is the new patch.
> 
> ---
>  drivers/base/core.c |   13 +++++++++++++
>  1 files changed, 13 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/base/core.c b/drivers/base/core.c
> index 346be8b..7b5266a 100644
> --- a/drivers/base/core.c
> +++ b/drivers/base/core.c
> @@ -30,6 +30,13 @@
>  #include "base.h"
>  #include "power/power.h"
>  
> +#if defined(CONFIG_KVM_INTEL) || defined(CONFIG_KVM_INTEL_MODULE)
> +#include <asm/vmcsinfo.h>
> +#else
> +static inline int vmcs_sysfs_add(struct device *dev) { return 0; }
> +static inline void vmcs_sysfs_remove(struct device *dev) { }
> +#endif

{sigh}  No, again, you know better, don't do this.

greg k-h
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