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

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Date:	Thu, 28 Jun 2012 17:54:30 +0800
From:	Yanfei Zhang <zhangyanfei@...fujitsu.com>
To:	Greg KH <gregkh@...uxfoundation.org>
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

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
+
 #ifdef CONFIG_SYSFS_DEPRECATED
 #ifdef CONFIG_SYSFS_DEPRECATED_V2
 long sysfs_deprecated = 1;
@@ -1038,6 +1045,9 @@ int device_add(struct device *dev)
 	error = dpm_sysfs_add(dev);
 	if (error)
 		goto DPMError;
+	error = vmcs_sysfs_add(dev);
+	if (error)
+		goto VMCSError;
 	device_pm_add(dev);
 
 	/* Notify clients of device addition.  This call must come
@@ -1069,6 +1079,8 @@ int device_add(struct device *dev)
 done:
 	put_device(dev);
 	return error;
+ VMCSError:
+	dpm_sysfs_remove(dev);
  DPMError:
 	bus_remove_device(dev);
  BusError:
@@ -1171,6 +1183,7 @@ void device_del(struct device *dev)
 		blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
 					     BUS_NOTIFY_DEL_DEVICE, dev);
 	device_pm_remove(dev);
+	vmcs_sysfs_remove(dev);
 	dpm_sysfs_remove(dev);
 	if (parent)
 		klist_del(&dev->p->knode_parent);
-- 
1.7.1

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