linux-kernel - [PATCH] Change x86 Machine check handler to use unlocked

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Date:	Thu, 10 Jan 2008 11:25:14 +0530
From:	Nikanth Karthikesan <knikanth@...e.de>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] Change x86 Machine check handler to use unlocked_iocl instead
 of ioctl

The Machine check handler registers ioctl handler that is called
with the BKL held. Changing to register unlocked_ioctl instead.
Also mce ioctl handler does not seem to need any lock protection.

To: Andi Kleen <andi@...stfloor.org>
Cc: linux-kernel@...r.kernel.org
Cc: kernel-janitors@...r.kernel.org

Change the Machine check handler to use unlocked_ioctl instead of
ioctl handler. Also the mce ioctl handler does not need any lock
protection.

Signed-off-by: Nikanth Karthikesan <knikanth@...e.de>

---

diff --git a/arch/x86/kernel/cpu/mcheck/mce_64.c
b/arch/x86/kernel/cpu/mcheck/mce_64.c
index 4b21d29..d3baa62 100644
--- a/arch/x86/kernel/cpu/mcheck/mce_64.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_64.c
@@ -634,8 +634,7 @@ static unsigned int mce_poll(struct file *file,
poll_table *wait)
 	return 0;
 }

-static int mce_ioctl(struct inode *i, struct file *f,unsigned int cmd,
-		     unsigned long arg)
+static long mce_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
 {
 	int __user *p = (int __user *)arg;

@@ -664,7 +663,7 @@ static const struct file_operations mce_chrdev_ops = {
 	.release = mce_release,
 	.read = mce_read,
 	.poll = mce_poll,
-	.ioctl = mce_ioctl,
+	.unlocked_ioctl = mce_ioctl,
 };

 static struct miscdevice mce_log_device = {
--
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