From 2b06ac867176d5d24757bda7e13f6255d6b96d7b Mon Sep 17 00:00:00 2001 From: "H. Peter Anvin" Date: Mon, 4 Feb 2008 16:47:59 +0100 Subject: x86: cpuid, msr: use inode mutex instead of big kernel lock Instead of grabbing the BKL on seek, use the inode mutex in the style of generic_file_llseek(). Signed-off-by: H. Peter Anvin Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- arch/x86/kernel/cpuid.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) (limited to 'arch/x86/kernel/cpuid.c') diff --git a/arch/x86/kernel/cpuid.c b/arch/x86/kernel/cpuid.c index c10ebc4b8e4b..288e7a6598ac 100644 --- a/arch/x86/kernel/cpuid.c +++ b/arch/x86/kernel/cpuid.c @@ -62,9 +62,9 @@ static void cpuid_smp_cpuid(void *cmd_block) static loff_t cpuid_seek(struct file *file, loff_t offset, int orig) { loff_t ret; + struct inode *inode = file->f_mapping->host; - lock_kernel(); - + mutex_lock(&inode->i_mutex); switch (orig) { case 0: file->f_pos = offset; @@ -77,8 +77,7 @@ static loff_t cpuid_seek(struct file *file, loff_t offset, int orig) default: ret = -EINVAL; } - - unlock_kernel(); + mutex_unlock(&inode->i_mutex); return ret; } -- cgit