diff options
| author |   H. Peter Anvin <hpa@zytor.com> | 2008-02-04 16:47:59 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2008-02-04 16:47:59 +0100 |
| commit | 2b06ac867176d5d24757bda7e13f6255d6b96d7b (patch) | |
| tree | 3a9b1e802b46dfc494f50031e51d118724bf9fa6 /arch/x86 | |
| parent | x86: cpuid: allow querying %ecx-sensitive CPUID levels (diff) | |
| download | linux-dev-2b06ac867176d5d24757bda7e13f6255d6b96d7b.tar.xz linux-dev-2b06ac867176d5d24757bda7e13f6255d6b96d7b.zip | |
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 <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kernel/cpuid.c | 7 | ||||
| -rw-r--r-- | arch/x86/kernel/msr.c | 14 |
2 files changed, 12 insertions, 9 deletions
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; } diff --git a/arch/x86/kernel/msr.c b/arch/x86/kernel/msr.c index bd82850e6519..af51ea8400b2 100644 --- a/arch/x86/kernel/msr.c +++ b/arch/x86/kernel/msr.c @@ -1,6 +1,6 @@ /* ----------------------------------------------------------------------- * - * - * Copyright 2000 H. Peter Anvin - All Rights Reserved + * + * Copyright 2000-2008 H. Peter Anvin - All Rights Reserved * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -45,9 +45,10 @@ static struct class *msr_class; static loff_t msr_seek(struct file *file, loff_t offset, int orig) { - loff_t ret = -EINVAL; + 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; @@ -56,8 +57,11 @@ static loff_t msr_seek(struct file *file, loff_t offset, int orig) case 1: file->f_pos += offset; ret = file->f_pos; + break; + default: + ret = -EINVAL; } - unlock_kernel(); + mutex_unlock(&inode->i_mutex); return ret; } |