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authorAndi Kleen <ak@suse.de>2007-10-10 02:18:27 +0200
committerDave Jones <davej@redhat.com>2007-10-09 21:44:06 -0400
commit9eb59573d4b86f347e6cd04f47a4c2082009fa58 (patch)
tree91209b4149bf791c36ed50da3d0261f491cd27b4 /drivers/cpufreq
parent562d94d98f7032bdc4a99d9124a78a543dbea225 (diff)
downloadop-kernel-dev-9eb59573d4b86f347e6cd04f47a4c2082009fa58.zip
op-kernel-dev-9eb59573d4b86f347e6cd04f47a4c2082009fa58.tar.gz
[CPUFREQ] Don't take semaphore in cpufreq_quick_get()
I don't see any reason to take an expensive lock in cpufreq_quick_get() Reading policy->cur is a single atomic operation and after the lock is dropped again the state could change any time anyways. So don't take the lock in the first place. This also makes this function interrupt safe which is useful for some code of mine. Signed-off-by: Andi Kleen <ak@suse.de> Cc: "Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com> Signed-off-by: Dave Jones <davej@redhat.com>
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r--drivers/cpufreq/cpufreq.c5
1 files changed, 0 insertions, 5 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index e027052..f7b9d6f 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1111,12 +1111,7 @@ unsigned int cpufreq_quick_get(unsigned int cpu)
unsigned int ret_freq = 0;
if (policy) {
- if (unlikely(lock_policy_rwsem_read(cpu)))
- return ret_freq;
-
ret_freq = policy->cur;
-
- unlock_policy_rwsem_read(cpu);
cpufreq_cpu_put(policy);
}
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