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| author | John Kacur <jkacur@gmail.com> | 2008-09-02 14:36:13 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-09-02 19:21:40 -0700 |
| commit | 9d3593574702ae1899e23a1535da1ac71f928042 (patch) | |
| tree | 0ea17d5e2a922df5e1d2f52c545728084afee78c /fs/pipe.c | |
| parent | 74c4633da7994eddcfcd2762a448c6889cc2b5bd (diff) | |
| download | op-kernel-dev-9d3593574702ae1899e23a1535da1ac71f928042.zip op-kernel-dev-9d3593574702ae1899e23a1535da1ac71f928042.tar.gz | |
pm_qos_requirement might sleep
Make PM_QOS and CPU_IDLE play nicer when run with the RT-Preempt kernel.
The purpose of the patch is to remove the spin_lock around the read in the
function pm_qos_requirement - since spinlocks can sleep in -rt and this
function is called from idle.
CPU_IDLE polls the target_value's of some of the pm_qos parameters from
the idle loop causing sleeping locking warnings. Changing the
target_value to an atomic avoids this issue.
Remove the spinlock in pm_qos_requirement by making target_value an atomic
type.
Signed-off-by: mark gross <mgross@linux.intel.com>
Signed-off-by: John Kacur <jkacur@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/pipe.c')
0 files changed, 0 insertions, 0 deletions
