aboutsummaryrefslogtreecommitdiff
path: root/Documentation
diff options
context:
space:
mode:
authorNicolas Pitre <nicolas.pitre@linaro.org>2011-11-11 21:27:03 -0500
committerNicolas Pitre <nicolas.pitre@linaro.org>2011-11-11 21:27:03 -0500
commitc2fdcfc81097255816194a584e6faabd3914cfc5 (patch)
treefd8cbf72bf3d38a6d09e4dbbeaa4dd47a04b8f49 /Documentation
parentf171dfebbdf1de4b6ca267285739e190f95f84cc (diff)
parentb48635635c1a696aea6423ec6c547c8c7bbf7aab (diff)
downloadlinux-linaro-precise-c2fdcfc81097255816194a584e6faabd3914cfc5.tar.gz
Merge commit 'v3.1.1' into linaro-3.1
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/hwspinlock.txt18
-rw-r--r--Documentation/power/runtime_pm.txt10
-rw-r--r--Documentation/stable_kernel_rules.txt14
3 files changed, 24 insertions, 18 deletions
diff --git a/Documentation/hwspinlock.txt b/Documentation/hwspinlock.txt
index 7dcd1a4e726..69966813d59 100644
--- a/Documentation/hwspinlock.txt
+++ b/Documentation/hwspinlock.txt
@@ -39,23 +39,20 @@ independent, drivers.
in case an unused hwspinlock isn't available. Users of this
API will usually want to communicate the lock's id to the remote core
before it can be used to achieve synchronization.
- Can be called from an atomic context (this function will not sleep) but
- not from within interrupt context.
+ Should be called from a process context (might sleep).
struct hwspinlock *hwspin_lock_request_specific(unsigned int id);
- assign a specific hwspinlock id and return its address, or NULL
if that hwspinlock is already in use. Usually board code will
be calling this function in order to reserve specific hwspinlock
ids for predefined purposes.
- Can be called from an atomic context (this function will not sleep) but
- not from within interrupt context.
+ Should be called from a process context (might sleep).
int hwspin_lock_free(struct hwspinlock *hwlock);
- free a previously-assigned hwspinlock; returns 0 on success, or an
appropriate error code on failure (e.g. -EINVAL if the hwspinlock
is already free).
- Can be called from an atomic context (this function will not sleep) but
- not from within interrupt context.
+ Should be called from a process context (might sleep).
int hwspin_lock_timeout(struct hwspinlock *hwlock, unsigned int timeout);
- lock a previously-assigned hwspinlock with a timeout limit (specified in
@@ -232,15 +229,14 @@ int hwspinlock_example2(void)
int hwspin_lock_register(struct hwspinlock *hwlock);
- to be called from the underlying platform-specific implementation, in
- order to register a new hwspinlock instance. Can be called from an atomic
- context (this function will not sleep) but not from within interrupt
- context. Returns 0 on success, or appropriate error code on failure.
+ order to register a new hwspinlock instance. Should be called from
+ a process context (this function might sleep).
+ Returns 0 on success, or appropriate error code on failure.
struct hwspinlock *hwspin_lock_unregister(unsigned int id);
- to be called from the underlying vendor-specific implementation, in order
to unregister an existing (and unused) hwspinlock instance.
- Can be called from an atomic context (will not sleep) but not from
- within interrupt context.
+ Should be called from a process context (this function might sleep).
Returns the address of hwspinlock on success, or NULL on error (e.g.
if the hwspinlock is sill in use).
diff --git a/Documentation/power/runtime_pm.txt b/Documentation/power/runtime_pm.txt
index 6066e3a6b9a..d3710dc6d25 100644
--- a/Documentation/power/runtime_pm.txt
+++ b/Documentation/power/runtime_pm.txt
@@ -782,6 +782,16 @@ will behave normally, not taking the autosuspend delay into account.
Similarly, if the power.use_autosuspend field isn't set then the autosuspend
helper functions will behave just like the non-autosuspend counterparts.
+Under some circumstances a driver or subsystem may want to prevent a device
+from autosuspending immediately, even though the usage counter is zero and the
+autosuspend delay time has expired. If the ->runtime_suspend() callback
+returns -EAGAIN or -EBUSY, and if the next autosuspend delay expiration time is
+in the future (as it normally would be if the callback invoked
+pm_runtime_mark_last_busy()), the PM core will automatically reschedule the
+autosuspend. The ->runtime_suspend() callback can't do this rescheduling
+itself because no suspend requests of any kind are accepted while the device is
+suspending (i.e., while the callback is running).
+
The implementation is well suited for asynchronous use in interrupt contexts.
However such use inevitably involves races, because the PM core can't
synchronize ->runtime_suspend() callbacks with the arrival of I/O requests.
diff --git a/Documentation/stable_kernel_rules.txt b/Documentation/stable_kernel_rules.txt
index e213f45cf9d..21fd05c28e7 100644
--- a/Documentation/stable_kernel_rules.txt
+++ b/Documentation/stable_kernel_rules.txt
@@ -24,10 +24,10 @@ Rules on what kind of patches are accepted, and which ones are not, into the
Procedure for submitting patches to the -stable tree:
- Send the patch, after verifying that it follows the above rules, to
- stable@kernel.org. You must note the upstream commit ID in the changelog
- of your submission.
+ stable@vger.kernel.org. You must note the upstream commit ID in the
+ changelog of your submission.
- To have the patch automatically included in the stable tree, add the tag
- Cc: stable@kernel.org
+ Cc: stable@vger.kernel.org
in the sign-off area. Once the patch is merged it will be applied to
the stable tree without anything else needing to be done by the author
or subsystem maintainer.
@@ -35,10 +35,10 @@ Procedure for submitting patches to the -stable tree:
cherry-picked than this can be specified in the following format in
the sign-off area:
- Cc: <stable@kernel.org> # .32.x: a1f84a3: sched: Check for idle
- Cc: <stable@kernel.org> # .32.x: 1b9508f: sched: Rate-limit newidle
- Cc: <stable@kernel.org> # .32.x: fd21073: sched: Fix affinity logic
- Cc: <stable@kernel.org> # .32.x
+ Cc: <stable@vger.kernel.org> # .32.x: a1f84a3: sched: Check for idle
+ Cc: <stable@vger.kernel.org> # .32.x: 1b9508f: sched: Rate-limit newidle
+ Cc: <stable@vger.kernel.org> # .32.x: fd21073: sched: Fix affinity logic
+ Cc: <stable@vger.kernel.org> # .32.x
Signed-off-by: Ingo Molnar <mingo@elte.hu>
The tag sequence has the meaning of: