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author | Takashi Iwai <tiwai@suse.de> | 2012-04-07 12:28:00 +0200 |
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committer | Takashi Iwai <tiwai@suse.de> | 2012-04-07 12:28:00 +0200 |
commit | c38f62b08d800104fa9b0e9d6e9141459986c06d (patch) | |
tree | 1d04d768c8aa0c1a544d1f068317c7beb0101be2 /Documentation/RCU/checklist.txt | |
parent | ALSA: hda - clean up CX20549 test mixer setup (diff) | |
parent | ASoC: tegra: fix i2s compilation when !CONFIG_DEBUG_FS (diff) | |
download | linux-dev-c38f62b08d800104fa9b0e9d6e9141459986c06d.tar.xz linux-dev-c38f62b08d800104fa9b0e9d6e9141459986c06d.zip |
Merge tag 'asoc-3.4' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-linus
ASoC: fixes for 3.4
A bunch of driver-specific fixes and one generic fix for the new support
for platform DAPM contexts - we were picking the wrong default for the
idle_bias_off setting which was meaning we weren't actually achieving
any useful runtime PM on platform devices.
Diffstat (limited to 'Documentation/RCU/checklist.txt')
-rw-r--r-- | Documentation/RCU/checklist.txt | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/Documentation/RCU/checklist.txt b/Documentation/RCU/checklist.txt index bff2d8be1e18..5c8d74968090 100644 --- a/Documentation/RCU/checklist.txt +++ b/Documentation/RCU/checklist.txt @@ -180,6 +180,20 @@ over a rather long period of time, but improvements are always welcome! operations that would not normally be undertaken while a real-time workload is running. + In particular, if you find yourself invoking one of the expedited + primitives repeatedly in a loop, please do everyone a favor: + Restructure your code so that it batches the updates, allowing + a single non-expedited primitive to cover the entire batch. + This will very likely be faster than the loop containing the + expedited primitive, and will be much much easier on the rest + of the system, especially to real-time workloads running on + the rest of the system. + + In addition, it is illegal to call the expedited forms from + a CPU-hotplug notifier, or while holding a lock that is acquired + by a CPU-hotplug notifier. Failing to observe this restriction + will result in deadlock. + 7. If the updater uses call_rcu() or synchronize_rcu(), then the corresponding readers must use rcu_read_lock() and rcu_read_unlock(). If the updater uses call_rcu_bh() or |