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| author | Ingo Molnar <mingo@kernel.org> | 2013-02-04 22:06:34 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-02-04 22:06:34 +0400 |
| commit | 9228b5f24325a3863a4819300b471278ff14b48f (patch) | |
| tree | 7108d5a0e1d0a717d80a7f77e45d29255321b2e6 /Documentation | |
| parent | 88b62b915b0b7e25870eb0604ed9a92ba4bfc9f7 (diff) | |
| parent | 40393f525fe698e2b639cf1851ef0a40e7e158a8 (diff) | |
| download | linux-9228b5f24325a3863a4819300b471278ff14b48f.tar.xz | |
Merge branch 'rcu/next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu
Pull RCU updates from Paul E. McKenney:
1. Changes to rcutorture and to RCU documentation. Posted to LKML at
https://lkml.org/lkml/2013/1/26/188.
2. Enhancements to uniprocessor handling in tiny RCU. Posted to LKML
at https://lkml.org/lkml/2013/1/27/2.
3. Tag RCU callbacks with grace-period number to simplify callback
advancement. Posted to LKML at https://lkml.org/lkml/2013/1/26/203.
4. Miscellaneous fixes. Posted to LKML at https://lkml.org/lkml/2013/1/26/204.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/atomic_ops.txt | 2 | ||||
| -rw-r--r-- | Documentation/kernel-parameters.txt | 2 | ||||
| -rw-r--r-- | Documentation/memory-barriers.txt | 1 |
3 files changed, 4 insertions, 1 deletions
diff --git a/Documentation/atomic_ops.txt b/Documentation/atomic_ops.txt index 27f2b21a9d5c..d9ca5be9b471 100644 --- a/Documentation/atomic_ops.txt +++ b/Documentation/atomic_ops.txt @@ -253,6 +253,8 @@ This performs an atomic exchange operation on the atomic variable v, setting the given new value. It returns the old value that the atomic variable v had just before the operation. +atomic_xchg requires explicit memory barriers around the operation. + int atomic_cmpxchg(atomic_t *v, int old, int new); This performs an atomic compare exchange operation on the atomic value v, diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 363e348bff9b..6c723811c0a0 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -2438,7 +2438,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted. real-time workloads. It can also improve energy efficiency for asymmetric multiprocessors. - rcu_nocbs_poll [KNL,BOOT] + rcu_nocb_poll [KNL,BOOT] Rather than requiring that offloaded CPUs (specified by rcu_nocbs= above) explicitly awaken the corresponding "rcuoN" kthreads, diff --git a/Documentation/memory-barriers.txt b/Documentation/memory-barriers.txt index 3c4e1b3b80a1..fa5d8a9ae205 100644 --- a/Documentation/memory-barriers.txt +++ b/Documentation/memory-barriers.txt @@ -1685,6 +1685,7 @@ explicit lock operations, described later). These include: xchg(); cmpxchg(); + atomic_xchg(); atomic_cmpxchg(); atomic_inc_return(); atomic_dec_return(); |