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| author |   Russell King <rmk+kernel@arm.linux.org.uk> | 2015-07-07 12:35:33 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2015-07-07 12:35:33 +0100 |
| commit | 06be5eefe1192eb8ce8d07497f67595b6bfe9741 (patch) | |
| tree | 80f1987d4970f8079681f8be0c135cafc8d6329a /Documentation/RCU/whatisRCU.txt | |
| parent | ARM: fix lockdep unannotated irqs-off warning (diff) | |
| parent | ARM: avoid unwanted GCC memset()/memcpy() optimisations for IO variants (diff) | |
| download | linux-dev-06be5eefe1192eb8ce8d07497f67595b6bfe9741.tar.xz linux-dev-06be5eefe1192eb8ce8d07497f67595b6bfe9741.zip | |
Merge branches 'fixes' and 'ioremap' into for-linus
Diffstat (limited to 'Documentation/RCU/whatisRCU.txt')
| -rw-r--r-- | Documentation/RCU/whatisRCU.txt | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/Documentation/RCU/whatisRCU.txt b/Documentation/RCU/whatisRCU.txt index 88dfce182f66..5746b0c77f3e 100644 --- a/Documentation/RCU/whatisRCU.txt +++ b/Documentation/RCU/whatisRCU.txt @@ -256,7 +256,9 @@ rcu_dereference() If you are going to be fetching multiple fields from the RCU-protected structure, using the local variable is of course preferred. Repeated rcu_dereference() calls look - ugly and incur unnecessary overhead on Alpha CPUs. + ugly, do not guarantee that the same pointer will be returned + if an update happened while in the critical section, and incur + unnecessary overhead on Alpha CPUs. Note that the value returned by rcu_dereference() is valid only within the enclosing RCU read-side critical section. @@ -879,9 +881,7 @@ SRCU: Initialization/cleanup All: lockdep-checked RCU-protected pointer access - rcu_access_index rcu_access_pointer - rcu_dereference_index_check rcu_dereference_raw rcu_lockdep_assert rcu_sleep_check |