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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2017-11-27 18:20:40 +0100 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2017-12-05 20:57:53 +0100 |
| commit | 9ad3c143d7d6942c66f27bc6c18f5df638f70aff (patch) | |
| tree | b0b52f72cd5d03677b2d643feaaa7220aa109f29 /Documentation/RCU/Design | |
| parent | drivers/dma/ioat: Remove now-redundant smp_read_barrier_depends() (diff) | |
| download | linux-9ad3c143d7d6942c66f27bc6c18f5df638f70aff.tar.xz linux-9ad3c143d7d6942c66f27bc6c18f5df638f70aff.zip | |
doc: De-emphasize smp_read_barrier_depends
This commit keeps only the historical and low-level discussion of
smp_read_barrier_depends().
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
[ paulmck: Adjusted to allow for David Howells feedback on prior commit. ]
Diffstat (limited to 'Documentation/RCU/Design')
| -rw-r--r-- | Documentation/RCU/Design/Requirements/Requirements.html | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/Documentation/RCU/Design/Requirements/Requirements.html b/Documentation/RCU/Design/Requirements/Requirements.html index 62e847bcdcdd..571c3d75510f 100644 --- a/Documentation/RCU/Design/Requirements/Requirements.html +++ b/Documentation/RCU/Design/Requirements/Requirements.html @@ -581,7 +581,8 @@ This guarantee was only partially premeditated. DYNIX/ptx used an explicit memory barrier for publication, but had nothing resembling <tt>rcu_dereference()</tt> for subscription, nor did it have anything resembling the <tt>smp_read_barrier_depends()</tt> -that was later subsumed into <tt>rcu_dereference()</tt>. +that was later subsumed into <tt>rcu_dereference()</tt> and later +still into <tt>READ_ONCE()</tt>. The need for these operations made itself known quite suddenly at a late-1990s meeting with the DEC Alpha architects, back in the days when DEC was still a free-standing company. |