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doc: De-emphasize smp_read_barrier_depends

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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. ]
This commit is contained in:
Paul E. McKenney
2017-11-27 09:20:40 -08:00
parent 98c1ec7cef
commit 9ad3c143d7
5 changed files with 10 additions and 12 deletions
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Documentation/RCU/Design/Requirements/Requirements.html
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@@ -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.