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types: Update obsolete callback_head comment

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The comment header for callback_head (and thus for rcu_head) states that
the bottom two bits of a pointer to these structures must be zero.  This
is obsolete:  The new requirement is that only the bottom bit need be
zero.  This commit therefore updates this comment.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2017-02-02 11:40:15 -08:00
parent a5dd63efda
commit 468d01bec5
1 changed files with 1 additions and 1 deletions
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include/linux/types.h
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@ -209,7 +209,7 @@ struct ustat {
* naturally due ABI requirements, but some architectures (like CRIS) have * naturally due ABI requirements, but some architectures (like CRIS) have
* weird ABI and we need to ask it explicitly. * weird ABI and we need to ask it explicitly.
* *
* The alignment is required to guarantee that bits 0 and 1 of @next will be * The alignment is required to guarantee that bit 0 of @next will be
* clear under normal conditions -- as long as we use call_rcu(), * clear under normal conditions -- as long as we use call_rcu(),
* call_rcu_bh(), call_rcu_sched(), or call_srcu() to queue callback. * call_rcu_bh(), call_rcu_sched(), or call_srcu() to queue callback.
* *