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| author |   Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2009-08-21 22:08:51 -0700 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2009-08-22 13:07:09 +0200 |
| commit | b560d8ad8583803978aaaeba50ef29dc8e97a610 (patch) | |
| tree | 2700931e04f0b446a7603e74706d6dd9c782eb84 /include/linux/hardirq.h | |
| parent | rcu: Delay rcu_barrier() wait until beginning of next CPU-hotunplug operation. (diff) | |
| download | linux-dev-b560d8ad8583803978aaaeba50ef29dc8e97a610.tar.xz linux-dev-b560d8ad8583803978aaaeba50ef29dc8e97a610.zip | |
rcu: Expunge lingering references to CONFIG_CLASSIC_RCU, optimize on !SMP
A couple of references to CONFIG_CLASSIC_RCU have survived.
Although these are harmless, it is past time for them to go.
The one in hardirq.h is strictly a readability problem.
The two in pagemap.h appear to disable a !SMP performance
optimization (which this patch re-enables).
This does raise the issue as to whether pagemap.h should really
be referring to the CPU implementation. Long term, I intend to
make the RCU implementation driven by CONFIG_PREEMPT, at which
point these should change from defined(CONFIG_TREE_RCU) to
!defined(CONFIG_PREEMPT). In the meantime, is there something
else that could be done in pagemap.h?
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: akpm@linux-foundation.org
Cc: mathieu.desnoyers@polymtl.ca
Cc: josht@linux.vnet.ibm.com
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
LKML-Reference: <20090822050851.GA8414@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/hardirq.h')
| -rw-r--r-- | include/linux/hardirq.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/hardirq.h b/include/linux/hardirq.h index 8246c697863d..330cb31bb496 100644 --- a/include/linux/hardirq.h +++ b/include/linux/hardirq.h @@ -132,7 +132,7 @@ static inline void account_system_vtime(struct task_struct *tsk) } #endif -#if defined(CONFIG_NO_HZ) && !defined(CONFIG_CLASSIC_RCU) +#if defined(CONFIG_NO_HZ) extern void rcu_irq_enter(void); extern void rcu_irq_exit(void); extern void rcu_nmi_enter(void); @@ -142,7 +142,7 @@ extern void rcu_nmi_exit(void); # define rcu_irq_exit() do { } while (0) # define rcu_nmi_enter() do { } while (0) # define rcu_nmi_exit() do { } while (0) -#endif /* #if defined(CONFIG_NO_HZ) && !defined(CONFIG_CLASSIC_RCU) */ +#endif /* #if defined(CONFIG_NO_HZ) */ /* * It is safe to do non-atomic ops on ->hardirq_context, |