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SubjectRe: [PATCH RFC tip/core/rcu 02/16] rcu: make dead code really dead
On Thu, Apr 15, 2010 at 11:13:25AM -0700, Paul E. McKenney wrote:
> From: Lai Jiangshan <laijs@cn.fujitsu.com>
>
> cleanup: make dead code really dead
>
> Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
> ---
> kernel/rcutree.c | 4 ++--
> 1 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/kernel/rcutree.c b/kernel/rcutree.c
> index e54c123..6042fb8 100644
> --- a/kernel/rcutree.c
> +++ b/kernel/rcutree.c
> @@ -1236,11 +1236,11 @@ static void force_quiescent_state(struct rcu_state *rsp, int relaxed)
> break; /* grace period idle or initializing, ignore. */
>
> case RCU_SAVE_DYNTICK:
> -
> - raw_spin_unlock(&rnp->lock); /* irqs remain disabled */
> if (RCU_SIGNAL_INIT != RCU_SAVE_DYNTICK)
> break; /* So gcc recognizes the dead code. */

GCC's new __builtin_unreachable would help here, though obviously we
can't count on 4.5 or newer quite yet. A wrapper in compiler.h would
let us use it when available though.

- Josh Triplett


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