Re: [PATCH RFC idle] Make arm, sh, and x86 stop using RCU when idle

From: Josh Triplett
Date: Wed Feb 01 2012 - 19:48:48 EST

On Wed, Feb 01, 2012 at 04:42:53PM -0800, Paul E. McKenney wrote:
> RCU's shiny new diagnostics (thank you, Frederic!) for using RCU when idle
> located a few problems in arm, sh, and x86. This patch series contains
> alleged fixes for these problems. And they are real problems -- if RCU
> believes that the CPU is idle, it is ignoring it. Which means that the
> idle CPU can say "rcu_read_lock()" all it like, but there will be no
> useful effect.

Having to put these calls down in every idle driver seems like such an
ugly layering violation. Not that I have a better alternative to

- Josh Triplett
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at