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Message-ID: <20141201230813.GE25340@linux.vnet.ibm.com> Date: Mon, 1 Dec 2014 15:08:13 -0800 From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> To: Dâniel Fraga <fragabr@...il.com> Cc: Linus Torvalds <torvalds@...ux-foundation.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: frequent lockups in 3.18rc4 On Mon, Dec 01, 2014 at 06:28:31PM -0200, Dâniel Fraga wrote: > On Mon, 1 Dec 2014 11:14:31 -0800 > "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> wrote: > > > If it would help to have !CONFIG_TREE_PREEMPT_RCU with CONFIG_PREEMPT=y, > > please let me know and I will create a patch that forces this. > > (Not mainline material, but if it helps with debug...) > > Hi Paul. Please, I'd like the patch, because without > preemption, I'm unable to trigger this bug. Well, this turned out to be way simpler than I expected. Passes light rcutorture testing. Sometimes you get lucky... Thanx, Paul diff --git a/init/Kconfig b/init/Kconfig index 903505e66d1d..2cf71fcd514f 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -469,7 +469,7 @@ choice config TREE_RCU bool "Tree-based hierarchical RCU" - depends on !PREEMPT && SMP + depends on SMP select IRQ_WORK help This option selects the RCU implementation that is -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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