linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <CA+55aFzQ0QZxL-PRnv4Db=wo1pDmBR45P-vpGxyeJnt1DFnSfA@mail.gmail.com>
Date:	Sun, 30 Nov 2014 16:21:19 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Dâniel Fraga <fragabr@...il.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: frequent lockups in 3.18rc4

On Sun, Nov 30, 2014 at 1:21 PM, Dâniel Fraga <fragabr@...il.com> wrote:
>
>         Yes, but "menuconfig" doesn't allow me to disable it (it's
> always checked). Newbie question: does TREE_PREEMPT_RCU depends on any
> other option? Thanks.

Maybe you'll have to turn off RCU_CPU_STALL_VERBOSE first.

Although I think you should be able to just edit the .config file,
delete the like that says

    CONFIG_TREE_PREEMPT_RCU=y

and then just do a "make oldconfig", and then verify that
TREE_PREEMPT_RCU hasn't been re-enabled by some dependency. But it
shouldn't have, and that "make oldconfig" should get rid of anything
that depends on TREE_PREEMPT_RCU.

                  Linus
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