linux-kernel - Re: [PATCH] powerpc/perf/24x7: Fix lockdep warning

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Date:	Tue, 07 Jul 2015 17:54:31 -0300
From:	Gustavo Luiz Duarte <gustavold@...ux.vnet.ibm.com>
To:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
CC:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [PATCH] powerpc/perf/24x7: Fix lockdep warning


On 07/07/2015 04:37 PM, Sukadev Bhattiprolu wrote:
>  From 370152d9427e57cd9632b00189f71099f8e85544 Mon Sep 17 00:00:00 2001
> From: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
> Date: Tue, 7 Jul 2015 12:21:10 -0400
> Subject: [PATCH 1/1] powerpc/perf/24x7: Fix lockdep warning
>
> The sysfs attributes for the 24x7 counters are dynamically allocated.
> Initialize the attributes using sysfs_attr_init() to fix following
> warning which occurs when CONFIG_DEBUG_LOCK_VMALLOC=y.
>
> [    0.346249] audit: initializing netlink subsys (disabled)
> [    0.346284] audit: type=2000 audit(1436295254.340:1): initialized
> [    0.346489] BUG: key c0000000efe90198 not in .data!
> [    0.346491] DEBUG_LOCKS_WARN_ON(1)
> [    0.346502] ------------[ cut here ]------------
> [    0.346504] WARNING: at ../kernel/locking/lockdep.c:3002
> [    0.346506] Modules linked in:
>
> Reported-by: Gustavo Luiz Duarte <gustavold@...ux.vnet.ibm.com>
> Signed-off-by: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>

Tested-by: Gustavo Luiz Duarte <gustavold@...ux.vnet.ibm.com>

I verified that it fixes a BUG splat on PowerVM (tested on little endian).

[]'s
Gustavo

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