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

From: Gustavo Luiz Duarte
Date: Tue Jul 07 2015 - 16:54:48 EST



On 07/07/2015 04:37 PM, Sukadev Bhattiprolu wrote:
From 370152d9427e57cd9632b00189f71099f8e85544 Mon Sep 17 00:00:00 2001
From: Sukadev Bhattiprolu <sukadev@xxxxxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Sukadev Bhattiprolu <sukadev@xxxxxxxxxxxxxxxxxx>

Tested-by: Gustavo Luiz Duarte <gustavold@xxxxxxxxxxxxxxxxxx>

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

[]'s
Gustavo

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