On 20 August 2013 10:41, Li Zhong <zhong@xxxxxxxxxxxxxxxxxx> wrote:
> This patch tries to fix lockdep complaint attached below.
>
> It seems that we should always read acquire the cpufreq_rwsem, whether
> CONFIG_SMP is enabled or not. And CONFIG_HOTPLUG_CPU depends on
> CONFIG_SMP, so it seems we don't need CONFIG_SMP for the code enabled by
> CONFIG_HOTPLUG_CPU.
>
> [ 0.504191] =====================================
> [ 0.504627] [ BUG: bad unlock balance detected! ]
> [ 0.504627] 3.11.0-rc6-next-20130819 #1 Not tainted
> [ 0.504627] -------------------------------------
> [ 0.504627] swapper/1 is trying to release lock (cpufreq_rwsem) at:
> [ 0.504627] [<ffffffff813d927a>] cpufreq_add_dev+0x13a/0x3e0
> [ 0.504627] but there are no more locks to release!
> [ 0.504627]
> [ 0.504627] other info that might help us debug this:
> [ 0.504627] 1 lock held by swapper/1:
> [ 0.504627] #0: (subsys mutex#4){+.+.+.}, at: [<ffffffff8134a7bf>] subsys_interface_register+0x4f/0xe0
> [ 0.504627]
> [ 0.504627] stack backtrace:
> [ 0.504627] CPU: 0 PID: 1 Comm: swapper Not tainted 3.11.0-rc6-next-20130819 #1
> [ 0.504627] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007
> [ 0.504627] ffffffff813d927a ffff88007f847c98 ffffffff814c062b ffff88007f847cc8
> [ 0.504627] ffffffff81098bce ffff88007f847cf8 ffffffff81aadc30 ffffffff813d927a
> [ 0.504627] 00000000ffffffff ffff88007f847d68 ffffffff8109d0be 0000000000000006
> [ 0.504627] Call Trace:
> [ 0.504627] [<ffffffff813d927a>] ? cpufreq_add_dev+0x13a/0x3e0
> [ 0.504627] [<ffffffff814c062b>] dump_stack+0x19/0x1b
> [ 0.504627] [<ffffffff81098bce>] print_unlock_imbalance_bug+0xfe/0x110
> [ 0.504627] [<ffffffff813d927a>] ? cpufreq_add_dev+0x13a/0x3e0
> [ 0.504627] [<ffffffff8109d0be>] lock_release_non_nested+0x1ee/0x310
> [ 0.504627] [<ffffffff81099d0e>] ? mark_held_locks+0xae/0x120
> [ 0.504627] [<ffffffff811510cb>] ? kfree+0xcb/0x1d0
> [ 0.504627] [<ffffffff813d77ea>] ? cpufreq_policy_free+0x4a/0x60
> [ 0.504627] [<ffffffff813d927a>] ? cpufreq_add_dev+0x13a/0x3e0
> [ 0.504627] [<ffffffff8109d2a4>] lock_release+0xc4/0x250
> [ 0.504627] [<ffffffff8106c9f3>] up_read+0x23/0x40
> [ 0.504627] [<ffffffff813d927a>] cpufreq_add_dev+0x13a/0x3e0
> [ 0.504627] [<ffffffff8134a809>] subsys_interface_register+0x99/0xe0
> [ 0.504627] [<ffffffff81b19f3b>] ? cpufreq_gov_dbs_init+0x12/0x12
> [ 0.504627] [<ffffffff813d7f0d>] cpufreq_register_driver+0x9d/0x1d0
> [ 0.504627] [<ffffffff81b19f3b>] ? cpufreq_gov_dbs_init+0x12/0x12
> [ 0.504627] [<ffffffff81b1a039>] acpi_cpufreq_init+0xfe/0x1f8
> [ 0.504627] [<ffffffff810002ba>] do_one_initcall+0xda/0x180
> [ 0.504627] [<ffffffff81ae301e>] kernel_init_freeable+0x12c/0x1bb
> [ 0.504627] [<ffffffff81ae2841>] ? do_early_param+0x8c/0x8c
> [ 0.504627] [<ffffffff814b4dd0>] ? rest_init+0x140/0x140
> [ 0.504627] [<ffffffff814b4dde>] kernel_init+0xe/0xf0
> [ 0.504627] [<ffffffff814d029a>] ret_from_fork+0x7a/0xb0
> [ 0.504627] [<ffffffff814b4dd0>] ? rest_init+0x140/0x140
>
> Signed-off-by: Li Zhong <zhong@xxxxxxxxxxxxxxxxxx>
> ---
> drivers/cpufreq/cpufreq.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
Acked-and-Tested-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
--
To unsubscribe from this list: send the line "unsubscribe linux-next" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
