linux-kernel - Re: [PATCH 2.6.25.10] pm_qos_params: change spinlock to rwlock

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Date:	Sun, 13 Jul 2008 15:05:25 +0200
From:	"Jakub W. Jozwicki" <jozwicki@...er.pl>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, mgross@...ux.intel.com,
	mingo@...e.hu, tglx@...esys.com
Subject: Re: [PATCH 2.6.25.10] pm_qos_params: change spinlock to rwlock

Sunday, 13 of July 2008 10:28:16 Andrew Morton napisał(a):
> On Sun, 13 Jul 2008 01:19:19 +0200 "Jakub W. Jozwicki" <jozwicki@...er.pl> 
wrote:
> > Concurrent calls to pm_qos_requirement shouldn't block each other. This
> > patch changes spinlock to rwlock and fixes issues with PREEMPT_RT.
>
> "fixes issues" is nowhere near an adequate description.
>
> Please provide complete descriptions for kernel patches.  That includes
> describing the mysterious "issue" in full!
>
> Thanks.

[  114.647010] BUG: sleeping function called from invalid context swapper(0) 
at kernel/rtmutex.c:742
[  114.647010] in_atomic():1 [00000001], irqs_disabled():0
[  114.647010] Pid: 0, comm: swapper Not tainted 2.6.25.10-rtXXX #10
[  114.647010]  [<c0120fc4>] __might_sleep+0xf1/0xf8
[  114.647010]  [<c045499c>] __rt_spin_lock+0x24/0x61
[  114.647010]  [<c04549e1>] rt_spin_lock+0x8/0xa
[  114.647010]  [<c013ec8d>] pm_qos_requirement+0x10/0x29
[  114.647010]  [<c038ef36>] menu_select+0x5d/0x7f
[  114.647010]  [<c038e4d8>] cpuidle_idle_call+0x47/0x9b
[  114.647010]  [<c038e491>] ? cpuidle_idle_call+0x0/0x9b
[  114.647010]  [<c01060ff>] cpu_idle+0xaf/0x106
[  114.647010]  [<c0441c87>] rest_init+0x67/0x69
[  114.647010]  =======================
[  115.649517] BUG: sleeping function called from invalid context swapper(0) 
at kernel/rtmutex.c:742
[  115.649517] in_atomic():1 [00000001], irqs_disabled():0
[  115.649517] Pid: 0, comm: swapper Not tainted 2.6.25.10-rtXXX #10
[  115.649517]  [<c0120fc4>] __might_sleep+0xf1/0xf8
[  115.649517]  [<c045499c>] __rt_spin_lock+0x24/0x61
[  115.649517]  [<c04549e1>] rt_spin_lock+0x8/0xa
[  115.649517]  [<c013ec8d>] pm_qos_requirement+0x10/0x29
[  115.649517]  [<c038ef36>] menu_select+0x5d/0x7f
[  115.649517]  [<c038e4d8>] cpuidle_idle_call+0x47/0x9b
[  115.649517]  [<c038e491>] ? cpuidle_idle_call+0x0/0x9b
[  115.649517]  [<c01060ff>] cpu_idle+0xaf/0x106
[  115.649517]  [<c0441c87>] rest_init+0x67/0x69
[  115.649517]  =======================
[  116.650040] BUG: sleeping function called from invalid context swapper(0) 
at kernel/rtmutex.c:742
[  116.650040] in_atomic():1 [00000001], irqs_disabled():0
[  116.650040] Pid: 0, comm: swapper Not tainted 2.6.25.10-rtXXX #10
[  116.650040]  [<c0120fc4>] __might_sleep+0xf1/0xf8
[  116.650040]  [<c045499c>] __rt_spin_lock+0x24/0x61
[  116.650040]  [<c04549e1>] rt_spin_lock+0x8/0xa
[  116.650040]  [<c013ec8d>] pm_qos_requirement+0x10/0x29
[  116.650040]  [<c038ef36>] menu_select+0x5d/0x7f
[  116.650040]  [<c038e4d8>] cpuidle_idle_call+0x47/0x9b
[  116.650040]  [<c038e491>] ? cpuidle_idle_call+0x0/0x9b
[  116.650040]  [<c01060ff>] cpu_idle+0xaf/0x106
[  116.650040]  [<c0441c87>] rest_init+0x67/0x69
[  116.650040]  =======================

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