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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <200807131505.25990.jozwicki@aster.pl>
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]  =======================

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/