On Thu, Feb 13, 2014 at 10:31 PM, Tarek Dakhran <t.dakh...@gmail.com> wrote: > Hi Tomasz, > > On Thursday, February 13, 2014, Tomasz Figa <t.f...@samsung.com> wrote: >> >> Hi Tarek, >> >> On 13.02.2014 04:08, Tarek Dakhran wrote: >>> >>> exynos4_local_timer_setup called on the secondary cpu before >>> irqs are enabled. request_irq can sleep, which produces next warning: >>> >>> on boot: >>> [ 0.370000] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000 >>> [ 0.370000] Setting up static identity map for 0x403b5700 - 0x403b5758 >>> [ 0.395000] CPU1: Booted secondary processor >>> [ 0.395000] ------------[ cut here ]------------ >>> [ 0.395000] WARNING: CPU: 1 PID: 0 at kernel/locking/lockdep.c:2742 >>> lockdep_trace_alloc+0xe0/0xfc() >>> [ 0.395000] DEBUG_LOCKS_WARN_ON(irqs_disabled_flags(flags)) >>> [ 0.395000] Modules linked in: >>> [ 0.395000] CPU: 1 PID: 0 Comm: swapper/1 Not tainted >>> 3.14.0-rc2-00004-g0db95f4 #128 >>> [ 0.395000] [<c0014308>] (unwind_backtrace) from [<c0011690>] >>> (show_stack+0x10/0x14) >>> [ 0.395000] [<c0011690>] (show_stack) from [<c03ae7d0>] >>> (dump_stack+0x6c/0xb8) >>> [ 0.395000] [<c03ae7d0>] (dump_stack) from [<c001d504>] >>> (warn_slowpath_common+0x68/0x8c) >>> [ 0.395000] [<c001d504>] (warn_slowpath_common) from [<c001d5bc>] >>> (warn_slowpath_fmt+0x30/0x40) >>> [ 0.395000] [<c001d5bc>] (warn_slowpath_fmt) from [<c0059824>] >>> (lockdep_trace_alloc+0xe0/0xfc) >>> [ 0.395000] [<c0059824>] (lockdep_trace_alloc) from [<c00bee24>] >>> (kmem_cache_alloc+0x24/0x160) >>> [ 0.395000] [<c00bee24>] (kmem_cache_alloc) from [<c0068174>] >>> (request_threaded_irq+0x64/0x130) >>> [ 0.395000] [<c0068174>] (request_threaded_irq) from [<c02efaf8>] >>> (exynos4_local_timer_setup+0xd0/0x124) >>> [ 0.395000] [<c02efaf8>] (exynos4_local_timer_setup) from [<c02efc34>] >>> (exynos4_mct_cpu_notify+0x78/0xf0) >>> [ 0.395000] [<c02efc34>] (exynos4_mct_cpu_notify) from [<c003d318>] >>> (notifier_call_chain+0x44/0x84) >>> [ 0.395000] [<c003d318>] (notifier_call_chain) from [<c001d61c>] >>> (__cpu_notify+0x24/0x40) >>> [ 0.395000] [<c001d61c>] (__cpu_notify) from [<c0013314>] >>> (secondary_start_kernel+0xe4/0x134) >>> [ 0.395000] [<c0013314>] (secondary_start_kernel) from [<40008624>] >>> (0x40008624) >>> [ 0.395000] ---[ end trace 347890460e745f50 ]--- >>> [ 0.420000] CPU1: update cpu_power 1024 >>> [ 0.420000] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001 >>> >>> on hotplug: >>> [ 108.040000] CPU3: Booted secondary processor >>> [ 108.040000] BUG: sleeping function called from invalid context at >>> mm/slub.c:965 >>> [ 108.040000] in_atomic(): 1, irqs_disabled(): 128, pid: 0, name: >>> swapper/3 >>> [ 108.040000] INFO: lockdep is turned off. >>> [ 108.040000] irq event stamp: 0 >>> [ 108.040000] hardirqs last enabled at (0): [< (null)>] (null) >>> [ 108.040000] hardirqs last disabled at (0): [<c001b768>] >>> copy_process.part.2+0x2a4/0x12f4 >>> [ 108.040000] softirqs last enabled at (0): [<c001b768>] >>> copy_process.part.2+0x2a4/0x12f4 >>> [ 108.040000] softirqs last disabled at (0): [< (null)>] (null) >>> [ 108.040000] CPU: 3 PID: 0 Comm: swapper/3 Tainted: G W >>> 3.14.0-rc2-00004-g0db95f4 #128 >>> [ 108.040000] [<c0014308>] (unwind_backtrace) from [<c0011690>] >>> (show_stack+0x10/0x14) >>> [ 108.040000] [<c0011690>] (show_stack) from [<c03ae7d0>] >>> (dump_stack+0x6c/0xb8) >>> [ 108.040000] [<c03ae7d0>] (dump_stack) from [<c00beed4>] >>> (kmem_cache_alloc+0xd4/0x160) >>> [ 108.040000] [<c00beed4>] (kmem_cache_alloc) from [<c0068174>] >>> (request_threaded_irq+0x64/0x130) >>> [ 108.040000] [<c0068174>] (request_threaded_irq) from [<c02efaf8>] >>> (exynos4_local_timer_setup+0xd0/0x124) >>> [ 108.040000] [<c02efaf8>] (exynos4_local_timer_setup) from [<c02efc34>] >>> (exynos4_mct_cpu_notify+0x78/0xf0) >>> [ 108.040000] [<c02efc34>] (exynos4_mct_cpu_notify) from [<c003d318>] >>> (notifier_call_chain+0x44/0x84) >>> [ 108.040000] [<c003d318>] (notifier_call_chain) from [<c001d61c>] >>> (__cpu_notify+0x24/0x40) >>> [ 108.040000] [<c001d61c>] (__cpu_notify) from [<c0013314>] >>> (secondary_start_kernel+0xe4/0x134) >>> [ 108.040000] [<c0013314>] (secondary_start_kernel) from [<40008624>] >>> (0x40008624) >>> >>> First patch fixes this problem by removing request_irq from >>> exynos4_local_timer_setup >>> Second removes non-dt stuff. >>> >>> Tested on linux kernel v3.14-rc2. >> >> >> It would be nice to say on which boards it has been tested. Let me check >> this on our boards anyway. >> >> Best regards, >> Tomasz > > > Tested on smdk5410 reference board with lockdep enabled. > I think the problem will present on all boards due to call sleeping function > in irq_disabled context. > > Best Regards, > Tarek > Has anyone else tested this patches? if yes, what is the result?
Best regards, . Tarek -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
