On Wed, Sep 10, 2014 at 08:13:46PM +0100, Stephen Boyd wrote: > Rob Clark reports a sleeping while atomic bug when using perf. > > BUG: sleeping function called from invalid context at ../kernel/locking/mutex.c:583 > in_atomic(): 1, irqs_disabled(): 128, pid: 0, name: swapper/0 > ------------[ cut here ]------------ > WARNING: CPU: 2 PID: 4828 at ../kernel/locking/mutex.c:479 mutex_lock_nested+0x3a0/0x3e8() > DEBUG_LOCKS_WARN_ON(in_interrupt()) > Modules linked in: > CPU: 2 PID: 4828 Comm: Xorg.bin Tainted: G W 3.17.0-rc3-00234-gd535c45-dirty #819 > [<c0216690>] (unwind_backtrace) from [<c0212174>] (show_stack+0x10/0x14) > [<c0212174>] (show_stack) from [<c0867cc0>] (dump_stack+0x98/0xb8) > [<c0867cc0>] (dump_stack) from [<c02492a4>] (warn_slowpath_common+0x70/0x8c) > [<c02492a4>] (warn_slowpath_common) from [<c02492f0>] (warn_slowpath_fmt+0x30/0x40) > [<c02492f0>] (warn_slowpath_fmt) from [<c086a3f8>] (mutex_lock_nested+0x3a0/0x3e8) > [<c086a3f8>] (mutex_lock_nested) from [<c0294d08>] (irq_find_host+0x20/0x9c) > [<c0294d08>] (irq_find_host) from [<c0769d50>] (of_irq_get+0x28/0x48) > [<c0769d50>] (of_irq_get) from [<c057d104>] (platform_get_irq+0x1c/0x8c) > [<c057d104>] (platform_get_irq) from [<c021a06c>] (cpu_pmu_enable_percpu_irq+0x14/0x38) > [<c021a06c>] (cpu_pmu_enable_percpu_irq) from [<c02b1634>] (flush_smp_call_function_queue+0x88/0x178) > [<c02b1634>] (flush_smp_call_function_queue) from [<c0214dc0>] (handle_IPI+0x88/0x160) > [<c0214dc0>] (handle_IPI) from [<c0208930>] (gic_handle_irq+0x64/0x68) > [<c0208930>] (gic_handle_irq) from [<c0212d04>] (__irq_svc+0x44/0x5c) > Exception stack(0xe63ddea0 to 0xe63ddee8) > dea0: 00000001 00000001 00000000 c2f3b200 c16db380 c032d4a0 e63ddf40 60010013 > dec0: 00000000 001fbfd4 00000100 00000000 00000001 e63ddee8 c0284770 c02a2e30 > dee0: 20010013 ffffffff > [<c0212d04>] (__irq_svc) from [<c02a2e30>] (ktime_get_ts64+0x1c8/0x200) > [<c02a2e30>] (ktime_get_ts64) from [<c032d4a0>] (poll_select_set_timeout+0x60/0xa8) > [<c032d4a0>] (poll_select_set_timeout) from [<c032df64>] (SyS_select+0xa8/0x118) > [<c032df64>] (SyS_select) from [<c020e8e0>] (ret_fast_syscall+0x0/0x48) > ---[ end trace 0bb583b46342da6f ]--- > INFO: lockdep is turned off. > > We don't really need to get the platform irq again when we're > enabling or disabling the per-cpu irq. Furthermore, we don't > really need to set and clear bits in the active_irqs bitmask > because that's only used in the non-percpu irq case to figure out > when the last CPU PMU has been disabled. Just pass the irq > directly to the enable/disable functions to clean all this up. > This should be slightly more efficient and also fix the > scheduling while atomic bug. > > Reported-by: Rob Clark <robdclark@xxxxxxxxx> > Fixes: bbd64559376f "ARM: perf: support percpu irqs for the CPU PMU" > Acked-by: Will Deacon <will.deacon@xxxxxxx> > Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxxxxxx> > --- > > I'll drop this in the patch tracker tomorrow unless I hear differently. Cheers Stephen, don't forget to CC stable. Will -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
