From mboxrd@z Thu Jan 1 00:00:00 1970 From: tony@atomide.com (Tony Lindgren) Date: Tue, 26 Apr 2016 12:39:50 -0700 Subject: [PATCH arm 1/1] arm: Use _rcuidle tracepoint to allow use from idle In-Reply-To: <20160426190755.GK3715@linux.vnet.ibm.com> References: <1461617335-22372-1-git-send-email-paulmck@linux.vnet.ibm.com> <20160426150031.GP5995@atomide.com> <20160426175214.GJ3715@linux.vnet.ibm.com> <20160426182939.GO5995@atomide.com> <20160426190755.GK3715@linux.vnet.ibm.com> Message-ID: <20160426193949.GP5995@atomide.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org * Paul E. McKenney [160426 12:08]: > On Tue, Apr 26, 2016 at 11:29:39AM -0700, Tony Lindgren wrote: > > * Paul E. McKenney [160426 10:53]: > > > Does the following patch help? > > > > It just changes the output.. See below. > > Ah -- you need both patches. Oops sorry, I though I had the first one already from next.. > These are on -rcu at: > > 501889db6fee (arm: Use _rcuidle tracepoint to allow use from idle) > 99cd56ad86d2 (rm: Use more _rcuidle tracepoints to allow use from idle) With these omap4 is now OK. But omap3 produces yet another warning, See below :) Regards, Tony 8< ------------------ =============================== [ INFO: suspicious RCU usage. ] 4.6.0-rc5-next-20160426+ #1114 Not tainted ------------------------------- include/trace/events/clk.h:59 suspicious rcu_dereference_check() usage! other info that might help us debug this: RCU used illegally from idle CPU! rcu_scheduler_active = 1, debug_locks = 0 RCU used illegally from extended quiescent state! 2 locks held by swapper/0/0: #0: (&oh->hwmod_key#30){......}, at: [] omap_hwmod_idle+0x18/0x44 #1: (enable_lock){......}, at: [] clk_enable_lock+0x18/0x124 stack backtrace: CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.6.0-rc5-next-20160426+ #1114 Hardware name: Generic OMAP36xx (Flattened Device Tree) [] (unwind_backtrace) from [] (show_stack+0x10/0x14) [] (show_stack) from [] (dump_stack+0xb0/0xe4) [] (dump_stack) from [] (clk_core_disable+0x17c/0x348) [] (clk_core_disable) from [] (clk_disable+0x24/0x30) [] (clk_disable) from [] (_disable_clocks+0x18/0x7c) [] (_disable_clocks) from [] (_idle+0x12c/0x230) [] (_idle) from [] (omap_hwmod_idle+0x24/0x44) [] (omap_hwmod_idle) from [] (omap_device_idle+0x3c/0x90) [] (omap_device_idle) from [] (__rpm_callback+0x2c/0x60) [] (__rpm_callback) from [] (rpm_callback+0x20/0x80) [] (rpm_callback) from [] (rpm_suspend+0x100/0x768) [] (rpm_suspend) from [] (__pm_runtime_suspend+0x64/0x84) [] (__pm_runtime_suspend) from [] (omap2_gpio_prepare_for_idle+0x5 c/0x70) [] (omap2_gpio_prepare_for_idle) from [] (omap_sram_idle+0x140/0x2 44) [] (omap_sram_idle) from [] (omap3_enter_idle_bm+0xfc/0x1ec) [] (omap3_enter_idle_bm) from [] (cpuidle_enter_state+0x80/0x3d4) [] (cpuidle_enter_state) from [] (cpu_startup_entry+0x198/0x3a0) [] (cpu_startup_entry) from [] (start_kernel+0x354/0x3c8) [] (start_kernel) from [<8000807c>] (0x8000807c)