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cb42e2d916
Below warning is observed during boot when lockdep is enabled due to per-cpu irqsoff_store access. As rcu_read_lock/unlock can not be called from idle CPU, fix the warning by disabling lockdep checks before call and enable it after. [ 0.125185] ============================= [ 0.129317] WARNING: suspicious RCU usage [ 0.133452] 4.19.12+ #31 Not tainted [ 0.137130] ----------------------------- [ 0.141263] include/trace/events/preemptirq.h:91 \ suspicious rcu_dereference_check() usage! [ 0.153137] [ 0.153137] other info that might help us debug this: [ 0.153137] [ 0.161364] [ 0.161364] RCU used illegally from idle CPU! [ 0.161364] rcu_scheduler_active = 1, debug_locks = 1 [ 0.172518] RCU used illegally from extended quiescent state! [ 0.178428] no locks held by swapper/0/0. [ 0.182560] [ 0.196994] Call trace: [ 0.199534] dump_backtrace+0x0/0x190 [ 0.203311] show_stack+0x20/0x30 [ 0.206728] dump_stack+0xe8/0x13c [ 0.210240] lockdep_rcu_suspicious+0x128/0x150 [ 0.214905] tracer_hardirqs_on+0x1a0/0x458 [ 0.219209] trace_hardirqs_on+0x148/0x1b8 [ 0.223428] arch_cpu_idle+0xf8/0x200 [ 0.227208] do_idle+0xcc/0x2a8 [ 0.230446] cpu_startup_entry+0x24/0x28 [ 0.234485] rest_init+0x1f0/0x200 [ 0.237998] start_kernel+0x434/0x4bc. Change-Id: I4ae8f57ba965d9263d90030ee938c39479d409ea Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>