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Commit 1ff44895 authored by Satya Durga Srinivasu Prabhala's avatar Satya Durga Srinivasu Prabhala
Browse files

sched: Introduce PANIC_ON_SCHED_BUG 



Introduce PANIC_ON_SCHED_BUG to catch issues related to scheduler
like calling sleepable functions inside atomic context etc.

Change-Id: I9f1fe96772b317b17bd0e7423a48023d3cf141c7
Signed-off-by: default avatarSatya Durga Srinivasu Prabhala <satyap@codeaurora.org>
parent b2170bd2

kernel/sched/core.c

+6 −0
Original line number Diff line number Diff line
@@ -3407,6 +3407,9 @@ static noinline void __schedule_bug(struct task_struct *prev) 
	if (panic_on_warn)

		panic("scheduling while atomic\n");



#ifdef CONFIG_PANIC_ON_SCHED_BUG

	BUG();

#endif

	dump_stack();

	add_taint(TAINT_WARN, LOCKDEP_STILL_OK);

}
@@ -6595,6 +6598,9 @@ void ___might_sleep(const char *file, int line, int preempt_offset) 
		print_ip_sym(preempt_disable_ip);

		pr_cont("\n");

	}

#ifdef CONFIG_PANIC_ON_SCHED_BUG

	BUG();

#endif

	dump_stack();

	add_taint(TAINT_WARN, LOCKDEP_STILL_OK);

}

lib/Kconfig.debug

+10 −0
Original line number Diff line number Diff line
@@ -1000,6 +1000,16 @@ config SCHED_INFO 
	bool

	default n



config PANIC_ON_SCHED_BUG

	bool "Panic on all bugs encountered by the scheduler"

	help

	  Say Y here to panic on all 'BUG:' conditions encountered by the

	  scheduler, even potentially-recoverable ones such as scheduling

	  while atomic, sleeping from invalid context, and detection of

	  broken arch topologies.



	  Say N if unsure.



config SCHEDSTATS

	bool "Collect scheduler statistics"

	depends on DEBUG_KERNEL && PROC_FS