4 Commits

Author	SHA1	Message	Date
Prasad Sodagudi	4fa2ab20f5	lib: spinlock: Trigger a watchdog bite on spin_dump for rwlock ... Currently dump_stack is printed once a spin_bug is detected for rwlock. So provide an options to trigger a panic or watchdog bite for debugging rwlock magic corruptions and lockups. Change-Id: I20807e8eceb8b81635e58701d1f9f9bd36ab5877 Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org> Signed-off-by: Venkata Narendra Kumar Gutta <vnkgutta@codeaurora.org>	2018-09-21 18:10:31 -07:00
Rohit Vaswani	e0965e6590	lib: spinlock: Cause a watchdog bite on spin_dump ... Currently we cause a BUG_ON once a spin_bug is detected, but that causes a whole lot of processing and the other CPUs would have proceeded to perform other actions and the state of the system is moved by the time we can analyze it. Provide an option to trigger a watchdog bite instead so that we can get the traces as close to the issue as possible. Change-Id:Ic8d692ebd02c6940a3b4e5798463744db20b0026 Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org> Signed-off-by: Rishabh Bhatnagar <rishabhb@codeaurora.org>	2018-08-13 11:48:30 -07:00
Waiman Long	bc88c10d7e	locking/spinlock/debug: Remove spinlock lockup detection code ... The current spinlock lockup detection code can sometimes produce false positives because of the unfairness of the locking algorithm itself. So the lockup detection code is now removed. Instead, we are relying on the NMI watchdog to detect potential lockup. We won't have lockup detection if the watchdog isn't running. The commented-out read-write lock lockup detection code are also removed. Signed-off-by: Waiman Long <longman@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sasha Levin <sasha.levin@oracle.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1486583208-11038-1-git-send-email-longman@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2017-02-10 09:09:49 +01:00
Peter Zijlstra	60fc28746a	locking: Move the spinlock code to kernel/locking/ ... Suggested-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/n/tip-b81ol0z3mon45m51o131yc9j@git.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>	2013-11-06 07:55:21 +01:00