Commit 8dce7a9a authored Jun 13, 2013 by Sasha Levin Committed by Ingo Molnar Nov 27, 2013

lockdep: Be nice about building from userspace



Lockdep is an awesome piece of code which detects locking issues
which are relevant both to userspace and kernelspace. We can
easily make lockdep work in userspace since there is really no
kernel spacific magic going on in the code.

All we need is to wrap two functions which are used by lockdep
and are very kernel specific.

Doing that will allow tools located in tools/ to easily utilize
lockdep's code for their own use.

Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: penberg@kernel.org
Cc: torvalds@linux-foundation.org
Link: http://lkml.kernel.org/r/1352753446-24109-1-git-send-email-sasha.levin@oracle.com


Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent 5c4853b6

kernel/locking/lockdep.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -590,6 +590,7 @@ static int very_verbose(struct lock_class *class)
		/*
		* Is this the address of a static object:
		*/
		#ifdef __KERNEL__
		static int static_obj(void *obj)
		{
		unsigned long start = (unsigned long) &_stext,
		@@ -616,6 +617,7 @@ static int static_obj(void *obj)
		*/
		return is_module_address(addr) \|\| is_module_percpu_address(addr);
		}
		#endif

		/*
		* To make lock name printouts unique, we calculate a unique
		@@ -4115,6 +4117,7 @@ void debug_check_no_locks_held(void)
		}
		EXPORT_SYMBOL_GPL(debug_check_no_locks_held);

		#ifdef __KERNEL__
		void debug_show_all_locks(void)
		{
		struct task_struct g, p;
		@@ -4172,6 +4175,7 @@ retry:
		read_unlock(&tasklist_lock);
		}
		EXPORT_SYMBOL_GPL(debug_show_all_locks);
		#endif

		/*
		* Careful: only use this function if you are sure that

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