tree f8027c5d44725404619bf64ea1523f09f4948034
parent f39c565a4d8ed46228ce9e7a0003a87b31f1749e
author Boqun Feng <boqun.feng@gmail.com> 1503902820 +0800
committer Boqun Feng <boqun.feng@gmail.com> 1504682357 +0800

lockdep/selftest: Add more recursive read related test cases

Add those four test cases:

1.
	CPU1		CPU2		CPU3
	=============	=============	=============
	write_lock(X);
			write_lock(Y);
					write_lock(Z);
	read_lock(Y);
			read_lock(Z);
					read_lock(X);

	deadlock.

2.
	CPU1		CPU2		CPU3
	=============	=============	=============
	write_lock(X);
			read_lock(Y);
					write_lock(Z);
	write_lock(Y);
			read_lock(Z);
					read_lock(X);

	deadlock.

3.
	CPU1		CPU2		CPU3
	=============	=============	=============
	write_lock(X);
			read_lock(Y);
					read_lock(Z);
	write_lock(Y);
			read_lock(Z);
					write_lock(X);

	not deadlock.

4.
	CPU1		CPU2		CPU3
	=============	=============	=============
	write_lock(X);
			read_lock(Y);
					write_lock(Z);
	read_lock(Y);
			read_lock(Z);
					write_lock(X);

	not deadlock.

Those self testcases are valuable for the development of supporting
recursive read related deadlock detection.

Signed-off-by: Boqun Feng <boqun.feng@gmail.com>