Commit 176d19ee authored by Paul E. McKenney's avatar Paul E. McKenney Committed by Boqun Feng
Browse files

rcutorture: Add ability to test srcu_read_{,un}lock_fast() 



This commit permits rcutorture to test srcu_read_{,un}lock_fast(), which
is specified by the rcutorture.reader_flavor=0x8 kernel boot parameter.

Signed-off-by: default avatarPaul E. McKenney <paulmck@kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: <bpf@vger.kernel.org>
Signed-off-by: default avatarBoqun Feng <boqun.feng@gmail.com>
parent c4020620

kernel/rcu/rcutorture.c

+9 −0
Original line number Diff line number Diff line
@@ -677,6 +677,7 @@ static void srcu_get_gp_data(int *flags, unsigned long *gp_seq) 
static int srcu_torture_read_lock(void)

{

	int idx;

	struct srcu_ctr __percpu *scp;

	int ret = 0;



	if ((reader_flavor & SRCU_READ_FLAVOR_NORMAL) || !(reader_flavor & SRCU_READ_FLAVOR_ALL)) {
@@ -694,6 +695,12 @@ static int srcu_torture_read_lock(void) 
		WARN_ON_ONCE(idx & ~0x1);

		ret += idx << 2;

	}

	if (reader_flavor & SRCU_READ_FLAVOR_FAST) {

		scp = srcu_read_lock_fast(srcu_ctlp);

		idx = __srcu_ptr_to_ctr(srcu_ctlp, scp);

		WARN_ON_ONCE(idx & ~0x1);

		ret += idx << 3;

	}

	return ret;

}
@@ -719,6 +726,8 @@ srcu_read_delay(struct torture_random_state *rrsp, struct rt_read_seg *rtrsp) 
static void srcu_torture_read_unlock(int idx)

{

	WARN_ON_ONCE((reader_flavor && (idx & ~reader_flavor)) || (!reader_flavor && (idx & ~0x1)));

	if (reader_flavor & SRCU_READ_FLAVOR_FAST)

		srcu_read_unlock_fast(srcu_ctlp, __srcu_ctr_to_ptr(srcu_ctlp, (idx & 0x8) >> 3));

	if (reader_flavor & SRCU_READ_FLAVOR_LITE)

		srcu_read_unlock_lite(srcu_ctlp, (idx & 0x4) >> 2);

	if (reader_flavor & SRCU_READ_FLAVOR_NMI)