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

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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: Paul 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: Boqun Feng <boqun.feng@gmail.com>
This commit is contained in:
Paul E. McKenney 2025-01-09 13:24:44 -08:00 committed by Boqun Feng
parent c402062052
commit 176d19eecb
1 changed files with 9 additions and 0 deletions
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9
kernel/rcu/rcutorture.c
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@ -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)