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rcutorture: Add srcu_read_lock_lite() support to rcutorture.reader_flavor

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This commit causes bit 0x4 of rcutorture.reader_flavor to select the new
srcu_read_lock_lite() and srcu_read_unlock_lite() functions.

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>
Reviewed-by: Neeraj Upadhyay <Neeraj.Upadhyay@amd.com>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
This commit is contained in:
Paul E. McKenney 2024-10-15 09:11:09 -07:00 committed by Frederic Weisbecker
parent 95a5de2154
commit 43349fc4d8
2 changed files with 9 additions and 2 deletions
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4
Documentation/admin-guide/kernel-parameters.txt
View File

@ -5431,8 +5431,8 @@
If there is more than one bit set, the readers
are entered from low-order bit up, and are
exited in the opposite order. For SRCU, the
0x1 bit is normal readers and the 0x2 bit is
for NMI-safe readers.
0x1 bit is normal readers, 0x2 NMI-safe readers,
and 0x4 light-weight readers.
rcutorture.shuffle_interval= [KNL]
Set task-shuffle interval (s). Shuffling tasks

7
kernel/rcu/rcutorture.c
View File

@ -658,6 +658,11 @@ static int srcu_torture_read_lock(void)
WARN_ON_ONCE(idx & ~0x1);
ret += idx << 1;
}
if (reader_flavor & 0x4) {
idx = srcu_read_lock_lite(srcu_ctlp);
WARN_ON_ONCE(idx & ~0x1);
ret += idx << 2;
}
return ret;
}
@ -683,6 +688,8 @@ 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 & 0x4)
srcu_read_unlock_lite(srcu_ctlp, (idx & 0x4) >> 2);
if (reader_flavor & 0x2)
srcu_read_unlock_nmisafe(srcu_ctlp, (idx & 0x2) >> 1);
if ((reader_flavor & 0x1) || !(reader_flavor & 0x7))