diff options
| author | Tejun Heo <tj@kernel.org> | 2025-09-23 20:38:23 -1000 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2025-09-23 20:38:23 -1000 |
| commit | df10932ad740ba1f871b6dd2ddafc7dc8cea944f (patch) | |
| tree | 518224b1fe9264ed072b6b8da58aa07001e3fd9a /kernel/sched/ext.c | |
| parent | sched_ext: Merge branch 'for-6.17-fixes' into for-6.18 (diff) | |
| download | linux-df10932ad740ba1f871b6dd2ddafc7dc8cea944f.tar.gz linux-df10932ad740ba1f871b6dd2ddafc7dc8cea944f.zip | |
Revert "sched_ext: Use rhashtable_lookup() instead of rhashtable_lookup_fast()"
This reverts commit c8191ee8e64a8c5c021a34e32868f2380965e82b which triggers
the following suspicious RCU usage warning:
[ 6.647598] =============================
[ 6.647603] WARNING: suspicious RCU usage
[ 6.647605] 6.17.0-rc7-virtme #1 Not tainted
[ 6.647608] -----------------------------
[ 6.647608] ./include/linux/rhashtable.h:602 suspicious rcu_dereference_check() usage!
[ 6.647610]
[ 6.647610] other info that might help us debug this:
[ 6.647610]
[ 6.647612]
[ 6.647612] rcu_scheduler_active = 2, debug_locks = 1
[ 6.647613] 1 lock held by swapper/10/0:
[ 6.647614] #0: ffff8b14bbb3cc98 (&rq->__lock){-.-.}-{2:2}, at:
+raw_spin_rq_lock_nested+0x20/0x90
[ 6.647630]
[ 6.647630] stack backtrace:
[ 6.647633] CPU: 10 UID: 0 PID: 0 Comm: swapper/10 Not tainted 6.17.0-rc7-virtme #1
+PREEMPT(full)
[ 6.647643] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 6.647646] Sched_ext: beerland_1.0.2_g27d63fc3_x86_64_unknown_linux_gnu (enabled+all)
[ 6.647648] Call Trace:
[ 6.647652] <IRQ>
[ 6.647655] dump_stack_lvl+0x78/0xe0
[ 6.647665] lockdep_rcu_suspicious+0x14a/0x1b0
[ 6.647672] __rhashtable_lookup.constprop.0+0x1d5/0x250
[ 6.647680] find_dsq_for_dispatch+0xbc/0x190
[ 6.647684] do_enqueue_task+0x25b/0x550
[ 6.647689] enqueue_task_scx+0x21d/0x360
[ 6.647692] ? trace_lock_acquire+0x22/0xb0
[ 6.647695] enqueue_task+0x2e/0xd0
[ 6.647698] ttwu_do_activate+0xa2/0x290
[ 6.647703] sched_ttwu_pending+0xfd/0x250
[ 6.647706] __flush_smp_call_function_queue+0x1cd/0x610
[ 6.647714] __sysvec_call_function_single+0x34/0x150
[ 6.647720] sysvec_call_function_single+0x6e/0x80
[ 6.647726] </IRQ>
[ 6.647726] <TASK>
[ 6.647727] asm_sysvec_call_function_single+0x1a/0x20
Reported-by: Andrea Righi <arighi@nvidia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'kernel/sched/ext.c')
| -rw-r--r-- | kernel/sched/ext.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c index 99a5f6429207..2b0e88206d07 100644 --- a/kernel/sched/ext.c +++ b/kernel/sched/ext.c @@ -189,7 +189,7 @@ static struct scx_dispatch_q *find_global_dsq(struct scx_sched *sch, static struct scx_dispatch_q *find_user_dsq(struct scx_sched *sch, u64 dsq_id) { - return rhashtable_lookup(&sch->dsq_hash, &dsq_id, dsq_hash_params); + return rhashtable_lookup_fast(&sch->dsq_hash, &dsq_id, dsq_hash_params); } /* |