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| author | Andrew Morton <akpm@linux-foundation.org> | 2024-01-17 21:58:28 +0100 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-01-17 21:58:28 +0100 |
| commit | fe33c0fbed75dd464747c0faaedf94c7d8eb4101 (patch) | |
| tree | 057a9d98ca492c55708baedcc59bf2ea3e2511c7 /kernel/rcu/tree_stall.h | |
| parent | userfaultfd: avoid huge_zero_page in UFFDIO_MOVE (diff) | |
| parent | Merge tag 'exfat-for-6.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/gi... (diff) | |
| download | linux-fe33c0fbed75dd464747c0faaedf94c7d8eb4101.tar.xz linux-fe33c0fbed75dd464747c0faaedf94c7d8eb4101.zip | |
Merge branch 'master' into mm-hotfixes-stable
Diffstat (limited to 'kernel/rcu/tree_stall.h')
| -rw-r--r-- | kernel/rcu/tree_stall.h | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/kernel/rcu/tree_stall.h b/kernel/rcu/tree_stall.h index ac8e86babe44..5d666428546b 100644 --- a/kernel/rcu/tree_stall.h +++ b/kernel/rcu/tree_stall.h @@ -1061,6 +1061,7 @@ static int __init rcu_sysrq_init(void) } early_initcall(rcu_sysrq_init); +#ifdef CONFIG_RCU_CPU_STALL_NOTIFIER ////////////////////////////////////////////////////////////////////////////// // @@ -1081,7 +1082,13 @@ static ATOMIC_NOTIFIER_HEAD(rcu_cpu_stall_notifier_list); */ int rcu_stall_chain_notifier_register(struct notifier_block *n) { - return atomic_notifier_chain_register(&rcu_cpu_stall_notifier_list, n); + int rcsn = rcu_cpu_stall_notifiers; + + WARN(1, "Adding %pS() to RCU stall notifier list (%s).\n", n->notifier_call, + rcsn ? "possibly suppressing RCU CPU stall warnings" : "failed, so all is well"); + if (rcsn) + return atomic_notifier_chain_register(&rcu_cpu_stall_notifier_list, n); + return -EEXIST; } EXPORT_SYMBOL_GPL(rcu_stall_chain_notifier_register); @@ -1115,3 +1122,5 @@ int rcu_stall_notifier_call_chain(unsigned long val, void *v) { return atomic_notifier_call_chain(&rcu_cpu_stall_notifier_list, val, v); } + +#endif // #ifdef CONFIG_RCU_CPU_STALL_NOTIFIER |