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SubjectRe: [PATCH v2 1/8] rcu: Introduce call_rcu_lazy() API implementation
Hi "Joel,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v5.19-rc3 next-20220622]
[cannot apply to paulmck-rcu/dev]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url: https://github.com/intel-lab-lkp/linux/commits/Joel-Fernandes-Google/Implement-call_rcu_lazy-and-miscellaneous-fixes/20220623-065447
base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git de5c208d533a46a074eb46ea17f672cc005a7269
config: riscv-nommu_k210_defconfig (https://download.01.org/0day-ci/archive/20220623/202206230916.2YtpR3sO-lkp@intel.com/config)
compiler: riscv64-linux-gcc (GCC) 11.3.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/intel-lab-lkp/linux/commit/543ee31928d1cff057320ff64603283a34fe0052
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Joel-Fernandes-Google/Implement-call_rcu_lazy-and-miscellaneous-fixes/20220623-065447
git checkout 543ee31928d1cff057320ff64603283a34fe0052
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash kernel/rcu/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

kernel/rcu/tree.c:3103: warning: Function parameter or member 'lazy' not described in '__call_rcu_common'
>> kernel/rcu/tree.c:3103: warning: expecting prototype for call_rcu(). Prototype was for __call_rcu_common() instead


vim +3103 kernel/rcu/tree.c

b2b00ddf193bf83 kernel/rcu/tree.c Paul E. McKenney 2019-10-30 3060
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3061 /**
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3062 * call_rcu() - Queue an RCU callback for invocation after a grace period.
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3063 * @head: structure to be used for queueing the RCU updates.
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3064 * @func: actual callback function to be invoked after the grace period
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3065 *
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3066 * The callback function will be invoked some time after a full grace
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3067 * period elapses, in other words after all pre-existing RCU read-side
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3068 * critical sections have completed. However, the callback function
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3069 * might well execute concurrently with RCU read-side critical sections
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3070 * that started after call_rcu() was invoked.
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3071 *
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3072 * RCU read-side critical sections are delimited by rcu_read_lock()
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3073 * and rcu_read_unlock(), and may be nested. In addition, but only in
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3074 * v5.0 and later, regions of code across which interrupts, preemption,
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3075 * or softirqs have been disabled also serve as RCU read-side critical
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3076 * sections. This includes hardware interrupt handlers, softirq handlers,
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3077 * and NMI handlers.
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3078 *
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3079 * Note that all CPUs must agree that the grace period extended beyond
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3080 * all pre-existing RCU read-side critical section. On systems with more
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3081 * than one CPU, this means that when "func()" is invoked, each CPU is
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3082 * guaranteed to have executed a full memory barrier since the end of its
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3083 * last RCU read-side critical section whose beginning preceded the call
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3084 * to call_rcu(). It also means that each CPU executing an RCU read-side
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3085 * critical section that continues beyond the start of "func()" must have
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3086 * executed a memory barrier after the call_rcu() but before the beginning
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3087 * of that RCU read-side critical section. Note that these guarantees
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3088 * include CPUs that are offline, idle, or executing in user mode, as
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3089 * well as CPUs that are executing in the kernel.
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3090 *
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3091 * Furthermore, if CPU A invoked call_rcu() and CPU B invoked the
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3092 * resulting RCU callback function "func()", then both CPU A and CPU B are
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3093 * guaranteed to execute a full memory barrier during the time interval
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3094 * between the call to call_rcu() and the invocation of "func()" -- even
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3095 * if CPU A and CPU B are the same CPU (but again only if the system has
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3096 * more than one CPU).
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3097 *
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3098 * Implementation of these memory-ordering guarantees is described here:
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3099 * Documentation/RCU/Design/Memory-Ordering/Tree-RCU-Memory-Ordering.rst.
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3100 */
543ee31928d1cff kernel/rcu/tree.c Joel Fernandes (Google 2022-06-22 3101) static void
543ee31928d1cff kernel/rcu/tree.c Joel Fernandes (Google 2022-06-22 3102) __call_rcu_common(struct rcu_head *head, rcu_callback_t func, bool lazy)
64db4cfff99c04c kernel/rcutree.c Paul E. McKenney 2008-12-18 @3103 {
b4b7914a6a73fc1 kernel/rcu/tree.c Paul E. McKenney 2020-12-08 3104 static atomic_t doublefrees;
64db4cfff99c04c kernel/rcutree.c Paul E. McKenney 2008-12-18 3105 unsigned long flags;
64db4cfff99c04c kernel/rcutree.c Paul E. McKenney 2008-12-18 3106 struct rcu_data *rdp;
5d6742b37727e11 kernel/rcu/tree.c Paul E. McKenney 2019-05-15 3107 bool was_alldone;
64db4cfff99c04c kernel/rcutree.c Paul E. McKenney 2008-12-18 3108
b8f2ed538477d9a kernel/rcu/tree.c Paul E. McKenney 2016-08-23 3109 /* Misaligned rcu_head! */
b8f2ed538477d9a kernel/rcu/tree.c Paul E. McKenney 2016-08-23 3110 WARN_ON_ONCE((unsigned long)head & (sizeof(void *) - 1));
b8f2ed538477d9a kernel/rcu/tree.c Paul E. McKenney 2016-08-23 3111
ae15018456c44b7 kernel/rcutree.c Paul E. McKenney 2013-04-23 3112 if (debug_rcu_head_queue(head)) {
fa3c66476975abf kernel/rcu/tree.c Paul E. McKenney 2017-05-03 3113 /*
fa3c66476975abf kernel/rcu/tree.c Paul E. McKenney 2017-05-03 3114 * Probable double call_rcu(), so leak the callback.
fa3c66476975abf kernel/rcu/tree.c Paul E. McKenney 2017-05-03 3115 * Use rcu:rcu_callback trace event to find the previous
1fe09ebe7a9c990 kernel/rcu/tree.c Paul E. McKenney 2021-12-18 3116 * time callback was passed to call_rcu().
fa3c66476975abf kernel/rcu/tree.c Paul E. McKenney 2017-05-03 3117 */
b4b7914a6a73fc1 kernel/rcu/tree.c Paul E. McKenney 2020-12-08 3118 if (atomic_inc_return(&doublefrees) < 4) {
b4b7914a6a73fc1 kernel/rcu/tree.c Paul E. McKenney 2020-12-08 3119 pr_err("%s(): Double-freed CB %p->%pS()!!! ", __func__, head, head->func);
b4b7914a6a73fc1 kernel/rcu/tree.c Paul E. McKenney 2020-12-08 3120 mem_dump_obj(head);
b4b7914a6a73fc1 kernel/rcu/tree.c Paul E. McKenney 2020-12-08 3121 }
7d0ae8086b82831 kernel/rcu/tree.c Paul E. McKenney 2015-03-03 3122 WRITE_ONCE(head->func, rcu_leak_callback);
ae15018456c44b7 kernel/rcutree.c Paul E. McKenney 2013-04-23 3123 return;
ae15018456c44b7 kernel/rcutree.c Paul E. McKenney 2013-04-23 3124 }
64db4cfff99c04c kernel/rcutree.c Paul E. McKenney 2008-12-18 3125 head->func = func;
64db4cfff99c04c kernel/rcutree.c Paul E. McKenney 2008-12-18 3126 head->next = NULL;
300c0c5e721834f kernel/rcu/tree.c Jun Miao 2021-11-16 3127 kasan_record_aux_stack_noalloc(head);
d818cc76e2b4d5f kernel/rcu/tree.c Zqiang 2021-12-26 3128 local_irq_save(flags);
da1df50d16171f4 kernel/rcu/tree.c Paul E. McKenney 2018-07-03 3129 rdp = this_cpu_ptr(&rcu_data);
64db4cfff99c04c kernel/rcutree.c Paul E. McKenney 2008-12-18 3130
64db4cfff99c04c kernel/rcutree.c Paul E. McKenney 2008-12-18 3131 /* Add the callback to our list. */
5d6742b37727e11 kernel/rcu/tree.c Paul E. McKenney 2019-05-15 3132 if (unlikely(!rcu_segcblist_is_enabled(&rdp->cblist))) {
5d6742b37727e11 kernel/rcu/tree.c Paul E. McKenney 2019-05-15 3133 // This can trigger due to call_rcu() from offline CPU:
5d6742b37727e11 kernel/rcu/tree.c Paul E. McKenney 2019-05-15 3134 WARN_ON_ONCE(rcu_scheduler_active != RCU_SCHEDULER_INACTIVE);
34404ca8fb252cc kernel/rcu/tree.c Paul E. McKenney 2015-01-19 3135 WARN_ON_ONCE(!rcu_is_watching());
5d6742b37727e11 kernel/rcu/tree.c Paul E. McKenney 2019-05-15 3136 // Very early boot, before rcu_init(). Initialize if needed
5d6742b37727e11 kernel/rcu/tree.c Paul E. McKenney 2019-05-15 3137 // and then drop through to queue the callback.
15fecf89e46a962 kernel/rcu/tree.c Paul E. McKenney 2017-02-08 3138 if (rcu_segcblist_empty(&rdp->cblist))
15fecf89e46a962 kernel/rcu/tree.c Paul E. McKenney 2017-02-08 3139 rcu_segcblist_init(&rdp->cblist);
143da9c2fc030a5 kernel/rcu/tree.c Paul E. McKenney 2015-01-19 3140 }
77a40f97030b27b kernel/rcu/tree.c Joel Fernandes (Google 2019-08-30 3141)
b2b00ddf193bf83 kernel/rcu/tree.c Paul E. McKenney 2019-10-30 3142 check_cb_ovld(rdp);
543ee31928d1cff kernel/rcu/tree.c Joel Fernandes (Google 2022-06-22 3143) if (rcu_nocb_try_bypass(rdp, head, &was_alldone, flags, lazy))
d1b222c6be1f8bf kernel/rcu/tree.c Paul E. McKenney 2019-07-02 3144 return; // Enqueued onto ->nocb_bypass, so just leave.
b692dc4adfcff54 kernel/rcu/tree.c Paul E. McKenney 2020-02-11 3145 // If no-CBs CPU gets here, rcu_nocb_try_bypass() acquired ->nocb_lock.
77a40f97030b27b kernel/rcu/tree.c Joel Fernandes (Google 2019-08-30 3146) rcu_segcblist_enqueue(&rdp->cblist, head);
c408b215f58f715 kernel/rcu/tree.c Uladzislau Rezki (Sony 2020-05-25 3147) if (__is_kvfree_rcu_offset((unsigned long)func))
c408b215f58f715 kernel/rcu/tree.c Uladzislau Rezki (Sony 2020-05-25 3148) trace_rcu_kvfree_callback(rcu_state.name, head,
3c779dfef2c4524 kernel/rcu/tree.c Paul E. McKenney 2018-07-05 3149 (unsigned long)func,
15fecf89e46a962 kernel/rcu/tree.c Paul E. McKenney 2017-02-08 3150 rcu_segcblist_n_cbs(&rdp->cblist));
d4c08f2ac311a36 kernel/rcutree.c Paul E. McKenney 2011-06-25 3151 else
3c779dfef2c4524 kernel/rcu/tree.c Paul E. McKenney 2018-07-05 3152 trace_rcu_callback(rcu_state.name, head,
15fecf89e46a962 kernel/rcu/tree.c Paul E. McKenney 2017-02-08 3153 rcu_segcblist_n_cbs(&rdp->cblist));
d4c08f2ac311a36 kernel/rcutree.c Paul E. McKenney 2011-06-25 3154
3afe7fa535491ec kernel/rcu/tree.c Joel Fernandes (Google 2020-11-14 3155) trace_rcu_segcb_stats(&rdp->cblist, TPS("SegCBQueued"));
3afe7fa535491ec kernel/rcu/tree.c Joel Fernandes (Google 2020-11-14 3156)
29154c57e35a191 kernel/rcutree.c Paul E. McKenney 2012-05-30 3157 /* Go handle any RCU core processing required. */
3820b513a2e33d6 kernel/rcu/tree.c Frederic Weisbecker 2020-11-12 3158 if (unlikely(rcu_rdp_is_offloaded(rdp))) {
5d6742b37727e11 kernel/rcu/tree.c Paul E. McKenney 2019-05-15 3159 __call_rcu_nocb_wake(rdp, was_alldone, flags); /* unlocks */
5d6742b37727e11 kernel/rcu/tree.c Paul E. McKenney 2019-05-15 3160 } else {
5c7d89676bc5196 kernel/rcu/tree.c Paul E. McKenney 2018-07-03 3161 __call_rcu_core(rdp, head, flags);
64db4cfff99c04c kernel/rcutree.c Paul E. McKenney 2008-12-18 3162 local_irq_restore(flags);
64db4cfff99c04c kernel/rcutree.c Paul E. McKenney 2008-12-18 3163 }
5d6742b37727e11 kernel/rcu/tree.c Paul E. McKenney 2019-05-15 3164 }
64db4cfff99c04c kernel/rcutree.c Paul E. McKenney 2008-12-18 3165

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