tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2019.09.23a head: 97de53b94582c208ee239178b208b8e8b9472585 commit: 06b68648e6084488b79de47a2cfa307a1b9668b9 [65/77] rcu: Remove kfree_rcu() special casing and lazy-callback handling config: x86_64-randconfig-c004-201938 (attached as .config) compiler: gcc-7 (Debian 7.4.0-13) 7.4.0 reproduce: git checkout 06b68648e6084488b79de47a2cfa307a1b9668b9 # save the attached .config to linux build tree make ARCH=x86_64
If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <l...@intel.com>
All errors (new ones prefixed by >>):
kernel//rcu/tree.c: In function 'kfree_rcu_work':
>> kernel//rcu/tree.c:2770:3: error: implicit declaration of function 'kfree';
>> did you mean 'kvfree'? [-Werror=implicit-function-declaration]
kfree((void *)head - offset);
^~~~~
kvfree
cc1: some warnings being treated as errors
vim +2770 kernel//rcu/tree.c
2739
2740 /*
2741 * This function is invoked in workqueue context after a grace period.
2742 * It frees all the objects queued on ->head_free.
2743 */
2744 static void kfree_rcu_work(struct work_struct *work)
2745 {
2746 unsigned long flags;
2747 struct rcu_head *head, *next;
2748 struct kfree_rcu_cpu *krcp;
2749 struct kfree_rcu_cpu_work *krwp;
2750
2751 krwp = container_of(to_rcu_work(work),
2752 struct kfree_rcu_cpu_work, rcu_work);
2753 krcp = krwp->krcp;
2754 spin_lock_irqsave(&krcp->lock, flags);
2755 head = krwp->head_free;
2756 krwp->head_free = NULL;
2757 spin_unlock_irqrestore(&krcp->lock, flags);
2758
2759 // List "head" is now private, so traverse locklessly.
2760 for (; head; head = next) {
2761 unsigned long offset = (unsigned long)head->func;
2762
2763 next = head->next;
2764 // Potentially optimize with kfree_bulk in future.
2765 debug_rcu_head_unqueue(head);
2766 rcu_lock_acquire(&rcu_callback_map);
2767 trace_rcu_invoke_kfree_callback(rcu_state.name, head,
offset);
2768
2769 /* Could be possible to optimize with kfree_bulk in
future */
> 2770 kfree((void *)head - offset);
2771
2772 rcu_lock_release(&rcu_callback_map);
2773 cond_resched_tasks_rcu_qs();
2774 }
2775 }
2776
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.config.gz
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