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Date: Mon, 30 Mar 2020 17:29:51 +0200
From: Uladzislau Rezki <urezki@...il.com>
To: "Joel Fernandes (Google)" <joel@...lfernandes.org>
Cc: "Joel Fernandes (Google)" <joel@...lfernandes.org>,
kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
"Uladzislau Rezki (Sony)" <urezki@...il.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Ingo Molnar <mingo@...hat.com>,
Josh Triplett <josh@...htriplett.org>,
Lai Jiangshan <jiangshanlai@...il.com>, linux-mm@...ck.org,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
"Paul E. McKenney" <paulmck@...nel.org>,
"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
rcu@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 10/18] rcu/tree: Maintain separate array for vmalloc ptrs
Hello, Joel.
Sent out the patch fixing build error.
--
Vlad Rezki
> Hi "Joel,
>
> Thank you for the patch! Yet something to improve:
>
> [auto build test ERROR on rcu/dev]
> [also build test ERROR on rcu/rcu/next next-20200327]
> [cannot apply to linus/master linux/master v5.6]
> [if your patch is applied to the wrong git tree, please drop us a note to help
> improve the system. BTW, we also suggest to use '--base' option to specify the
> base tree in git format-patch, please see https://stackoverflow.com/a/37406982]
>
> url: https://github.com/0day-ci/linux/commits/Joel-Fernandes-Google/kfree_rcu-improvements-for-rcu-dev/20200330-113719
> base: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev
> config: mips-randconfig-a001-20200330 (attached as .config)
> compiler: mips64el-linux-gcc (GCC) 5.5.0
> reproduce:
> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> chmod +x ~/bin/make.cross
> # save the attached .config to linux build tree
> GCC_VERSION=5.5.0 make.cross ARCH=mips
>
> If you fix the issue, kindly add following tag
> Reported-by: kbuild test robot <lkp@...el.com>
>
> All errors (new ones prefixed by >>):
>
> kernel/rcu/tree.c: In function 'kfree_rcu_work':
> >> kernel/rcu/tree.c:2946:4: error: implicit declaration of function 'vfree' [-Werror=implicit-function-declaration]
> vfree(bvhead->records[i]);
> ^
> cc1: some warnings being treated as errors
>
> vim +/vfree +2946 kernel/rcu/tree.c
>
> 2884
> 2885 /*
> 2886 * This function is invoked in workqueue context after a grace period.
> 2887 * It frees all the objects queued on ->bhead_free or ->head_free.
> 2888 */
> 2889 static void kfree_rcu_work(struct work_struct *work)
> 2890 {
> 2891 unsigned long flags;
> 2892 struct kvfree_rcu_bulk_data *bkhead, *bknext;
> 2893 struct kvfree_rcu_bulk_data *bvhead, *bvnext;
> 2894 struct rcu_head *head, *next;
> 2895 struct kfree_rcu_cpu *krcp;
> 2896 struct kfree_rcu_cpu_work *krwp;
> 2897 int i;
> 2898
> 2899 krwp = container_of(to_rcu_work(work),
> 2900 struct kfree_rcu_cpu_work, rcu_work);
> 2901
> 2902 krcp = krwp->krcp;
> 2903 spin_lock_irqsave(&krcp->lock, flags);
> 2904 /* Channel 1. */
> 2905 bkhead = krwp->bkvhead_free[0];
> 2906 krwp->bkvhead_free[0] = NULL;
> 2907
> 2908 /* Channel 2. */
> 2909 bvhead = krwp->bkvhead_free[1];
> 2910 krwp->bkvhead_free[1] = NULL;
> 2911
> 2912 /* Channel 3. */
> 2913 head = krwp->head_free;
> 2914 krwp->head_free = NULL;
> 2915 spin_unlock_irqrestore(&krcp->lock, flags);
> 2916
> 2917 /* kmalloc()/kfree() channel. */
> 2918 for (; bkhead; bkhead = bknext) {
> 2919 bknext = bkhead->next;
> 2920
> 2921 debug_rcu_bhead_unqueue(bkhead);
> 2922
> 2923 rcu_lock_acquire(&rcu_callback_map);
> 2924 trace_rcu_invoke_kfree_bulk_callback(rcu_state.name,
> 2925 bkhead->nr_records, bkhead->records);
> 2926
> 2927 kfree_bulk(bkhead->nr_records, bkhead->records);
> 2928 rcu_lock_release(&rcu_callback_map);
> 2929
> 2930 if (cmpxchg(&krcp->bkvcache[0], NULL, bkhead))
> 2931 free_page((unsigned long) bkhead);
> 2932
> 2933 cond_resched_tasks_rcu_qs();
> 2934 }
> 2935
> 2936 /* vmalloc()/vfree() channel. */
> 2937 for (; bvhead; bvhead = bvnext) {
> 2938 bvnext = bvhead->next;
> 2939
> 2940 debug_rcu_bhead_unqueue(bvhead);
> 2941
> 2942 rcu_lock_acquire(&rcu_callback_map);
> 2943 for (i = 0; i < bvhead->nr_records; i++) {
> 2944 trace_rcu_invoke_kvfree_callback(rcu_state.name,
> 2945 (struct rcu_head *) bvhead->records[i], 0);
> > 2946 vfree(bvhead->records[i]);
> 2947 }
> 2948 rcu_lock_release(&rcu_callback_map);
> 2949
> 2950 if (cmpxchg(&krcp->bkvcache[1], NULL, bvhead))
> 2951 free_page((unsigned long) bvhead);
> 2952
> 2953 cond_resched_tasks_rcu_qs();
> 2954 }
> 2955
> 2956 /*
> 2957 * This path covers emergency case only due to high
> 2958 * memory pressure also means low memory condition,
> 2959 * when we could not allocate a bulk array.
> 2960 *
> 2961 * Under that condition an object is queued to the
> 2962 * list instead.
> 2963 */
> 2964 for (; head; head = next) {
> 2965 unsigned long offset = (unsigned long)head->func;
> 2966 void *ptr = (void *)head - offset;
> 2967
> 2968 next = head->next;
> 2969 debug_rcu_head_unqueue((struct rcu_head *)ptr);
> 2970 rcu_lock_acquire(&rcu_callback_map);
> 2971 trace_rcu_invoke_kvfree_callback(rcu_state.name, head, offset);
> 2972
> 2973 if (!WARN_ON_ONCE(!__is_kvfree_rcu_offset(offset)))
> 2974 kvfree(ptr);
> 2975
> 2976 rcu_lock_release(&rcu_callback_map);
> 2977 cond_resched_tasks_rcu_qs();
> 2978 }
> 2979 }
> 2980
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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