linux-kernel - [rcu:dev.2019.09.23a 50/77] kernel//rcu/update.c:871:3: note: in expansion of macro 'kfree

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Date:   Tue, 24 Sep 2019 11:53:09 +0800
From:   kbuild test robot <lkp@...el.com>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org
Subject: [rcu:dev.2019.09.23a 50/77] kernel//rcu/update.c:871:3: note: in
 expansion of macro 'kfree_rcu'

tree:   https://kernel.googlesource.com/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2019.09.23a
head:   97de53b94582c208ee239178b208b8e8b9472585
commit: 89538f9f8dda5e7738d71f179f9321740b680734 [50/77] rcu: Add crude self-test for early boot kfree_rcu()
config: sparc64-allmodconfig (attached as .config)
compiler: sparc64-linux-gcc (GCC) 7.4.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 89538f9f8dda5e7738d71f179f9321740b680734
        # save the attached .config to linux build tree
        GCC_VERSION=7.4.0 make.cross ARCH=sparc64 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@...el.com>

Note: the rcu/dev.2019.09.23a HEAD 97de53b94582c208ee239178b208b8e8b9472585 builds fine.
      It only hurts bisectibility.

All error/warnings (new ones prefixed by >>):

   kernel//rcu/update.c: In function 'early_boot_test_call_rcu':
>> kernel//rcu/update.c:869:8: error: implicit declaration of function 'kmalloc'; did you mean 'kvmalloc'? [-Werror=implicit-function-declaration]
     rhp = kmalloc(sizeof(*rhp), GFP_KERNEL);
           ^~~~~~~
           kvmalloc
>> kernel//rcu/update.c:869:6: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
     rhp = kmalloc(sizeof(*rhp), GFP_KERNEL);
         ^
   In file included from include/linux/rbtree.h:22:0,
                    from include/linux/hrtimer.h:16,
                    from include/linux/interrupt.h:13,
                    from kernel//rcu/update.c:25:
>> include/linux/rcupdate.h:840:15: error: passing argument 1 of 'kfree_call_rcu' from incompatible pointer type [-Werror=incompatible-pointer-types]
      __kfree_rcu(&((___p)->rhf), offsetof(typeof(*(ptr)), rhf)); \
                  ^
   include/linux/rcupdate.h:806:18: note: in definition of macro '__kfree_rcu'
      kfree_call_rcu(head, (rcu_callback_t)(unsigned long)(offset)); \
                     ^~~~
>> kernel//rcu/update.c:871:3: note: in expansion of macro 'kfree_rcu'
      kfree_rcu(rhp, rh);
      ^~~~~~~~~
   In file included from include/linux/rcupdate.h:171:0,
                    from include/linux/rbtree.h:22,
                    from include/linux/hrtimer.h:16,
                    from include/linux/interrupt.h:13,
                    from kernel//rcu/update.c:25:
   include/linux/rcutree.h:36:6: note: expected 'struct callback_head *' but argument is of type 'struct callback_head **'
    void kfree_call_rcu(struct rcu_head *head, rcu_callback_t func);
         ^~~~~~~~~~~~~~
   cc1: some warnings being treated as errors
--
   kernel/rcu/update.c: In function 'early_boot_test_call_rcu':
   kernel/rcu/update.c:869:8: error: implicit declaration of function 'kmalloc'; did you mean 'kvmalloc'? [-Werror=implicit-function-declaration]
     rhp = kmalloc(sizeof(*rhp), GFP_KERNEL);
           ^~~~~~~
           kvmalloc
   kernel/rcu/update.c:869:6: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
     rhp = kmalloc(sizeof(*rhp), GFP_KERNEL);
         ^
   In file included from include/linux/rbtree.h:22:0,
                    from include/linux/hrtimer.h:16,
                    from include/linux/interrupt.h:13,
                    from kernel/rcu/update.c:25:
>> include/linux/rcupdate.h:840:15: error: passing argument 1 of 'kfree_call_rcu' from incompatible pointer type [-Werror=incompatible-pointer-types]
      __kfree_rcu(&((___p)->rhf), offsetof(typeof(*(ptr)), rhf)); \
                  ^
   include/linux/rcupdate.h:806:18: note: in definition of macro '__kfree_rcu'
      kfree_call_rcu(head, (rcu_callback_t)(unsigned long)(offset)); \
                     ^~~~
   kernel/rcu/update.c:871:3: note: in expansion of macro 'kfree_rcu'
      kfree_rcu(rhp, rh);
      ^~~~~~~~~
   In file included from include/linux/rcupdate.h:171:0,
                    from include/linux/rbtree.h:22,
                    from include/linux/hrtimer.h:16,
                    from include/linux/interrupt.h:13,
                    from kernel/rcu/update.c:25:
   include/linux/rcutree.h:36:6: note: expected 'struct callback_head *' but argument is of type 'struct callback_head **'
    void kfree_call_rcu(struct rcu_head *head, rcu_callback_t func);
         ^~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/kfree_rcu +871 kernel//rcu/update.c

   859	
   860	static void early_boot_test_call_rcu(void)
   861	{
   862		static struct rcu_head head;
   863		static struct rcu_head shead;
   864		struct early_boot_kfree_rcu *rhp;
   865	
   866		call_rcu(&head, test_callback);
   867		if (IS_ENABLED(CONFIG_SRCU))
   868			call_srcu(&early_srcu, &shead, test_callback);
 > 869		rhp = kmalloc(sizeof(*rhp), GFP_KERNEL);
   870		if (!WARN_ON_ONCE(!rhp))
 > 871			kfree_rcu(rhp, rh);
   872	}
   873	

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