linux-kernel - [rcu:rcu/next 91/92] include/linux/srcutiny.h:96:2: note: in expansion of macro 'pr

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Date:   Thu, 25 May 2017 02:56:41 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org
Subject: [rcu:rcu/next 91/92] include/linux/srcutiny.h:96:2: note: in
 expansion of macro 'pr_alert'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/next
head:   71328ca7428fb7f5dfc146ee59ad9736df623cf3
commit: 54ffb22bd8416ef9188dbe005b52ee5a1b5f6e5e [91/92] rcutorture: Move SRCU status printing to SRCU implementations
config: blackfin-allmodconfig (attached as .config)
compiler: bfin-uclinux-gcc (GCC) 6.2.0
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 54ffb22bd8416ef9188dbe005b52ee5a1b5f6e5e
        # save the attached .config to linux build tree
        make.cross ARCH=blackfin 

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

   include/linux/srcutiny.h: In function 'srcu_torture_stats_print':
>> arch/blackfin/kernel/module.c:7:40: error: 'mod' undeclared (first use in this function)
    #define pr_fmt(fmt) "module %s: " fmt, mod->name
                                           ^
   include/linux/printk.h:297:20: note: in expansion of macro 'pr_fmt'
     printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
                       ^~~~~~
>> include/linux/srcutiny.h:96:2: note: in expansion of macro 'pr_alert'
     pr_alert("%s%s Tiny SRCU per-CPU(idx=%d): (%hd,%hd)\n",
     ^~~~~~~~
   arch/blackfin/kernel/module.c:7:40: note: each undeclared identifier is reported only once for each function it appears in
    #define pr_fmt(fmt) "module %s: " fmt, mod->name
                                           ^
   include/linux/printk.h:297:20: note: in expansion of macro 'pr_fmt'
     printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
                       ^~~~~~
>> include/linux/srcutiny.h:96:2: note: in expansion of macro 'pr_alert'
     pr_alert("%s%s Tiny SRCU per-CPU(idx=%d): (%hd,%hd)\n",
     ^~~~~~~~

vim +/pr_alert +96 include/linux/srcutiny.h

    80	{
    81		synchronize_srcu(sp);
    82	}
    83	
    84	static inline void srcu_barrier(struct srcu_struct *sp)
    85	{
    86		synchronize_srcu(sp);
    87	}
    88	
    89	/* Defined here to avoid size increase for non-torture kernels. */
    90	static inline void srcu_torture_stats_print(struct srcu_struct *sp,
    91						    char *tt, char *tf)
    92	{
    93		int idx;
    94	
    95		idx = READ_ONCE(sp->srcu_idx) & 0x1;
  > 96		pr_alert("%s%s Tiny SRCU per-CPU(idx=%d): (%hd,%hd)\n",
    97			 tt, tf, idx,
    98			 READ_ONCE(sp->srcu_lock_nesting[!idx]),
    99			 READ_ONCE(sp->srcu_lock_nesting[idx]));
   100	}
   101	
   102	#endif

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