Re: [PATCH v2 7/9] trace_uprobe/sdt: Fix multiple update of same reference counter

[kbuild test robot]

Hi Ravi,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on tip/perf/core]
[also build test ERROR on v4.16 next-20180403]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Ravi-Bangoria/trace_uprobe-Support-SDT-markers-having-reference-count-semaphore/20180404-201900
config: i386-randconfig-a0-201813 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   kernel//trace/trace_uprobe.c:947:21: error: variable 'sdt_mmu_notifier_ops' has initializer but incomplete type
    static const struct mmu_notifier_ops sdt_mmu_notifier_ops = {
                        ^
>> kernel//trace/trace_uprobe.c:948:2: error: unknown field 'release' specified in initializer
     .release = sdt_mm_release,
     ^
   kernel//trace/trace_uprobe.c:948:2: warning: excess elements in struct initializer
   kernel//trace/trace_uprobe.c:948:2: warning: (near initialization for 'sdt_mmu_notifier_ops')
   kernel//trace/trace_uprobe.c: In function 'sdt_add_mm_list':
>> kernel//trace/trace_uprobe.c:962:22: error: dereferencing pointer to incomplete type
     mn = kzalloc(sizeof(*mn), GFP_KERNEL);
                         ^
   kernel//trace/trace_uprobe.c:966:4: error: dereferencing pointer to incomplete type
     mn->ops = &sdt_mmu_notifier_ops;
       ^
>> kernel//trace/trace_uprobe.c:967:2: error: implicit declaration of function '__mmu_notifier_register' [-Werror=implicit-function-declaration]
     __mmu_notifier_register(mn, mm);
     ^
   cc1: some warnings being treated as errors

vim +/__mmu_notifier_register +967 kernel//trace/trace_uprobe.c

   946	
 > 947	static const struct mmu_notifier_ops sdt_mmu_notifier_ops = {
 > 948		.release = sdt_mm_release,
   949	};
   950	
   951	static void sdt_add_mm_list(struct trace_uprobe *tu, struct mm_struct *mm)
   952	{
   953		struct mmu_notifier *mn;
   954		struct sdt_mm_list *sml = kzalloc(sizeof(*sml), GFP_KERNEL);
   955	
   956		if (!sml)
   957			return;
   958		sml->mm = mm;
   959		list_add(&(sml->list), &(tu->sml.list));
   960	
   961		/* Register mmu_notifier for this mm. */
 > 962		mn = kzalloc(sizeof(*mn), GFP_KERNEL);
   963		if (!mn)
   964			return;
   965	
   966		mn->ops = &sdt_mmu_notifier_ops;
 > 967		__mmu_notifier_register(mn, mm);
   968	}
   969	

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