netdev - Re: [PATCH net-next 1/2] fs/crashdd: add API to collect hardware dump in second kernel

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Message-ID: <201803242014.2zYLK1Sn%fengguang.wu@intel.com>
Date:   Sat, 24 Mar 2018 20:29:00 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Rahul Lakkireddy <rahul.lakkireddy@...lsio.com>
Cc:     kbuild-all@...org, netdev@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, kexec@...ts.infradead.org,
        linux-kernel@...r.kernel.org, davem@...emloft.net,
        viro@...iv.linux.org.uk, ebiederm@...ssion.com,
        stephen@...workplumber.org, akpm@...ux-foundation.org,
        torvalds@...ux-foundation.org, ganeshgr@...lsio.com,
        nirranjan@...lsio.com, indranil@...lsio.com,
        Rahul Lakkireddy <rahul.lakkireddy@...lsio.com>
Subject: Re: [PATCH net-next 1/2] fs/crashdd: add API to collect hardware
 dump in second kernel

Hi Rahul,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Rahul-Lakkireddy/fs-crashdd-add-API-to-collect-hardware-dump-in-second-kernel/20180324-193856
config: i386-randconfig-s0-201811 (attached as .config)
compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   In file included from fs/crashdd/crashdd.c:8:0:
   fs/crashdd/crashdd_internal.h:13:23: error: field 'bin_attr' has incomplete type
     struct bin_attribute bin_attr; /* Binary dump file's attributes */
                          ^~~~~~~~
   fs/crashdd/crashdd.c: In function 'crashdd_read':
   fs/crashdd/crashdd.c:20:43: error: dereferencing pointer to incomplete type 'struct bin_attribute'
     struct crashdd_dump_node *dump = bin_attr->private;
                                              ^~
   fs/crashdd/crashdd.c: In function 'crashdd_mkdir':
>> fs/crashdd/crashdd.c:28:9: error: implicit declaration of function 'kobject_create_and_add' [-Werror=implicit-function-declaration]
     return kobject_create_and_add(name, crashdd_kobj);
            ^~~~~~~~~~~~~~~~~~~~~~
   fs/crashdd/crashdd.c:28:9: warning: return makes pointer from integer without a cast [-Wint-conversion]
     return kobject_create_and_add(name, crashdd_kobj);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   fs/crashdd/crashdd.c: In function 'crashdd_add_file':
   fs/crashdd/crashdd.c:40:9: error: implicit declaration of function 'sysfs_create_bin_file' [-Werror=implicit-function-declaration]
     return sysfs_create_bin_file(kobj, &dump->bin_attr);
            ^~~~~~~~~~~~~~~~~~~~~
   fs/crashdd/crashdd.c: In function 'crashdd_rmdir':
>> fs/crashdd/crashdd.c:45:2: error: implicit declaration of function 'kobject_put' [-Werror=implicit-function-declaration]
     kobject_put(kobj);
     ^~~~~~~~~~~
   fs/crashdd/crashdd.c: In function 'crashdd_get_driver':
   fs/crashdd/crashdd.c:102:25: error: dereferencing pointer to incomplete type 'struct kobject'
      if (!strcmp(node->kobj->name, name)) {
                            ^~
   fs/crashdd/crashdd.c: In function 'crashdd_init':
>> fs/crashdd/crashdd.c:228:51: error: 'kernel_kobj' undeclared (first use in this function)
     crashdd_kobj = kobject_create_and_add("crashdd", kernel_kobj);
                                                      ^~~~~~~~~~~
   fs/crashdd/crashdd.c:228:51: note: each undeclared identifier is reported only once for each function it appears in
   fs/crashdd/crashdd.c: In function 'crashdd_add_file':
   fs/crashdd/crashdd.c:41:1: warning: control reaches end of non-void function [-Wreturn-type]
    }
    ^
   cc1: some warnings being treated as errors

vim +/kobject_create_and_add +28 fs/crashdd/crashdd.c

     7	
   > 8	#include "crashdd_internal.h"
     9	
    10	static LIST_HEAD(crashdd_list);
    11	static DEFINE_MUTEX(crashdd_mutex);
    12	
    13	#define CRASHDD_SYSFS_MODE 444 /* S_IRUGO */
    14	static struct kobject *crashdd_kobj;
    15	
    16	static ssize_t crashdd_read(struct file *filp, struct kobject *kobj,
    17				    struct bin_attribute *bin_attr,
    18				    char *buf, loff_t fpos, size_t count)
    19	{
    20		struct crashdd_dump_node *dump = bin_attr->private;
    21	
    22		memcpy(buf, dump->buf + fpos, count);
    23		return count;
    24	}
    25	
    26	static struct kobject *crashdd_mkdir(const char *name)
    27	{
  > 28		return kobject_create_and_add(name, crashdd_kobj);
    29	}
    30	
    31	static int crashdd_add_file(struct kobject *kobj, const char *name,
    32				    struct crashdd_dump_node *dump)
    33	{
    34		dump->bin_attr.attr.name = name;
    35		dump->bin_attr.attr.mode = CRASHDD_SYSFS_MODE;
    36		dump->bin_attr.size = dump->size;
    37		dump->bin_attr.read = crashdd_read;
    38		dump->bin_attr.private = dump;
    39	
    40		return sysfs_create_bin_file(kobj, &dump->bin_attr);
    41	}
    42	
    43	static void crashdd_rmdir(struct kobject *kobj)
    44	{
  > 45		kobject_put(kobj);
    46	}
    47	

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