Hi Petr,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[cannot apply to v5.4-rc2 next-20191008]
[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/Petr-Mladek/livepatch-Keep-replaced-patches-until-post_patch-callback-is-called/20191003-171833
config: x86_64-randconfig-e004-201940 (attached as .config)
compiler: gcc-7 (Debian 7.4.0-13) 7.4.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

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

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

   lib/livepatch/test_klp_state.c: In function 'allocate_loglevel_state':
>> lib/livepatch/test_klp_state.c:41:25: error: implicit declaration of function 'kzalloc'; did you mean 'kvzalloc'? [-Werror=implicit-function-declaration]
     loglevel_state->data = kzalloc(sizeof(console_loglevel), GFP_KERNEL);
                            ^~~~~~~
                            kvzalloc
>> lib/livepatch/test_klp_state.c:41:23: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
     loglevel_state->data = kzalloc(sizeof(console_loglevel), GFP_KERNEL);
                          ^
   lib/livepatch/test_klp_state.c: In function 'free_loglevel_state':
>> lib/livepatch/test_klp_state.c:85:2: error: implicit declaration of function 'kfree'; did you mean 'kvfree'? [-Werror=implicit-function-declaration]
     kfree(loglevel_state->data);
     ^~~~~
     kvfree
   cc1: some warnings being treated as errors
--
   lib/livepatch/test_klp_state2.c: In function 'allocate_loglevel_state':
>> lib/livepatch/test_klp_state2.c:48:25: error: implicit declaration of function 'kzalloc'; did you mean 'kvzalloc'? [-Werror=implicit-function-declaration]
     loglevel_state->data = kzalloc(sizeof(console_loglevel), GFP_KERNEL);
                            ^~~~~~~
                            kvzalloc
>> lib/livepatch/test_klp_state2.c:48:23: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
     loglevel_state->data = kzalloc(sizeof(console_loglevel), GFP_KERNEL);
                          ^
   lib/livepatch/test_klp_state2.c: In function 'free_loglevel_state':
>> lib/livepatch/test_klp_state2.c:114:2: error: implicit declaration of function 'kfree'; did you mean 'kvfree'? [-Werror=implicit-function-declaration]
     kfree(loglevel_state->data);
     ^~~~~
     kvfree
   cc1: some warnings being treated as errors

vim +41 lib/livepatch/test_klp_state.c

    32	
    33	static int allocate_loglevel_state(void)
    34	{
    35		struct klp_state *loglevel_state;
    36	
    37		loglevel_state = klp_get_state(&patch, CONSOLE_LOGLEVEL_STATE);
    38		if (!loglevel_state)
    39			return -EINVAL;
    40	
  > 41		loglevel_state->data = kzalloc(sizeof(console_loglevel), GFP_KERNEL);
    42		if (!loglevel_state->data)
    43			return -ENOMEM;
    44	
    45		pr_info("%s: allocating space to store console_loglevel\n",
    46			__func__);
    47		return 0;
    48	}
    49	
    50	static void fix_console_loglevel(void)
    51	{
    52		struct klp_state *loglevel_state;
    53	
    54		loglevel_state = klp_get_state(&patch, CONSOLE_LOGLEVEL_STATE);
    55		if (!loglevel_state)
    56			return;
    57	
    58		pr_info("%s: fixing console_loglevel\n", __func__);
    59		*(int *)loglevel_state->data = console_loglevel;
    60		console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
    61	}
    62	
    63	static void restore_console_loglevel(void)
    64	{
    65		struct klp_state *loglevel_state;
    66	
    67		loglevel_state = klp_get_state(&patch, CONSOLE_LOGLEVEL_STATE);
    68		if (!loglevel_state)
    69			return;
    70	
    71		pr_info("%s: restoring console_loglevel\n", __func__);
    72		console_loglevel = *(int *)loglevel_state->data;
    73	}
    74	
    75	static void free_loglevel_state(void)
    76	{
    77		struct klp_state *loglevel_state;
    78	
    79		loglevel_state = klp_get_state(&patch, CONSOLE_LOGLEVEL_STATE);
    80		if (!loglevel_state)
    81			return;
    82	
    83		pr_info("%s: freeing space for the stored console_loglevel\n",
    84			__func__);
  > 85		kfree(loglevel_state->data);
    86	}
    87	

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