[linux-next:master 3942/14131] kernel/trace/trace_stack.c:528:43: sparse: expected void *

[linux-next:master 3942/14131] kernel/trace/trace_stack.c:528:43: sparse: expected void *

[kbuild test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   e7b08814b16b80a0bf76eeca16317f8c2ed23b8c
commit: 32927393dc1ccd60fb2bdc05b9e8e88753761469 [3942/14131] sysctl: pass kernel pointers to ->proc_handler
config: i386-randconfig-s031-20200601 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-13) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.1-243-gc100a7ab-dirty
        git checkout 32927393dc1ccd60fb2bdc05b9e8e88753761469
        # save the attached .config to linux build tree
        make W=1 C=1 ARCH=i386 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'

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


sparse warnings: (new ones prefixed by >>)

   kernel/trace/trace_stack.c:528:43: sparse: sparse: incorrect type in argument 3 (different address spaces) @@     expected void * @@     got void [noderef] <asn:1> *buffer @@
>> kernel/trace/trace_stack.c:528:43: sparse:     expected void *
>> kernel/trace/trace_stack.c:528:43: sparse:     got void [noderef] <asn:1> *buffer

vim +528 kernel/trace/trace_stack.c

bbd1d27d863d5c Steven Rostedt (VMware  2017-07-11  516) 
f38f1d2aa5a352 Steven Rostedt          2008-12-16  517  int
f38f1d2aa5a352 Steven Rostedt          2008-12-16  518  stack_trace_sysctl(struct ctl_table *table, int write,
8d65af789f3e2c Alexey Dobriyan         2009-09-23  519  		   void __user *buffer, size_t *lenp,
f38f1d2aa5a352 Steven Rostedt          2008-12-16  520  		   loff_t *ppos)
f38f1d2aa5a352 Steven Rostedt          2008-12-16  521  {
3d9a8072915366 Thomas Gleixner         2019-04-25  522  	int was_enabled;
f38f1d2aa5a352 Steven Rostedt          2008-12-16  523  	int ret;
f38f1d2aa5a352 Steven Rostedt          2008-12-16  524  
f38f1d2aa5a352 Steven Rostedt          2008-12-16  525  	mutex_lock(&stack_sysctl_mutex);
3d9a8072915366 Thomas Gleixner         2019-04-25  526  	was_enabled = !!stack_tracer_enabled;
f38f1d2aa5a352 Steven Rostedt          2008-12-16  527  
8d65af789f3e2c Alexey Dobriyan         2009-09-23 @528  	ret = proc_dointvec(table, write, buffer, lenp, ppos);
f38f1d2aa5a352 Steven Rostedt          2008-12-16  529  
3d9a8072915366 Thomas Gleixner         2019-04-25  530  	if (ret || !write || (was_enabled == !!stack_tracer_enabled))
f38f1d2aa5a352 Steven Rostedt          2008-12-16  531  		goto out;
f38f1d2aa5a352 Steven Rostedt          2008-12-16  532  
f38f1d2aa5a352 Steven Rostedt          2008-12-16  533  	if (stack_tracer_enabled)
f38f1d2aa5a352 Steven Rostedt          2008-12-16  534  		register_ftrace_function(&trace_ops);
f38f1d2aa5a352 Steven Rostedt          2008-12-16  535  	else
f38f1d2aa5a352 Steven Rostedt          2008-12-16  536  		unregister_ftrace_function(&trace_ops);
f38f1d2aa5a352 Steven Rostedt          2008-12-16  537   out:
f38f1d2aa5a352 Steven Rostedt          2008-12-16  538  	mutex_unlock(&stack_sysctl_mutex);
f38f1d2aa5a352 Steven Rostedt          2008-12-16  539  	return ret;
f38f1d2aa5a352 Steven Rostedt          2008-12-16  540  }
f38f1d2aa5a352 Steven Rostedt          2008-12-16  541  

:::::: The code at line 528 was first introduced by commit
:::::: 8d65af789f3e2cf4cfbdbf71a0f7a61ebcd41d38 sysctl: remove "struct file *" argument of ->proc_handler

:::::: TO: Alexey Dobriyan <adobriyan@gmail.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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