[bpf-next:master 1540/1551] kernel/bpf/stackmap.c:688:29: error: passing argument 1 of '__bpf_get_stack' from incompatible pointer type

[bpf-next:master 1540/1551] kernel/bpf/stackmap.c:688:29: error: passing argument 1 of '__bpf_get_stack' from incompatible pointer type

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
head:   5ab739372a148bb4e35296edd3a63c8b17094019
commit: 03d42fd2d83fcaa545a23e2c4a06c447d531df89 [1540/1551] bpf: Separate bpf_get_[stack|stackid] for perf events BPF
config: s390-randconfig-r022-20200724 (attached as .config)
compiler: s390-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 03d42fd2d83fcaa545a23e2c4a06c447d531df89
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=s390 

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

All errors (new ones prefixed by >>):

   kernel/bpf/stackmap.c: In function '____bpf_get_stack_pe':
>> kernel/bpf/stackmap.c:688:29: error: passing argument 1 of '__bpf_get_stack' from incompatible pointer type [-Werror=incompatible-pointer-types]
     688 |   return __bpf_get_stack(ctx->regs, NULL, NULL, buf, size, flags);
         |                          ~~~^~~~~~
         |                             |
         |                             bpf_user_pt_regs_t * {aka struct <anonymous> *}
   kernel/bpf/stackmap.c:571:45: note: expected 'struct pt_regs *' but argument is of type 'bpf_user_pt_regs_t *' {aka 'struct <anonymous> *'}
     571 | static long __bpf_get_stack(struct pt_regs *regs, struct task_struct *task,
         |                             ~~~~~~~~~~~~~~~~^~~~
   kernel/bpf/stackmap.c:708:28: error: passing argument 1 of '__bpf_get_stack' from incompatible pointer type [-Werror=incompatible-pointer-types]
     708 |   err = __bpf_get_stack(ctx->regs, NULL, trace, buf,
         |                         ~~~^~~~~~
         |                            |
         |                            bpf_user_pt_regs_t * {aka struct <anonymous> *}
   kernel/bpf/stackmap.c:571:45: note: expected 'struct pt_regs *' but argument is of type 'bpf_user_pt_regs_t *' {aka 'struct <anonymous> *'}
     571 | static long __bpf_get_stack(struct pt_regs *regs, struct task_struct *task,
         |                             ~~~~~~~~~~~~~~~~^~~~
   kernel/bpf/stackmap.c:721:28: error: passing argument 1 of '__bpf_get_stack' from incompatible pointer type [-Werror=incompatible-pointer-types]
     721 |   err = __bpf_get_stack(ctx->regs, NULL, trace, buf,
         |                         ~~~^~~~~~
         |                            |
         |                            bpf_user_pt_regs_t * {aka struct <anonymous> *}
   kernel/bpf/stackmap.c:571:45: note: expected 'struct pt_regs *' but argument is of type 'bpf_user_pt_regs_t *' {aka 'struct <anonymous> *'}
     571 | static long __bpf_get_stack(struct pt_regs *regs, struct task_struct *task,
         |                             ~~~~~~~~~~~~~~~~^~~~
   cc1: some warnings being treated as errors

vim +/__bpf_get_stack +688 kernel/bpf/stackmap.c

   677	
   678	BPF_CALL_4(bpf_get_stack_pe, struct bpf_perf_event_data_kern *, ctx,
   679		   void *, buf, u32, size, u64, flags)
   680	{
   681		struct perf_event *event = ctx->event;
   682		struct perf_callchain_entry *trace;
   683		bool kernel, user;
   684		int err = -EINVAL;
   685		__u64 nr_kernel;
   686	
   687		if (!(event->attr.sample_type & __PERF_SAMPLE_CALLCHAIN_EARLY))
 > 688			return __bpf_get_stack(ctx->regs, NULL, NULL, buf, size, flags);
   689	
   690		if (unlikely(flags & ~(BPF_F_SKIP_FIELD_MASK | BPF_F_USER_STACK |
   691				       BPF_F_USER_BUILD_ID)))
   692			goto clear;
   693	
   694		user = flags & BPF_F_USER_STACK;
   695		kernel = !user;
   696	
   697		err = -EFAULT;
   698		trace = ctx->data->callchain;
   699		if (unlikely(!trace))
   700			goto clear;
   701	
   702		nr_kernel = count_kernel_ip(trace);
   703	
   704		if (kernel) {
   705			__u64 nr = trace->nr;
   706	
   707			trace->nr = nr_kernel;
   708			err = __bpf_get_stack(ctx->regs, NULL, trace, buf,
   709					      size, flags);
   710	
   711			/* restore nr */
   712			trace->nr = nr;
   713		} else { /* user */
   714			u64 skip = flags & BPF_F_SKIP_FIELD_MASK;
   715	
   716			skip += nr_kernel;
   717			if (skip > BPF_F_SKIP_FIELD_MASK)
   718				goto clear;
   719	
   720			flags = (flags & ~BPF_F_SKIP_FIELD_MASK) | skip;
   721			err = __bpf_get_stack(ctx->regs, NULL, trace, buf,
   722					      size, flags);
   723		}
   724		return err;
   725	
   726	clear:
   727		memset(buf, 0, size);
   728		return err;
   729	

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

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