Hi Alexei,

I love your patch! Yet something to improve:

[auto build test ERROR on net-next/master]
[also build test ERROR on v5.7-rc7 next-20200529]
[cannot apply to bpf-next/master bpf/master net/master]
[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/Alexei-Starovoitov/bpf-Introduce-minimal-support-for-sleepable-progs/20200531-055259
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git bc183dec08f9cb177cf5206a010b7a9e7b22e567
config: microblaze-randconfig-c003-20200531 (attached as .config)
compiler: microblaze-linux-gcc (GCC) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <redacted>

All errors (new ones prefixed by >>, old ones prefixed by <<):

microblaze-linux-ld: kernel/bpf/syscall.o: in function `__bpf_prog_put_noref':
kernel/bpf/syscall.c:1729: undefined reference to `bpf_srcu'
microblaze-linux-ld: kernel/bpf/hashtab.o: in function `lock_is_held':

quoted

include/linux/lockdep.h:406: undefined reference to `bpf_srcu'

microblaze-linux-ld: kernel/bpf/hashtab.o: in function `htab_map_free':
kernel/bpf/hashtab.c:1305: undefined reference to `bpf_srcu'
microblaze-linux-ld: kernel/bpf/hashtab.o: in function `lock_is_held':

quoted

include/linux/lockdep.h:406: undefined reference to `bpf_srcu'
microblaze-linux-ld: include/linux/lockdep.h:406: undefined reference to `bpf_srcu'

microblaze-linux-ld: kernel/bpf/hashtab.o:include/linux/lockdep.h:406: more undefined references to `bpf_srcu' follow

vim +406 include/linux/lockdep.h

f8319483f57f1c Peter Zijlstra 2016-11-30  403  
08f36ff642342f Matthew Wilcox 2018-01-17  404  static inline int lock_is_held(const struct lockdep_map *lock)
f8319483f57f1c Peter Zijlstra 2016-11-30  405  {
f8319483f57f1c Peter Zijlstra 2016-11-30 @406  	return lock_is_held_type(lock, -1);
f8319483f57f1c Peter Zijlstra 2016-11-30  407  }
f607c668577481 Peter Zijlstra 2009-07-20  408  

:::::: The code at line 406 was first introduced by commit
:::::: f8319483f57f1ca22370f4150bb990aca7728a67 locking/lockdep: Provide a type check for lock_is_held

:::::: TO: Peter Zijlstra [off-list ref]
:::::: CC: Dave Chinner [off-list ref]

---
0-DAY CI Kernel Test Service, Intel Corporation
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