WARNING: 'compatability' may be misspelled - perhaps 'compatibility'?
#22: 
compatability since before commit [2], __sync_fetch_and_add(...) generates
^^^^^^^^^^^^^

CHECK: Lines should not end with a '('
#94: FILE: tools/testing/selftests/bpf/progs/arena_atomics.c:91:
+	asm volatile(

CHECK: Lines should not end with a '('
#102: FILE: tools/testing/selftests/bpf/progs/arena_atomics.c:99:
+	asm volatile(

CHECK: Lines should not end with a '('
#120: FILE: tools/testing/selftests/bpf/progs/arena_atomics.c:122:
+	asm volatile(

CHECK: Lines should not end with a '('
#128: FILE: tools/testing/selftests/bpf/progs/arena_atomics.c:130:
+	asm volatile(

CHECK: Lines should not end with a '('
#146: FILE: tools/testing/selftests/bpf/progs/arena_atomics.c:153:
+	asm volatile(

CHECK: Lines should not end with a '('
#154: FILE: tools/testing/selftests/bpf/progs/arena_atomics.c:161:
+	asm volatile(

total: 0 errors, 1 warnings, 6 checks, 81 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Commit fc7d4e9e1153 ("selftests/bpf: Fix arena_atomics selftest failure due to llvm change") has style problems, please review.

NOTE: Ignored message types: ALLOC_SIZEOF_STRUCT BAD_REPORTED_BY_LINK CAMELCASE COMMIT_LOG_LONG_LINE GIT_COMMIT_ID MACRO_ARG_REUSE NO_AUTHOR_SIGN_OFF

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.
total: 0 errors, 1 warnings, 6 checks, 81 lines checked