WARNING: line length of 83 exceeds 80 columns
#52: FILE: kernel/bpf/stackmap.c:249:
+bpf_get_perf_callchain(struct pt_regs *regs, bool kernel, bool user, int max_stack,

WARNING: line length of 94 exceeds 80 columns
#65: FILE: kernel/bpf/stackmap.c:262:
+	ret = __get_perf_callchain(entry, regs, kernel, user, max_stack, crosstask, false, 0);

WARNING: line length of 89 exceeds 80 columns
#115: FILE: kernel/bpf/stackmap.c:502:
+		trace = bpf_get_perf_callchain(regs, kernel, user, max_depth, crosstask);

total: 0 errors, 3 warnings, 0 checks, 107 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 4ab31a48c069 ("bpf: Hold ther perf callchain entry until used completely") has style problems, please review.

NOTE: Ignored message types: ALLOC_SIZEOF_STRUCT BAD_REPORTED_BY_LINK CAMELCASE COMMIT_LOG_LONG_LINE FILE_PATH_CHANGES 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, 3 warnings, 0 checks, 107 lines checked