WARNING: line length of 87 exceeds 80 columns
#34: FILE: kernel/bpf/verifier.c:20164:
+			 * u64 bpf_get_branch_snapshot(void *buf, u32 size, u64 flags);

WARNING: line length of 102 exceeds 80 columns
#35: FILE: kernel/bpf/verifier.c:20165:
+			 * int perf_snapshot_branch_stack(struct perf_branch_entry *entries, u32 cnt);

WARNING: line length of 83 exceeds 80 columns
#37: FILE: kernel/bpf/verifier.c:20167:
+			const u32 br_entry_size = sizeof(struct perf_branch_entry);

WARNING: line length of 91 exceeds 80 columns
#48: FILE: kernel/bpf/verifier.c:20178:
+			/* Transform size (bytes) into number of entries (cnt = size / 24).

WARNING: line length of 84 exceeds 80 columns
#49: FILE: kernel/bpf/verifier.c:20179:
+			 * But to avoid expensive division instruction, we implement

WARNING: line length of 82 exceeds 80 columns
#50: FILE: kernel/bpf/verifier.c:20180:
+			 * divide-by-3 through multiplication, followed by further

WARNING: line length of 93 exceeds 80 columns
#52: FILE: kernel/bpf/verifier.c:20182:
+			 * Refer to book "Hacker's Delight, 2nd ed." by Henry S. Warren, Jr.,

WARNING: line length of 90 exceeds 80 columns
#53: FILE: kernel/bpf/verifier.c:20183:
+			 * p. 227, chapter "Unsigned Divison by 3" for details and proofs.

WARNING: line length of 89 exceeds 80 columns
#55: FILE: kernel/bpf/verifier.c:20185:
+			 * N / 3 <=> M * N / 2^33, where M = (2^33 + 1) / 3 = 0xaaaaaaab.

WARNING: line length of 99 exceeds 80 columns
#62: FILE: kernel/bpf/verifier.c:20192:
+			insn_buf[4] = BPF_EMIT_CALL(static_call_query(perf_snapshot_branch_stack));

WARNING: line length of 81 exceeds 80 columns
#65: FILE: kernel/bpf/verifier.c:20195:
+			/* return entry_cnt * sizeof(struct perf_branch_entry) */

WARNING: line length of 87 exceeds 80 columns
#66: FILE: kernel/bpf/verifier.c:20196:
+			insn_buf[6] = BPF_ALU32_IMM(BPF_MUL, BPF_REG_0, br_entry_size);

WARNING: line length of 86 exceeds 80 columns
#75: FILE: kernel/bpf/verifier.c:20205:
+			new_prog = bpf_patch_insn_data(env, i + delta, insn_buf, cnt);

CHECK: multiple assignments should be avoided
#80: FILE: kernel/bpf/verifier.c:20210:
+			env->prog = prog = new_prog;

total: 0 errors, 13 warnings, 1 checks, 61 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 a247d52eef87 ("bpf: inline bpf_get_branch_snapshot() helper") 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, 13 warnings, 1 checks, 61 lines checked