WARNING: line length of 84 exceeds 80 columns
#41: FILE: include/uapi/linux/bpf.h:5524:
+ *		Exchange kptr at pointer *dst* with *ptr*, and return the old value.

WARNING: line length of 82 exceeds 80 columns
#42: FILE: include/uapi/linux/bpf.h:5525:
+ *		*dst* can be map value or local kptr. *ptr* can be NULL, otherwise

WARNING: line length of 87 exceeds 80 columns
#43: FILE: include/uapi/linux/bpf.h:5526:
+ *		it must be a referenced pointer which will be released when this helper

WARNING: line length of 96 exceeds 80 columns
#83: FILE: kernel/bpf/verifier.c:7816:
+			verbose(env, "map '%s' has to have BTF in order to use bpf_kptr_xchg\n",

WARNING: line length of 82 exceeds 80 columns
#136: FILE: kernel/bpf/verifier.c:8487:
+	/* Local kptr types are allowed as the source argument of bpf_kptr_xchg */

WARNING: line length of 95 exceeds 80 columns
#137: FILE: kernel/bpf/verifier.c:8488:
+	if (meta->func_id == BPF_FUNC_kptr_xchg && type_is_alloc(type) && regno == BPF_REG_2) {

total: 0 errors, 6 warnings, 0 checks, 114 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 15b12ada2c09 ("bpf: Support bpf_kptr_xchg into local kptr") 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, 6 warnings, 0 checks, 114 lines checked