CHECK: multiple assignments should be avoided
#116: FILE: kernel/bpf/arena.c:455:
+		ret = pgoff = range_tree_find(&arena->rt, page_cnt);

WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
#142: 
new file mode 100644

WARNING: line length of 90 exceeds 80 columns
#299: FILE: kernel/bpf/range_tree.c:153:
+			new_rn = bpf_mem_alloc(&bpf_global_ma, sizeof(struct range_node));

WARNING: else is not generally useful after a break or return
#316: FILE: kernel/bpf/range_tree.c:170:
+			break;
+		} else {

total: 0 errors, 3 warnings, 1 checks, 384 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 efabe3fc6df5 ("bpf: Introduce range_tree data structure and use it in bpf arena") 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, 3 warnings, 1 checks, 384 lines checked