CHECK: extern prototypes should be avoided in .h files
#57: FILE: include/linux/sched/isolation.h:43:
+extern int housekeeping_update(struct cpumask *isol_mask, enum hk_type type);

WARNING: line length of 97 exceeds 80 columns
#65: FILE: include/linux/sched/isolation.h:71:
+static inline int housekeeping_update(struct cpumask *isol_mask, enum hk_type type) { return 0; }

WARNING: line length of 88 exceeds 80 columns
#103: FILE: kernel/sched/isolation.c:43:
+		/* CPU hotplug write locked, so cpuset partition can't be overwritten */

WARNING: line length of 83 exceeds 80 columns
#104: FILE: kernel/sched/isolation.c:44:
+		if (IS_ENABLED(CONFIG_HOTPLUG_CPU) && lockdep_is_cpus_write_held())

WARNING: line length of 81 exceeds 80 columns
#117: FILE: kernel/sched/isolation.c:57:
+static inline struct cpumask *housekeeping_cpumask_dereference(enum hk_type type)

WARNING: ENOTSUPP is not a SUSV4 error code, prefer EOPNOTSUPP
#158: FILE: kernel/sched/isolation.c:125:
+		return -ENOTSUPP;

WARNING: line length of 84 exceeds 80 columns
#164: FILE: kernel/sched/isolation.c:131:
+	cpumask_andnot(trial, housekeeping_cpumask(HK_TYPE_DOMAIN_BOOT), isol_mask);

total: 0 errors, 6 warnings, 1 checks, 141 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 26e7e63c7c0c ("cpuset: Update HK_TYPE_DOMAIN cpumask from cpuset") 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, 6 warnings, 1 checks, 141 lines checked