CHECK: extern prototypes should be avoided in .h files
#35: FILE: include/linux/percpu.h:144:
+extern bool pcpu_charge(void __percpu *__pdata, size_t size, gfp_t gfp);

CHECK: extern prototypes should be avoided in .h files
#36: FILE: include/linux/percpu.h:145:
+extern void pcpu_uncharge(void __percpu *__pdata, size_t size);

CHECK: Please use a blank line after function/struct/union/enum declarations
#42: FILE: include/linux/percpu.h:151:
+}
+static inline void pcpu_uncharge(void __percpu *__pdata, size_t size) { }

WARNING: line length of 84 exceeds 80 columns
#65: FILE: mm/percpu.c:1619:
+static void pcpu_alloc_tag_free_hook(struct pcpu_chunk *chunk, int off, size_t size)

WARNING: line length of 87 exceeds 80 columns
#68: FILE: mm/percpu.c:1622:
+		alloc_tag_sub(&chunk->obj_exts[off >> PCPU_MIN_ALLOC_SHIFT].tag, size);

WARNING: line length of 84 exceeds 80 columns
#76: FILE: mm/percpu.c:1630:
+static void pcpu_alloc_tag_free_hook(struct pcpu_chunk *chunk, int off, size_t size)

CHECK: Please use a blank line after function/struct/union/enum declarations
#88: FILE: mm/percpu.c:1696:
 }
+bool pcpu_charge(void *ptr, size_t size, gfp_t gfp)

total: 0 errors, 3 warnings, 4 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 b05db7dd0d61 ("mm/percpu: allow (un)charging objects without alloc/free") 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, 4 checks, 114 lines checked