WARNING: line length of 88 exceeds 80 columns
#60: FILE: include/linux/page_frag_cache.h:103:
+static inline unsigned int page_frag_cache_page_offset(const struct page_frag_cache *nc)

WARNING: line length of 82 exceeds 80 columns
#71: FILE: include/linux/page_frag_cache.h:114:
+void *page_frag_alloc_va_prepare(struct page_frag_cache *nc, unsigned int *fragsz,

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#101: FILE: include/linux/page_frag_cache.h:144:
+	VM_BUG_ON(!*fragsz);

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#118: FILE: include/linux/page_frag_cache.h:161:
+	VM_BUG_ON(fragsz > nc->remaining || !nc->pagecnt_bias);

WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
#126: FILE: include/linux/page_frag_cache.h:169:
+	VM_BUG_ON(fragsz > nc->remaining);

total: 0 errors, 5 warnings, 0 checks, 220 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 20bc60eefe4c ("mm: page_frag: introduce prepare/probe/commit API") 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, 5 warnings, 0 checks, 220 lines checked