WARNING: line length of 85 exceeds 80 columns
#41: FILE: include/linux/page_frag_cache.h:71:
+					    struct page_frag *pfrag, bool referenced,

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
#47: FILE: include/linux/page_frag_cache.h:77:
+		VM_BUG_ON(!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
#51: FILE: include/linux/page_frag_cache.h:81:
+	VM_BUG_ON(used_sz > pfrag->size);

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
#52: FILE: include/linux/page_frag_cache.h:82:
+	VM_BUG_ON(pfrag->page != page_frag_encoded_page_ptr(nc->encoded_page));

WARNING: line length of 93 exceeds 80 columns
#53: FILE: include/linux/page_frag_cache.h:83:
+	VM_BUG_ON(pfrag->offset + pfrag->size > page_frag_cache_page_size(nc->encoded_page));

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
#53: FILE: include/linux/page_frag_cache.h:83:
+	VM_BUG_ON(pfrag->offset + pfrag->size > page_frag_cache_page_size(nc->encoded_page));

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
#56: FILE: include/linux/page_frag_cache.h:86:
+	VM_BUG_ON(nc->offset > pfrag->offset);

WARNING: line length of 82 exceeds 80 columns
#60: FILE: include/linux/page_frag_cache.h:90:
+	/* Return the true size back to caller considering the offset alignment */

WARNING: line length of 92 exceeds 80 columns
#66: FILE: include/linux/page_frag_cache.h:96:
+static inline void *__page_frag_alloc_align(struct page_frag_cache *nc, unsigned int fragsz,

WARNING: line length of 84 exceeds 80 columns
#67: FILE: include/linux/page_frag_cache.h:97:
+					    gfp_t gfp_mask, unsigned int align_mask)

WARNING: line length of 85 exceeds 80 columns
#72: FILE: include/linux/page_frag_cache.h:102:
+	va = __page_frag_cache_prepare(nc, fragsz, &page_frag, gfp_mask, align_mask);

total: 0 errors, 11 warnings, 0 checks, 115 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 309b1d973624 ("mm: page_frag: some minor refactoring before adding new 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, 11 warnings, 0 checks, 115 lines checked