CHECK: Prefer using the BIT macro
#40: FILE: include/net/dst_cache.h:13:
+#define DST_CACHE_INPUT_SIZE (1 << DST_CACHE_INPUT_SHIFT)

CHECK: Macro argument 'head' may be better as '(head)' to avoid precedence issues
#58: FILE: include/net/dst_cache.h:31:
+#define idst_for_each_in_bucket(pos, head, hash)		\
+	for (pos = &head[hash];					\
+	     pos < &head[hash + DST_CACHE_INPUT_BUCKET_SIZE];	\
+	     pos++)

WARNING: line length of 81 exceeds 80 columns
#157: FILE: net/core/dst_cache.c:200:
+static struct dst_entry *__dst_cache_input_get_noref(struct dst_cache_pcpu *idst)

WARNING: line length of 122 exceeds 80 columns
#217: FILE: net/core/dst_cache.c:260:
+	dst_cache->cache = (struct dst_cache_pcpu __percpu *)alloc_percpu_gfp(struct dst_cache_pcpu[DST_CACHE_INPUT_SIZE],

WARNING: line length of 103 exceeds 80 columns
#218: FILE: net/core/dst_cache.c:261:
+									      GFP_KERNEL | __GFP_ZERO);

total: 0 errors, 3 warnings, 2 checks, 234 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 418cef605f6d ("net: dst_cache: add input_dst_cache 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, 3 warnings, 2 checks, 234 lines checked