WARNING: Non-declarative macros with multiple statements should be enclosed in a do - while loop
#207: FILE: include/net/libeth/xdp.h:78:
+#define ___LIBETH_XDP_ONSTACK_BUFF(name, ...)				      \
+	__DEFINE_FLEX(struct libeth_xdp_buff, name, priv,		      \
+		      LIBETH_XDP_PRIV_SZ(__VA_ARGS__ + 0),		      \
+		      __uninitialized);					      \
+	LIBETH_XDP_ASSERT_PRIV_SZ(__VA_ARGS__ + 0)

BUT SEE:

   do {} while (0) advice is over-stated in a few situations:

   The more obvious case is macros, like MODULE_PARM_DESC, invoked at
   file-scope, where C disallows code (it must be in functions).  See
   $exceptions if you have one to add by name.

   More troublesome is declarative macros used at top of new scope,
   like DECLARE_PER_CPU.  These might just compile with a do-while-0
   wrapper, but would be incorrect.  Most of these are handled by
   detecting struct,union,etc declaration primitives in $exceptions.

   Theres also macros called inside an if (block), which "return" an
   expression.  These cannot do-while, and need a ({}) wrapper.

   Enjoy this qualification while we work to improve our heuristics.

total: 0 errors, 1 warnings, 0 checks, 298 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 7dc5beedeaa2 ("libeth: xdp: add helpers for preparing/processing &libeth_xdp_buff") 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, 1 warnings, 0 checks, 298 lines checked