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Subject: |WARNING| pw156805 [PATCH] net/tap: fix build with LTO
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Date: Mon, 22 Sep 2025 09:29:26 +0200 (CEST)
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Test-Label: checkpatch
Test-Status: WARNING
http://dpdk.org/patch/156805

_coding style issues_


ERROR:COMPLEX_MACRO: Macros with complex values should be enclosed in parentheses
#403: FILE: drivers/net/tap/tap_netlink.h:26:
+#define NLMSG_TAIL(msg) (void *)((char *)(msg) + NLMSG_ALIGN((msg)->nh.nlmsg_len))

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.

CHECK:MACRO_ARG_REUSE: Macro argument reuse 'msg' - possible side-effects?
#403: FILE: drivers/net/tap/tap_netlink.h:26:
+#define NLMSG_TAIL(msg) (void *)((char *)(msg) + NLMSG_ALIGN((msg)->nh.nlmsg_len))

total: 1 errors, 0 warnings, 1 checks, 319 lines checked