Re: [PATCH 12/31] net/tcp: Add tcp_parse_auth_options()

[kernel test robot]

Hi Dmitry,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on e34cfee65ec891a319ce79797dda18083af33a76]

url:    https://github.com/intel-lab-lkp/linux/commits/Dmitry-Safonov/net-tcp-Add-TCP-AO-support/20220819-010628
base:   e34cfee65ec891a319ce79797dda18083af33a76
config: um-i386_defconfig (https://download.01.org/0day-ci/archive/20220819/202208190256.Kj0PqjuN-lkp@xxxxxxxxx/config)
compiler: gcc-11 (Debian 11.3.0-5) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/c206ead11e78dec4ec0058427d494521f9d53c3f
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Dmitry-Safonov/net-tcp-Add-TCP-AO-support/20220819-010628
        git checkout c206ead11e78dec4ec0058427d494521f9d53c3f
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=um SUBARCH=i386 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

>> net/ipv4/tcp_ipv4.c:665:7: warning: "CONFIG_TCP_MD5SIG" is not defined, evaluates to 0 [-Wundef]
     665 | #elif CONFIG_TCP_MD5SIG
         |       ^~~~~~~~~~~~~~~~~


vim +/CONFIG_TCP_MD5SIG +665 net/ipv4/tcp_ipv4.c

   649	
   650	/*
   651	 *	This routine will send an RST to the other tcp.
   652	 *
   653	 *	Someone asks: why I NEVER use socket parameters (TOS, TTL etc.)
   654	 *		      for reset.
   655	 *	Answer: if a packet caused RST, it is not for a socket
   656	 *		existing in our system, if it is matched to a socket,
   657	 *		it is just duplicate segment or bug in other side's TCP.
   658	 *		So that we build reply only basing on parameters
   659	 *		arrived with segment.
   660	 *	Exception: precedence violation. We do not implement it in any case.
   661	 */
   662	
   663	#ifdef CONFIG_TCP_AO
   664	#define OPTION_BYTES MAX_TCP_OPTION_SPACE
 > 665	#elif CONFIG_TCP_MD5SIG
   666	#define OPTION_BYTES TCPOLEN_MD5SIG_ALIGNED
   667	#else
   668	#define OPTION_BYTES sizeof(__be32)
   669	#endif
   670	

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