Subject: Re: [PATCH v4] Add payload to be 32-bit aligned to fix dropped packets

From: kernel test robot <[email-masked]>
Date: Mon, 15 Nov 2021 13:28:53 +0800

Hi Kumar,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v5.16-rc1 next-20211115]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Kumar-Thangavel/Add-payload-to-be-32-bit-aligned-to-fix-dropped-packets/20211110-175537
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git cb690f5238d71f543f4ce874aa59237cf53a877c
config: riscv-buildonly-randconfig-r006-20211115 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project fbe72e41b99dc7994daac300d208a955be3e4a0a)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # https://github.com/0day-ci/linux/commit/263eaf647698f405f4f9905c947bf73b87c55b79
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Kumar-Thangavel/Add-payload-to-be-32-bit-aligned-to-fix-dropped-packets/20211110-175537
        git checkout 263eaf647698f405f4f9905c947bf73b87c55b79
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=riscv 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <[email-masked]>

All warnings (new ones prefixed by >>):

>> net/ncsi/ncsi-cmd.c:225:9: warning: comparison of distinct pointer types ('typeof (payload) *' (aka 'unsigned short *') and 'typeof (26) *' (aka 'int *')) [-Wcompare-distinct-pointer-types]
           len += max(payload, 26);
                  ^~~~~~~~~~~~~~~~
   include/linux/minmax.h:52:19: note: expanded from macro 'max'
   #define max(x, y)       __careful_cmp(x, y, >)
                           ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:36:24: note: expanded from macro '__careful_cmp'
           __builtin_choose_expr(__safe_cmp(x, y), \
                                 ^~~~~~~~~~~~~~~~
   include/linux/minmax.h:26:4: note: expanded from macro '__safe_cmp'
                   (__typecheck(x, y) && __no_side_effects(x, y))
                    ^~~~~~~~~~~~~~~~~
   include/linux/minmax.h:20:28: note: expanded from macro '__typecheck'
           (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
                      ~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~
   1 warning generated.

vim +225 net/ncsi/ncsi-cmd.c

   210	
   211	static int ncsi_cmd_handler_oem(struct sk_buff *skb,
   212					struct ncsi_cmd_arg *nca)
   213	{
   214		struct ncsi_cmd_oem_pkt *cmd;
   215		unsigned int len;
   216		/* NC-SI spec DSP_0222_1.2.0, section 8.2.2.2
   217		 * requires payload to be padded with 0 to
   218		 * 32-bit boundary before the checksum field.
   219		 * Ensure the padding bytes are accounted for in
   220		 * skb allocation
   221		 */
   222	
   223		unsigned short payload = ALIGN(nca->payload, 4);
   224		len = sizeof(struct ncsi_cmd_pkt_hdr) + 4;
 > 225		len += max(payload, 26);
   226	
   227		cmd = skb_put_zero(skb, len);
   228		memcpy(&cmd->mfr_id, nca->data, nca->payload);
   229		ncsi_cmd_build_header(&cmd->cmd.common, nca);
   230	
   231		return 0;
   232	}
   233	

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