netdev - Re: [PATCH] net: neterion: vxge: reduce stack usage in VXGE_COMPLETE_VPATH

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Date:   Thu, 16 Jul 2020 22:11:31 +0800
From:   kernel test robot <lkp@...el.com>
To:     Bixuan Cui <cuibixuan@...wei.com>, davem@...emloft.net,
        kuba@...nel.org, linux-next@...r.kernel.org
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, jdmason@...zu.us,
        christophe.jaillet@...adoo.fr, john.wanghui@...wei.com
Subject: Re: [PATCH] net: neterion: vxge: reduce stack usage in
 VXGE_COMPLETE_VPATH_TX

Hi Bixuan,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on sparc-next/master]
[also build test ERROR on net-next/master net/master linus/master v5.8-rc5 next-20200716]
[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/Bixuan-Cui/net-neterion-vxge-reduce-stack-usage-in-VXGE_COMPLETE_VPATH_TX/20200716-173219
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next.git master
config: arc-allyesconfig (attached as .config)
compiler: arc-elf-gcc (GCC) 9.3.0
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
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arc 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   drivers/net/ethernet/neterion/vxge/vxge-main.c: In function 'VXGE_COMPLETE_VPATH_TX':
>> drivers/net/ethernet/neterion/vxge/vxge-main.c:103:19: error: conflicting types for 'completed'
     103 |  struct sk_buff **completed;
         |                   ^~~~~~~~~
   drivers/net/ethernet/neterion/vxge/vxge-main.c:102:18: note: previous declaration of 'completed' was here
     102 |  struct sk_buff *completed[NR_SKB_COMPLETED];
         |                  ^~~~~~~~~
>> drivers/net/ethernet/neterion/vxge/vxge-main.c:126:2: error: implicit declaration of function 'free' [-Werror=implicit-function-declaration]
     126 |  free(completed);
         |  ^~~~
   drivers/net/ethernet/neterion/vxge/vxge-main.c:60:1: note: 'free' is defined in header '<stdlib.h>'; did you forget to '#include <stdlib.h>'?
      59 | #include "vxge-main.h"
     +++ |+#include <stdlib.h>
      60 | #include "vxge-reg.h"
   cc1: some warnings being treated as errors

vim +/completed +103 drivers/net/ethernet/neterion/vxge/vxge-main.c

    96	
    97	static inline void VXGE_COMPLETE_VPATH_TX(struct vxge_fifo *fifo)
    98	{
    99		struct sk_buff **skb_ptr = NULL;
   100		struct sk_buff **temp;
   101	#define NR_SKB_COMPLETED 128
   102		struct sk_buff *completed[NR_SKB_COMPLETED];
 > 103		struct sk_buff **completed;
   104		int more;
   105	
   106		completed = kcalloc(NR_SKB_COMPLETED, sizeof(*completed),
   107				    GFP_KERNEL);
   108		if (!completed)
   109			return;
   110	
   111		do {
   112			more = 0;
   113			skb_ptr = completed;
   114	
   115			if (__netif_tx_trylock(fifo->txq)) {
   116				vxge_hw_vpath_poll_tx(fifo->handle, &skb_ptr,
   117							NR_SKB_COMPLETED, &more);
   118				__netif_tx_unlock(fifo->txq);
   119			}
   120	
   121			/* free SKBs */
   122			for (temp = completed; temp != skb_ptr; temp++)
   123				dev_consume_skb_irq(*temp);
   124		} while (more);
   125	
 > 126		free(completed);
   127	}
   128	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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