linux-kernel - Re: [PATCH] amd-xgbe: use PAGE_ALLOC_COSTLY_ORDER in xgbe_map_rx

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Date:   Sat, 3 Jun 2017 09:25:48 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     kbuild-all@...org, Tom Lendacky <thomas.lendacky@....com>,
        linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] amd-xgbe: use PAGE_ALLOC_COSTLY_ORDER in
 xgbe_map_rx_buffer

Hi Michal,

[auto build test WARNING on net-next/master]
[also build test WARNING on v4.12-rc3 next-20170602]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Michal-Hocko/amd-xgbe-use-PAGE_ALLOC_COSTLY_ORDER-in-xgbe_map_rx_buffer/20170603-021038
config: x86_64-randconfig-v0-06030836 (attached as .config)
compiler: gcc-4.4 (Debian 4.4.7-8) 4.4.7
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   drivers/net//ethernet/amd/xgbe/xgbe-desc.c: In function 'xgbe_map_rx_buffer':
>> drivers/net//ethernet/amd/xgbe/xgbe-desc.c:327: warning: unused variable 'order'

vim +/order +327 drivers/net//ethernet/amd/xgbe/xgbe-desc.c

174fd259 Lendacky, Thomas 2014-11-04  311  	if ((pa->pages_offset + len) > pa->pages_len) {
08dcc47c Lendacky, Thomas 2014-11-04  312  		/* This data descriptor is responsible for unmapping page(s) */
174fd259 Lendacky, Thomas 2014-11-04  313  		bd->pa_unmap = *pa;
08dcc47c Lendacky, Thomas 2014-11-04  314  
08dcc47c Lendacky, Thomas 2014-11-04  315  		/* Get a new allocation next time */
174fd259 Lendacky, Thomas 2014-11-04  316  		pa->pages = NULL;
174fd259 Lendacky, Thomas 2014-11-04  317  		pa->pages_len = 0;
174fd259 Lendacky, Thomas 2014-11-04  318  		pa->pages_offset = 0;
174fd259 Lendacky, Thomas 2014-11-04  319  		pa->pages_dma = 0;
174fd259 Lendacky, Thomas 2014-11-04  320  	}
174fd259 Lendacky, Thomas 2014-11-04  321  }
174fd259 Lendacky, Thomas 2014-11-04  322  
174fd259 Lendacky, Thomas 2014-11-04  323  static int xgbe_map_rx_buffer(struct xgbe_prv_data *pdata,
174fd259 Lendacky, Thomas 2014-11-04  324  			      struct xgbe_ring *ring,
174fd259 Lendacky, Thomas 2014-11-04  325  			      struct xgbe_ring_data *rdata)
174fd259 Lendacky, Thomas 2014-11-04  326  {
174fd259 Lendacky, Thomas 2014-11-04 @327  	int order, ret;
174fd259 Lendacky, Thomas 2014-11-04  328  
174fd259 Lendacky, Thomas 2014-11-04  329  	if (!ring->rx_hdr_pa.pages) {
174fd259 Lendacky, Thomas 2014-11-04  330  		ret = xgbe_alloc_pages(pdata, &ring->rx_hdr_pa, GFP_ATOMIC, 0);
174fd259 Lendacky, Thomas 2014-11-04  331  		if (ret)
174fd259 Lendacky, Thomas 2014-11-04  332  			return ret;
08dcc47c Lendacky, Thomas 2014-11-04  333  	}
08dcc47c Lendacky, Thomas 2014-11-04  334  
174fd259 Lendacky, Thomas 2014-11-04  335  	if (!ring->rx_buf_pa.pages) {

:::::: The code at line 327 was first introduced by commit
:::::: 174fd2597b0bd8c19fce6a97e8b0f753ef4ce7cb amd-xgbe: Implement split header receive support

:::::: TO: Lendacky, Thomas <Thomas.Lendacky@....com>
:::::: CC: David S. Miller <davem@...emloft.net>

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