Subject: Re: [PATCH 1/2] mm: Fix struct page layout on 32-bit systems

From: kernel test robot <[email-masked]>
Date: Sat, 17 Apr 2021 09:08:41 +0800

Hi "Matthew,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linux/master]
[also build test WARNING on linus/master v5.12-rc7]
[cannot apply to hnaz-linux-mm/master next-20210416]
[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/Matthew-Wilcox-Oracle/Change-struct-page-layout-for-page_pool/20210417-070951
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 5e46d1b78a03d52306f21f77a4e4a144b6d31486
config: parisc-randconfig-s031-20210416 (attached as .config)
compiler: hppa-linux-gcc (GCC) 9.3.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.3-280-g2cd6d34e-dirty
        # https://github.com/0day-ci/linux/commit/898e155048088be20b2606575a24108eacc4c91b
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Matthew-Wilcox-Oracle/Change-struct-page-layout-for-page_pool/20210417-070951
        git checkout 898e155048088be20b2606575a24108eacc4c91b
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' W=1 ARCH=parisc 

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

All warnings (new ones prefixed by >>):

   In file included from net/core/xdp.c:15:
   include/net/page_pool.h: In function 'page_pool_get_dma_addr':
>> include/net/page_pool.h:203:40: warning: left shift count >= width of type [-Wshift-count-overflow]
     203 |   ret |= (dma_addr_t)page->dma_addr[1] << 32;
         |                                        ^~
   include/net/page_pool.h: In function 'page_pool_set_dma_addr':
>> include/net/page_pool.h:211:28: warning: right shift count >= width of type [-Wshift-count-overflow]
     211 |   page->dma_addr[1] = addr >> 32;
         |                            ^~

vim +203 include/net/page_pool.h

   198	
   199	static inline dma_addr_t page_pool_get_dma_addr(struct page *page)
   200	{
   201		dma_addr_t ret = page->dma_addr[0];
   202		if (sizeof(dma_addr_t) > sizeof(unsigned long))
 > 203			ret |= (dma_addr_t)page->dma_addr[1] << 32;
   204		return ret;
   205	}
   206	
   207	static inline void page_pool_set_dma_addr(struct page *page, dma_addr_t addr)
   208	{
   209		page->dma_addr[0] = addr;
   210		if (sizeof(dma_addr_t) > sizeof(unsigned long))
 > 211			page->dma_addr[1] = addr >> 32;
   212	}
   213	

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0-DAY CI Kernel Test Service, Intel Corporation
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