linux-kernel - Re: [Intel-gfx] [PATCH v6] drm/i915: Use __sg_alloc_table_from

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Date:   Fri, 13 Jan 2017 02:20:21 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Tvrtko Ursulin <tursulin@...ulin.net>
Cc:     kbuild-all@...org, Intel-gfx@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [Intel-gfx] [PATCH v6] drm/i915: Use __sg_alloc_table_from_pages
 for userptr allocations

Hi Tvrtko,

[auto build test ERROR on drm-intel/for-linux-next]
[also build test ERROR on next-20170111]
[cannot apply to v4.10-rc3]
[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/Tvrtko-Ursulin/drm-i915-Use-__sg_alloc_table_from_pages-for-userptr-allocations/20170113-004619
base:   git://anongit.freedesktop.org/drm-intel for-linux-next
config: x86_64-rhel (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   In file included from drivers/gpu/drm/i915/i915_drv.c:48:0:
   drivers/gpu/drm/i915/i915_drv.h: In function 'i915_sg_segment_size':
>> drivers/gpu/drm/i915/i915_drv.h:2605:10: error: 'SCATTERLIST_MAX_SEGMENT' undeclared (first use in this function)
      return SCATTERLIST_MAX_SEGMENT;
             ^~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/i915/i915_drv.h:2605:10: note: each undeclared identifier is reported only once for each function it appears in
--
   In file included from drivers/gpu/drm/i915/i915_gem_userptr.c:27:0:
   drivers/gpu/drm/i915/i915_drv.h: In function 'i915_sg_segment_size':
>> drivers/gpu/drm/i915/i915_drv.h:2605:10: error: 'SCATTERLIST_MAX_SEGMENT' undeclared (first use in this function)
      return SCATTERLIST_MAX_SEGMENT;
             ^~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/i915/i915_drv.h:2605:10: note: each undeclared identifier is reported only once for each function it appears in
   drivers/gpu/drm/i915/i915_gem_userptr.c: In function '__i915_gem_userptr_alloc_pages':
>> drivers/gpu/drm/i915/i915_gem_userptr.c:406:8: error: implicit declaration of function '__sg_alloc_table_from_pages' [-Werror=implicit-function-declaration]
     ret = __sg_alloc_table_from_pages(st, pvec, num_pages,
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/SCATTERLIST_MAX_SEGMENT +2605 drivers/gpu/drm/i915/i915_drv.h

  2599	
  2600	static inline unsigned int i915_sg_segment_size(void)
  2601	{
  2602		unsigned int size = swiotlb_max_segment();
  2603	
  2604		if (size == 0)
> 2605			return SCATTERLIST_MAX_SEGMENT;
  2606	
  2607		size = rounddown(size, PAGE_SIZE);
  2608		/* swiotlb_max_segment_size can return 1 byte when it means one page. */

---
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