[linux-next:master 5267/5396] drivers/gpu/drm/i915/gem/i915_gem_object.h:39:6: error: shift count >= width of type

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   f6b46ef27317b3441138b902689bd89e4f82c6f4
commit: 55b24f9ce03ee4d6a06b874350c8297ac8135bf5 [5267/5396] mm/early_ioremap: add prototype for early_memremap_pgprot_adjust
config: x86_64-randconfig-a012-20210526 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 99155e913e9bad5f7f8a247f8bb3a3ff3da74af1)
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 x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=55b24f9ce03ee4d6a06b874350c8297ac8135bf5
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout 55b24f9ce03ee4d6a06b874350c8297ac8135bf5
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

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

All errors (new ones prefixed by >>):

   In file included from drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c:7:
   In file included from include/linux/dma-buf.h:16:
   In file included from include/linux/dma-buf-map.h:9:
   In file included from include/linux/io.h:13:
   In file included from arch/x86/include/asm/io.h:44:
   In file included from ./arch/x86/include/generated/asm/early_ioremap.h:1:
   In file included from include/asm-generic/early_ioremap.h:6:
   arch/x86/include/asm/fixmap.h:103:48: error: use of undeclared identifier 'NR_CPUS'
           FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_MAX_IDX * NR_CPUS) - 1,
                                                         ^
   In file included from drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c:11:
   In file included from drivers/gpu/drm/i915/i915_drv.h:83:
   In file included from drivers/gpu/drm/i915/gt/intel_gt_types.h:18:
   In file included from drivers/gpu/drm/i915/gt/uc/intel_uc.h:9:
   In file included from drivers/gpu/drm/i915/gt/uc/intel_guc.h:17:
   In file included from drivers/gpu/drm/i915/i915_vma.h:34:

quoted

drivers/gpu/drm/i915/gem/i915_gem_object.h:39:6: error: shift count >= width of type [-Werror,-Wshift-count-overflow]

           if (overflows_type(size, obj->base.size))
           ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/i915/i915_utils.h:125:32: note: expanded from macro 'overflows_type'
           (sizeof(x) > sizeof(T) && (x) >> BITS_PER_TYPE(T))
                                         ^
   include/linux/compiler.h:56:47: note: expanded from macro 'if'
   #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
                              ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/compiler.h:58:52: note: expanded from macro '__trace_if_var'
   #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
                                                      ^~~~
   In file included from drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c:11:
   In file included from drivers/gpu/drm/i915/i915_drv.h:83:
   In file included from drivers/gpu/drm/i915/gt/intel_gt_types.h:18:
   In file included from drivers/gpu/drm/i915/gt/uc/intel_uc.h:9:
   In file included from drivers/gpu/drm/i915/gt/uc/intel_guc.h:17:
   In file included from drivers/gpu/drm/i915/i915_vma.h:34:

quoted

drivers/gpu/drm/i915/gem/i915_gem_object.h:39:6: error: shift count >= width of type [-Werror,-Wshift-count-overflow]

           if (overflows_type(size, obj->base.size))
           ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/i915/i915_utils.h:125:32: note: expanded from macro 'overflows_type'
           (sizeof(x) > sizeof(T) && (x) >> BITS_PER_TYPE(T))
                                         ^
   include/linux/compiler.h:56:47: note: expanded from macro 'if'
   #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
                              ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/compiler.h:58:61: note: expanded from macro '__trace_if_var'
   #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
                                                               ^~~~
   In file included from drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c:11:
   In file included from drivers/gpu/drm/i915/i915_drv.h:83:
   In file included from drivers/gpu/drm/i915/gt/intel_gt_types.h:18:
   In file included from drivers/gpu/drm/i915/gt/uc/intel_uc.h:9:
   In file included from drivers/gpu/drm/i915/gt/uc/intel_guc.h:17:
   In file included from drivers/gpu/drm/i915/i915_vma.h:34:

quoted

drivers/gpu/drm/i915/gem/i915_gem_object.h:39:6: error: shift count >= width of type [-Werror,-Wshift-count-overflow]

           if (overflows_type(size, obj->base.size))
           ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/i915/i915_utils.h:125:32: note: expanded from macro 'overflows_type'
           (sizeof(x) > sizeof(T) && (x) >> BITS_PER_TYPE(T))
                                         ^
   include/linux/compiler.h:56:47: note: expanded from macro 'if'
   #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
                              ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/compiler.h:58:86: note: expanded from macro '__trace_if_var'
   #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
                                                                       ~~~~~~~~~~~~~~~~~^~~~~
   include/linux/compiler.h:69:3: note: expanded from macro '__trace_if_value'
           (cond) ?                                        \
            ^~~~
   4 errors generated.


vim +39 drivers/gpu/drm/i915/gem/i915_gem_object.h

f0e4a06397526d Chris Wilson 2019-05-28  18  
ae2fb480f32f65 Matthew Auld 2021-01-22  19  /*
ae2fb480f32f65 Matthew Auld 2021-01-22  20   * XXX: There is a prevalence of the assumption that we fit the
ae2fb480f32f65 Matthew Auld 2021-01-22  21   * object's page count inside a 32bit _signed_ variable. Let's document
ae2fb480f32f65 Matthew Auld 2021-01-22  22   * this and catch if we ever need to fix it. In the meantime, if you do
ae2fb480f32f65 Matthew Auld 2021-01-22  23   * spot such a local variable, please consider fixing!
ae2fb480f32f65 Matthew Auld 2021-01-22  24   *
ae2fb480f32f65 Matthew Auld 2021-01-22  25   * Aside from our own locals (for which we have no excuse!):
ae2fb480f32f65 Matthew Auld 2021-01-22  26   * - sg_table embeds unsigned int for num_pages
ae2fb480f32f65 Matthew Auld 2021-01-22  27   * - get_user_pages*() mixed ints with longs
ae2fb480f32f65 Matthew Auld 2021-01-22  28   */
ae2fb480f32f65 Matthew Auld 2021-01-22  29  #define GEM_CHECK_SIZE_OVERFLOW(sz) \
ae2fb480f32f65 Matthew Auld 2021-01-22  30  	GEM_WARN_ON((sz) >> PAGE_SHIFT > INT_MAX)
ae2fb480f32f65 Matthew Auld 2021-01-22  31  
ae2fb480f32f65 Matthew Auld 2021-01-22  32  static inline bool i915_gem_object_size_2big(u64 size)
ae2fb480f32f65 Matthew Auld 2021-01-22  33  {
ae2fb480f32f65 Matthew Auld 2021-01-22  34  	struct drm_i915_gem_object *obj;
ae2fb480f32f65 Matthew Auld 2021-01-22  35  
ae2fb480f32f65 Matthew Auld 2021-01-22  36  	if (GEM_CHECK_SIZE_OVERFLOW(size))
ae2fb480f32f65 Matthew Auld 2021-01-22  37  		return true;
ae2fb480f32f65 Matthew Auld 2021-01-22  38  
ae2fb480f32f65 Matthew Auld 2021-01-22 @39  	if (overflows_type(size, obj->base.size))
ae2fb480f32f65 Matthew Auld 2021-01-22  40  		return true;
ae2fb480f32f65 Matthew Auld 2021-01-22  41  
ae2fb480f32f65 Matthew Auld 2021-01-22  42  	return false;
ae2fb480f32f65 Matthew Auld 2021-01-22  43  }
ae2fb480f32f65 Matthew Auld 2021-01-22  44  

:::::: The code at line 39 was first introduced by commit
:::::: ae2fb480f32f657d896d78b6214c2efebfa61993 drm/i915/gem: consolidate 2big error checking for object sizes

:::::: TO: Matthew Auld [off-list ref]
:::::: CC: Daniel Vetter [off-list ref]

---
0-DAY CI Kernel Test Service, Intel Corporation
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