[weiny2:ackerley-1g-master 55/75] arch/x86/kvm/../../../virt/kvm/guest_memfd.c:1388:37: warning: left shift count >= width of type

[kernel test robot <lkp@intel.com>]

tree:   https://github.com/weiny2/linux-kernel.git ackerley-1g-master
head:   773f26b5bef6e4d3094a33605165a5c6ab9aa0f0
commit: 0d68c26c85d69c2365731a23a9f4c392d26ceac7 [55/75] KVM: guest_memfd: Support guestmem_hugetlb as custom allocator
config: i386-allmodconfig (https://download.01.org/0day-ci/archive/20250519/202505192313.V76LPyVV-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250519/202505192313.V76LPyVV-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202505192313.V76LPyVV-lkp@intel.com/

All warnings (new ones prefixed by >>):

   arch/x86/kvm/../../../virt/kvm/guest_memfd.c: In function 'kvm_gmem_supports_shared':
   arch/x86/kvm/../../../virt/kvm/guest_memfd.c:904:26: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
     904 |         uint64_t flags = (uint64_t)inode->i_private;
         |                          ^
   arch/x86/kvm/../../../virt/kvm/guest_memfd.c: In function 'kvm_gmem_create':
>> arch/x86/kvm/../../../virt/kvm/guest_memfd.c:1388:37: warning: left shift count >= width of type [-Wshift-count-overflow]
    1388 |         (GUESTMEM_HUGETLB_FLAG_MASK << GUESTMEM_HUGETLB_FLAG_SHIFT)
         |                                     ^~
   arch/x86/kvm/../../../virt/kvm/guest_memfd.c:1405:32: note: in expansion of macro 'SUPPORTED_CUSTOM_ALLOCATOR_MASK'
    1405 |                                SUPPORTED_CUSTOM_ALLOCATOR_MASK;
         |                                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   In file included from <command-line>:
   arch/x86/kvm/../../../virt/kvm/guest_memfd.c: In function 'kvm_gmem_bind':
   include/linux/compiler_types.h:557:45: error: call to '__compiletime_assert_680' declared with attribute error: BUILD_BUG_ON failed: sizeof(gfn_t) != sizeof(slot->gmem.pgoff)
     557 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |                                             ^
   include/linux/compiler_types.h:538:25: note: in definition of macro '__compiletime_assert'
     538 |                         prefix ## suffix();                             \
         |                         ^~~~~~
   include/linux/compiler_types.h:557:9: note: in expansion of macro '_compiletime_assert'
     557 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |         ^~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
      39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
         |                                     ^~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:50:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
      50 |         BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
         |         ^~~~~~~~~~~~~~~~
   arch/x86/kvm/../../../virt/kvm/guest_memfd.c:1453:9: note: in expansion of macro 'BUILD_BUG_ON'
    1453 |         BUILD_BUG_ON(sizeof(gfn_t) != sizeof(slot->gmem.pgoff));
         |         ^~~~~~~~~~~~

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for HUGETLB_PAGE_OPTIMIZE_VMEMMAP
   Depends on [n]: ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP [=n] && SPARSEMEM_VMEMMAP [=n]
   Selected by [y]:
   - GUESTMEM_HUGETLB [=y]


vim +1388 arch/x86/kvm/../../../virt/kvm/guest_memfd.c

  1385	
  1386	/* Mask of bits belonging to allocators and are opaque to guest_memfd. */
  1387	#define SUPPORTED_CUSTOM_ALLOCATOR_MASK \
> 1388		(GUESTMEM_HUGETLB_FLAG_MASK << GUESTMEM_HUGETLB_FLAG_SHIFT)
  1389	

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