[linux-next:master 12362/13055] include/vdso/bits.h:7:26: warning: left shift count >= width of type

[linux-next:master 12362/13055] include/vdso/bits.h:7:26: warning: left shift count >= width of type

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   47b7b5e32bb7264b51b89186043e1ada4090b558
commit: 256a21743d911f94ce92fe28f793cd586f3860b2 [12362/13055] i3c: Add HDR API support
config: sparc-randconfig-001-20251202 (https://download.01.org/0day-ci/archive/20251202/202512021613.97jVprvJ-lkp@intel.com/config)
compiler: sparc-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251202/202512021613.97jVprvJ-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/202512021613.97jVprvJ-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/bits.h:5,
                    from include/linux/ratelimit_types.h:5,
                    from include/linux/printk.h:9,
                    from include/asm-generic/bug.h:22,
                    from arch/sparc/include/asm/bug.h:25,
                    from include/linux/bug.h:5,
                    from drivers/i3c/device.c:9:
   drivers/i3c/device.c: In function 'i3c_device_get_supported_xfer_mode':
>> include/vdso/bits.h:7:26: warning: left shift count >= width of type [-Wshift-count-overflow]
    #define BIT(nr)   (UL(1) << (nr))
                             ^~
   drivers/i3c/device.c:272:61: note: in expansion of macro 'BIT'
     return i3c_dev_get_master(dev->desc)->this->info.hdr_cap | BIT(I3C_SDR);
                                                                ^~~
--
   In file included from include/linux/bits.h:5,
                    from include/linux/ratelimit_types.h:5,
                    from include/linux/printk.h:9,
                    from include/asm-generic/bug.h:22,
                    from arch/sparc/include/asm/bug.h:25,
                    from include/linux/bug.h:5,
                    from device.c:9:
   device.c: In function 'i3c_device_get_supported_xfer_mode':
>> include/vdso/bits.h:7:26: warning: left shift count >= width of type [-Wshift-count-overflow]
    #define BIT(nr)   (UL(1) << (nr))
                             ^~
   device.c:272:61: note: in expansion of macro 'BIT'
     return i3c_dev_get_master(dev->desc)->this->info.hdr_cap | BIT(I3C_SDR);
                                                                ^~~


vim +7 include/vdso/bits.h

3945ff37d2f48d Vincenzo Frascino 2020-03-20  6  
3945ff37d2f48d Vincenzo Frascino 2020-03-20 @7  #define BIT(nr)			(UL(1) << (nr))
cbdb1f163af2bb Andy Shevchenko   2022-11-28  8  #define BIT_ULL(nr)		(ULL(1) << (nr))
3945ff37d2f48d Vincenzo Frascino 2020-03-20  9  

:::::: The code at line 7 was first introduced by commit
:::::: 3945ff37d2f48d39fd1751d282c80176654049e4 linux/bits.h: Extract common header for vDSO

:::::: TO: Vincenzo Frascino <vincenzo.frascino@arm.com>
:::::: CC: Thomas Gleixner <tglx@linutronix.de>

-- 
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https://github.com/intel/lkp-tests/wiki