On Thu, 26 May 2022 05:35:20 +0800 kernel test robot <lkp@xxxxxxxxx> wrote: > tree/branch: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master > branch HEAD: 8cb8311e95e3bb58bd84d6350365f14a718faa6d Add linux-next specific files for 20220525 > > Error/Warning reports: > > ... > > Unverified Error/Warning (likely false positive, please contact us if interested): Could be so. > mm/shmem.c:1948 shmem_getpage_gfp() warn: should '(((1) << 12) / 512) << folio_order(folio)' be a 64 bit type? I've been seeing this one for a while. And from this report I can't figure out what tool emitted it. Clang? > > ... > > |-- i386-randconfig-m021 > | `-- mm-shmem.c-shmem_getpage_gfp()-warn:should-((()-)-)-folio_order(folio)-be-a-bit-type If you're going to use randconfig then shouldn't you make the config available? Or maybe quote the KCONFIG_SEED - presumably there's a way for others to regenerate. Anyway, the warning seems wrong to me. #define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT) #define BLOCKS_PER_PAGE (PAGE_SIZE/512) inode->i_blocks += BLOCKS_PER_PAGE << folio_order(folio); so the RHS here should have unsigned long type. Being able to generate the cpp output would be helpful. That requires the .config.
