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> On Fri, 23 Jan 2026 12:19:59 +0800 Philip Li wrote: > > > On Thu, Jan 22, 2026 at 01:23:35PM -0800, Andrew Morton wrote: > > > On Thu, 22 Jan 2026 16:04:37 +0800 kernel test robot wrote: > > > > > > > Hi Lorenzo, > > > > > > > > FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant. > > > > > > > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-new > > > > head: dc4fe40a11269aead253fa0beb098b00417b8694 > > > > commit: 57a654376d4bb67119d436edc8c3c4c0ecb3c369 [420/429] mm: update all remaining mmap_prepare users to use vma_flags_t > > > > config: sh-randconfig-r122-20260122 (https://download.01.org/0day-ci/archive/20260122/202601221505.RxftadLx-lkp@intel.com/config) > > > > > > Has CONFIG_NOMMU=y > > > > > > > compiler: sh4-linux-gcc (GCC) 13.4.0 > > > > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260122/202601221505.RxftadLx-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 > > > > | Closes: https://lore.kernel.org/oe-kbuild-all/202601221505.RxftadLx-lkp@intel.com/ > > > > > > > > sparse warnings: (new ones prefixed by >>) > > > > >> fs/romfs/mmap-nommu.c:66:42: sparse: sparse: dereference of noderef expression > > > > > > fs/romfs/Makefile has > > > > > > ifneq ($(CONFIG_MMU),y) > > > romfs-$(CONFIG_ROMFS_ON_MTD) += mmap-nommu.o > > > endif > > > > > > so why is mmap-nommu.o being compiled in this testing?? > > > > Hi Andrew, the related configs are set as below, and this is guarded > > with CONFIG_MMU, thus the build is triggered for mmap-nommu.o. > > > > # CONFIG_MMU is not set > > CONFIG_NOMMU=y > > Oh, OK, thanks, sorry, my brain ran out of multiple negation capacity. > > The code which this report quoted had > > > 66 return is_nommu_shared_vma_flags(desc->vma_flags) ? 0 : -ENOSYS; > > whereas Lorenzo's v2 patchset has > > return is_nommu_shared_vma_flags(&desc->vma_flags) ? 0 : -ENOSYS; > > so I expect that the new `&' fixed this issue. Well more so with the sparse stuff my removing the __private sparse decoration :) It actually ended up being counterproductive in practice, and the obvious 'wrong' thing of vma->flags.__vma_flags |= ... or whatever already signals to any reviewers that the kernel developer doing something like that is being 'naughty' so no need to enforce ACCESS_PRIVATE() etc., which in any case cannot work with the semantics we need for vma_flags_t. Cheers, Lorenzo