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owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Andrew Morton writes: > On Fri, 23 Jan 2026 15:31:08 -0800 Ankur Arora wrote: > >> >> kernel test robot writes: >> >> > tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master >> > head: a0c666c25aeefd16f4b088c6549a6fb6b65a8a1d >> > commit: 93552c9a3350fff06543da18e4c80d3e804191ca [7919/9290] mm: folio_zero_user: cache neighbouring pages >> > config: riscv-randconfig-002-20260124 (https://download.01.org/0day-ci/archive/20260124/202601240453.QCjgGdJa-lkp@intel.com/config) >> > compiler: riscv64-linux-gcc (GCC) 8.5.0 >> > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260124/202601240453.QCjgGdJa-lkp@intel.com/reproduce) >> >> Oddly enough I'm unable to reproduce this with: >> ARCH=riscv CROSS_COMPILE=riscv64-linux-gnu- make O=build_dir/ W=1 mm/ > > I couldn't. gcc-15.2.0. I had gcc-12.1.1. >> > 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/202601240453.QCjgGdJa-lkp@intel.com/ >> > >> > All errors (new ones prefixed by >>): >> > >> > In file included from include/linux/mm.h:18, >> > from arch/riscv/include/asm/sections.h:9, >> > from include/linux/interrupt.h:22, >> > from include/linux/kernel_stat.h:8, >> > from mm/memory.c:42: >> > mm/memory.c: In function 'folio_zero_user': >> >>> include/linux/compiler_types.h:631:38: error: call to '__compiletime_assert_639' declared with attribute error: clamp() low limit pg.start greater than high limit pg.end >> >> I'm a bit puzzled by this assert. >> >> folio_zero_user(): >> { >> const unsigned long base_addr = ALIGN_DOWN(addr_hint, folio_size(folio)); >> const long fault_idx = (addr_hint - base_addr) / PAGE_SIZE; >> const struct range pg = DEFINE_RANGE(0, folio_nr_pages(folio) - 1); >> const int radius = FOLIO_ZERO_LOCALITY_RADIUS; >> struct range r[3]; >> int i; >> >> /* >> * Faulting page and its immediate neighbourhood. Will be cleared at the >> * end to keep its cachelines hot. >> */ >> r[2] = DEFINE_RANGE(clamp_t(s64, fault_idx - radius, pg.start, pg.end), >> clamp_t(s64, fault_idx + radius, pg.start, pg.end)); > > This line expands to 2846 bytes of C. The clamp()y functions are asking a lot > of the compiler - their development was drama-filled. > > If we want to work around this (and I guess we should) then simply > open-coding these operations would be a good approach? Yeah, let me work on that. -- ankur