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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, Mar 31, 2026 at 11:23:41AM -0700, Andrew Morton wrote: > On Tue, 31 Mar 2026 11:27:20 +0200 kernel test robot wrote: > > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable > > head: 24e341657c283c965e3bfee0baa9ed0376127973 > > commit: cc0b04b10a7b98fd8df2fd539177e94e0f83a5c3 [121/130] selftests: ksft_exit_fail_perror: support printf style arguments > > config: arm64-allnoconfig-bpf (https://download.01.org/0day-ci/archive/20260331/202603311105.ysUeYPSZ-lkp@intel.com/config) > > compiler: aarch64-linux-gnu-gcc (Debian 14.2.0-19) 14.2.0 > > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260331/202603311105.ysUeYPSZ-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/202603311105.ysUeYPSZ-lkp@intel.com/ > > > > Note: the akpm-mm/mm-unstable HEAD 24e341657c283c965e3bfee0baa9ed0376127973 builds fine. > > It only hurts bisectability. > > > > All errors (new ones prefixed by >>): > > > > In file included from za-fork.c:12: > > ../../kselftest.h: In function 'ksft_exit_fail_perror': > > >> ../../kselftest.h:427:13: error: implicit declaration of function 'vasprintf'; did you mean 'vsprintf'? [-Wimplicit-function-declaration] > > 427 | if (vasprintf(&buf, msg, args) == -1) { > > | ^~~~~~~~~ > > | vsprintf > > What's going on here. vasprintf is a GNU thing, but that isn't it. > kselftest.h includes stdio.h directly so fine. I don't see anything in Sorry for the confusion, the build logic uses nolibc, which causes the wrong report. I will do some learning to correct my knowledge for how to build the kselftests side and update the bot. FYI: below is the detail make command used aarch64-linux-gnu-gcc -fno-asynchronous-unwind-tables -fno-ident -s -Os -nostdlib \ -static -include ../../../../include/nolibc/nolibc.h \ -I../.. -ffreestanding -Wall tpidr2.c -o tools/testing/selftests/arm64/abi/tpidr2 -lgcc In file included from tpidr2.c:6: ../../kselftest.h: In function 'ksft_exit_fail_perror': ../../kselftest.h:427:13: error: implicit declaration of function 'vasprintf'; did you mean 'vsprintf'? [-Wimplicit-function-declaration] 427 | if (vasprintf(&buf, msg, args) == -1) { | ^~~~~~~~~ | vsprintf > the later patches which could alter this, so the "only hurts > bisectability" is inexplicable. Sorry, you are right, this is a bug as well that the bisection does the wrong judgement, and the same issue also in HEAD 24e341657c28 after manual check with this nolibc build. I will look into the bug to fix it. Thanks > > I was able to reproduce this, once. Now it's gone away. > > > And arm64 allnoconfig is a nuisance. Now my vmlinux build immediately > faceplants with > > ./arch/arm64/include/asm/atomic_ll_sc.h:298:9: error: unknown type name 'u128' > 298 | u128 full; > > With the latest 15.2.0 kit from https://www.kernel.org/pub/tools/crosstool/. > >