kernel.git/tools/testing/selftests/nolibc, branch master

tools/nolibc: Add a simple test for writing to a FILE and reading it back

2026-01-11T11:47:47Z

Add a test that exercises create->write->seek->read to check that using the stream functions (fwrite() etc) is not totally broken. The only edge cases this is testing for are: - Reading the file after writing but without rewinding reads nothing. - Trying to read more items than the file contains returns the count of fully read items. Signed-off-by: Daniel Palmer Link: https://patch.msgid.link/20260105023629.1502801-4-daniel@thingy.jp Signed-off-by: Thomas Weißschuh

selftests/nolibc: also test libc-test through regular selftest framework

2026-01-11T10:17:15Z

Hook up libc-test to the regular selftest build to make sure nolibc-test.c stays compatible with a normal libc. As the pattern rule from lib.mk does not handle compiling a target from a differently named source file, add an explicit rule definition. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260106-nolibc-selftests-v1-3-f82101c2c505@weissschuh.net

selftests/nolibc: scope custom flags to the nolibc-test target

2026-01-11T10:17:12Z

A new target for 'libc-test' is going to be added which should not be affected by these options. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260106-nolibc-selftests-v1-2-f82101c2c505@weissschuh.net

selftests/nolibc: try to read from stdin in readv_zero test

2026-01-11T10:17:07Z

When stdout is redirected to a file this test fails. This happens when running through the kselftest runner since commit d9e6269e3303 ("selftests/run_kselftest.sh: exit with error if tests fail"). For consistency with other tests that read from a file descriptor, switch to stdin over stdout. The tests are still brittle against a redirected stdin, but at least they are now consistently so. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260106-nolibc-selftests-v1-1-f82101c2c505@weissschuh.net

selftests/nolibc: always build sparc32 tests with -mcpu=v8

2026-01-06T11:30:16Z

Since LLVM commit 39e30508a7f6 ("[Driver][Sparc] Default to -mcpu=v9 for 32-bit Linux/sparc64 (#109278)"), clang defaults to -mcpu=v9 for 32-bit SPARC builds. -mcpu=v9 generates instructions which are not recognized by qemu-sparc and qemu-system-sparc. Explicitly enforce -mcpu=v8 to generate compatible code. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260106-nolibc-sparc32-fix-v2-1-7c5cd6b175c2@weissschuh.net

selftests/nolibc: drop NOLIBC_SYSROOT=0 logic

2026-01-06T11:08:09Z

This logic was added in commit 850fad7de827 ("selftests/nolibc: allow test -include /path/to/nolibc.h") to allow the testing of -include /path/to/nolibc.h. As it requires as special variable to activate, this code is nearly never used. Furthermore it complicates the logic a bit. Since commit a6a054c8ad32 ("tools/nolibc: add target to check header usability") and commit 443c6467fcd6 ("selftests/nolibc: always run nolibc header check") the usability of -include /path/to/nolibc.h is always checked anyways, making NOLIBC_SYSROOT=0 pointless. Drop the special logic. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260104-nolibc-nolibc_sysroot-v1-1-98025ad99add@weissschuh.net

selftests/nolibc: test compatibility of nolibc and kernel time types

2026-01-06T11:08:04Z

Keeping 'struct timespec' and 'struct __kernel_timespec' compatible allows the source code to stay simple. Validate that the types stay compatible. The test is specific to nolibc and does not compile on other libcs, so skip it there. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Reviewed-by: Arnd Bergmann Link: https://patch.msgid.link/20251220-nolibc-uapi-types-v3-10-c662992f75d7@weissschuh.net

tools/nolibc: add ptrace support

2026-01-04T09:28:44Z

Add ptrace support, as it will be useful in UML. Signed-off-by: Benjamin Berg [Thomas: drop va_args usage and linux/uio.h inclusion] Signed-off-by: Thomas Weißschuh

Merge tag 'nolibc-20251130-for-6.19-1' of git://git.kernel.org/pub/scm/linux/kernel/git/nolibc/linux-nolibc

2025-12-03T17:23:25Z

Pull nolibc updates from Thomas Weißschuh: - Preparations to the use of nolibc in UML: - Cleanup of sparse warnings - Library mode without _start() - More consistency when disabling errno - Unconditional installation of all architecture support files - Always 64-bit wide ino_t and off_t - Various cleanups and bug fixes * tag 'nolibc-20251130-for-6.19-1' of git://git.kernel.org/pub/scm/linux/kernel/git/nolibc/linux-nolibc: (25 commits) selftests/nolibc: error out on linker warnings selftests/nolibc: use lld to link loongarch binaries tools/nolibc: remove more __nolibc_enosys() fallbacks tools/nolibc: remove now superfluous overflow check in llseek tools/nolibc: use 64-bit off_t tools/nolibc: prefer the llseek syscall tools/nolibc: handle 64-bit off_t for llseek tools/nolibc: use 64-bit ino_t tools/nolibc: avoid using plain integer as NULL pointer tools/nolibc: add support for fchdir() tools/nolibc: clean up outdated comments in generic arch.h tools/nolibc: make the "headers" target install all supported archs tools/nolibc: add the more portable inttypes.h tools/nolibc: provide the portable sys/select.h tools/nolibc: add missing memchr() to string.h tools/nolibc: fix misleading help message regarding installation path tools/nolibc: add uio.h with readv and writev tools/nolibc: add option to disable runtime tools/nolibc: use __fallthrough__ rather than fallthrough tools/nolibc: implement %m if errno is not defined ...

selftests/nolibc: error out on linker warnings

2025-11-22T11:35:12Z

If the linker emits warnings these should abort the build. Otherwise they will be swallowed by run-tests.sh and not shown. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau