linux/tools/testing/selftests/nolibc, branch master

selftests/nolibc: use gcc 15

2026-04-09T21:25:45Z

Newer compilers tend to detect more problematic code. Update the testsuite to use gcc 15.2.0 by default. Signed-off-by: Thomas Weißschuh Link: https://patch.msgid.link/20260408-nolibc-gcc-15-v1-3-330d0c40f894@weissschuh.net

selftests/nolibc: don't skip tests for unimplemented syscalls anymore

2026-04-07T07:29:26Z

The automatic skipping of tests on ENOSYS returns was introduced in commit 349afc8a52f8 ("selftests/nolibc: skip tests for unimplemented syscalls"). It handled the fact that nolibc would return ENOSYS for many syscall wrappers on riscv32. Nowadays nolibc handles all these correctly, so this logic is not used anymore. To make missing nolibc functionality more obvious fail the tests again if something is not implemented. Revert the mentioned commit again. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260406-nolibc-no-skip-enosys-v1-2-c046b1ac7d73@weissschuh.net/

selftests/nolibc: explicitly handle ENOSYS from ptrace()

2026-04-07T07:28:32Z

The automatic ENOSYS handling in EXPECT_SYSER() is about to be removed. ptrace() will return legitimately return ENOSYS on qemu-user, so handle it explicitly. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260406-nolibc-no-skip-enosys-v1-1-c046b1ac7d73@weissschuh.net/

tools/nolibc: add byteorder conversions

2026-04-07T07:27:25Z

Add some standard functions to convert between different byte orders. Conveniently the UAPI headers provide all the necessary functionality. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260405-nolibc-bswap-v1-1-f7699ca9cee0@weissschuh.net

tools/nolibc: add the _syscall() macro

2026-04-07T07:27:07Z

The standard syscall() function or macro uses the libc return value convention. Errors returned from the kernel as negative values are stored in errno and -1 is returned. Users who want to avoid using errno don't have a way to call raw syscalls and check the returned error. Add a new macro _syscall() which works like the standard syscall() but passes through the return value from the kernel unchanged. The naming scheme and return values match the named _sys_foo() system call wrappers already part of nolibc. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260405-nolibc-syscall-v1-3-e5b12bc63211@weissschuh.net

selftests/nolibc: only use libgcc when really necessary

2026-04-06T17:46:54Z

nolibc should work without libgcc to be compatible with as many toolchains as possible. Currently the functionality tested by nolibc-test does not contain any dependencies, make sure it stays this way by not linking libgcc anymore. On the ppc target GCC always emits references to '_restgpr_' functions, so keep linking libgcc there. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260404-nolibc-libgcc-v1-1-eb3ecfe0e176@weissschuh.net

selftests/nolibc: test the memory allocator

2026-04-06T17:46:52Z

The memory allocator has not seen any testing so far. Add a simple testcase for it. Suggested-by: Willy Tarreau Link: https://lore.kernel.org/lkml/adDRK8D6YBZgv36H@1wt.eu/ Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260404-nolibc-asprintf-v2-2-17d2d0df9763@weissschuh.net

tools/nolibc: add support for asprintf()

2026-04-06T17:46:51Z

Add support for dynamically allocating formatted strings through asprintf() and vasprintf(). Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260401-nolibc-asprintf-v1-3-46292313439f@weissschuh.net

tools/nolibc: handle all major and minor numbers in makedev() and friends

2026-04-04T08:29:02Z

Remove the limitation of only handling small major and minor numbers. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260404-nolibc-makedev-v2-5-456a429bf60c@weissschuh.net

selftests/nolibc: add a test for stat().st_rdev

2026-04-04T08:28:44Z

The handling of 'dev_t' values is about to be changed. Add a test to make sure they are returned correctly from stat(). Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260404-nolibc-makedev-v2-2-456a429bf60c@weissschuh.net