linux-stable.git/tools/include/nolibc, branch v6.18

tools/nolibc: add stdbool.h to nolibc includes

2025-09-25T16:47:08+00:00

Otherwise tests compiled with only "-include nolibc.h" will fail with
"error: unknown type name 'bool'", even though a stdbool.h is available
from nolibc.

Fixes: ae1f550efc11 ("tools/nolibc: add stdbool.h header")
Fixes: f2662ec26b26 ("selftests: kselftest: Create ksft_print_dbg_msg()")
Reported-by: Mark Brown 
Closes: https://lore.kernel.org/lkml/833f5ae5-190e-47ec-9ad9-127ad166c80c@sirena.org.uk/
Signed-off-by: André Almeida 
[Thomas: add Fixes tags and massage commit message a bit]
Signed-off-by: Thomas Weißschuh

tools/nolibc: make time_t robust if __kernel_old_time_t is missing in host headers

2025-09-20T09:06:37+00:00

Commit d5094bcb5bfd ("tools/nolibc: define time_t in terms of
__kernel_old_time_t") made nolibc use the kernel's time type so that
`time_t` matches `timespec::tv_sec` on all ABIs (notably x32).

But since __kernel_old_time_t is fairly new, notably from 2020 in commit
94c467ddb273 ("y2038: add __kernel_old_timespec and __kernel_old_time_t"),
nolibc builds that rely on host headers may fail.

Switch to __kernel_time_t, which is the same as __kernel_old_time_t and
has existed for longer.

Tested in PPC VM of Open Source Lab of Oregon State University
(./tools/testing/selftests/rcutorture/bin/mkinitrd.sh)

Fixes: d5094bcb5bfd ("tools/nolibc: define time_t in terms of __kernel_old_time_t")
Signed-off-by: Zhouyi Zhou 
[Thomas: Reformat commit and its message a bit]
Signed-off-by: Thomas Weißschuh

tools/nolibc: drop wait4() support

2025-09-01T18:48:40+00:00

Not all architectures implement the wait4() syscall. It can be
implemented in terms of the waitid() syscall, but that would require
some rework of the other wait-related functions in wait.h.

As wait4() is non-standard and deprecated, remove it.

Signed-off-by: Thomas Weißschuh 
Acked-by: Willy Tarreau 
Link: https://lore.kernel.org/r/20250821-nolibc-enosys-v1-7-4b63f2caaa89@weissschuh.net

tools/nolibc: fold llseek fallback into lseek()

2025-09-01T18:47:54+00:00

Align the implementation of the fallback handling inside sys_lseek()
with the rest of nolibc.

Signed-off-by: Thomas Weißschuh 
Acked-by: Willy Tarreau 
Link: https://lore.kernel.org/r/20250821-nolibc-enosys-v1-5-4b63f2caaa89@weissschuh.net

tools/nolibc: remove __nolibc_enosys() fallback from fork functions

2025-09-01T18:47:54+00:00

All architectures have one of the real functions available.
The additional fallback to __nolibc_enosys() is superfluous.

Signed-off-by: Thomas Weißschuh 
Acked-by: Willy Tarreau 
Link: https://lore.kernel.org/r/20250821-nolibc-enosys-v1-4-4b63f2caaa89@weissschuh.net

tools/nolibc: remove __nolibc_enosys() fallback from dup2()

2025-09-01T18:47:53+00:00

All architectures have one of the real functions available.
The additional fallback to __nolibc_enosys() is superfluous.

Signed-off-by: Thomas Weißschuh 
Acked-by: Willy Tarreau 
Link: https://lore.kernel.org/r/20250821-nolibc-enosys-v1-3-4b63f2caaa89@weissschuh.net

tools/nolibc: remove __nolibc_enosys() fallback from *at() functions

2025-09-01T18:47:52+00:00

All architectures have had one of the real functions available since
Linux 2.6.12. The additional fallback to __nolibc_enosys() is superfluous.

Signed-off-by: Thomas Weißschuh 
Acked-by: Willy Tarreau 
Link: https://lore.kernel.org/r/20250821-nolibc-enosys-v1-2-4b63f2caaa89@weissschuh.net

tools/nolibc: remove __nolibc_enosys() fallback from time64-related functions

2025-09-01T18:47:51+00:00

These fallbacks where added when no explicit fallbacks for time64 was
implemented. Now that these fallbacks are in place, the additional
fallback to __nolibc_enosys() is superfluous.

Signed-off-by: Thomas Weißschuh 
Acked-by: Willy Tarreau 
Link: https://lore.kernel.org/r/20250821-nolibc-enosys-v1-1-4b63f2caaa89@weissschuh.net

tools/nolibc: use tabs instead of spaces for indentation

2025-09-01T18:47:50+00:00

Some lines are using spaces for indentation instead of the standard tabs.

Fix them.

Signed-off-by: Thomas Weißschuh

tools/nolibc: avoid error in dup2() if old fd equals new fd

2025-09-01T18:47:36+00:00

dup2() allows both 'old' and 'new' to have the same value, which dup3()
does not. If libc dup2() is implemented through the dup3() system call,
then it would incorrectly fail in this case.

Avoid the error by handling old == new explicitly.

Fixes: 30ca20517ac1 ("tools headers: Move the nolibc header from rcutorture to tools/include/nolibc/")
Signed-off-by: Thomas Weißschuh 
Acked-by: Willy Tarreau 
Link: https://lore.kernel.org/r/20250820-nolibc-dup2-einval-v2-1-807185a45c56@linutronix.de
Signed-off-by: Thomas Weißschuh