From: Cynthia Huang cynthia@andestech.com

Linux kernel does not provide sys_futex() on some 32-bit architectures that do not support 32-bit time representations, such as riscv32. As a result, glibc cannot define SYS_futex, causing compilation failures in tests that rely on this syscall. Define SYS_futex as SYS_futex_time64 in such cases to ensure successful compilation and compatibility.

Signed-off-by: Cynthia Huang cynthia@andestech.com Signed-off-by: Ben Zong-You Xie ben717@andestech.com Reviewed-by: Muhammad Usama Anjum usama.anjum@collabora.com --- Changes since v2: - Refine the commit message suggested by tglx - Attribute the authorship to Cynthia - Add the Reviewed-by tag from Muhammad

v2 : https://lore.kernel.org/all/20250627090812.937939-1-ben717@andestech.com/

Changes since v1: - Fix the SOB chain

v1 : https://lore.kernel.org/all/20250527093536.3646143-1-ben717@andestech.com/ --- tools/testing/selftests/futex/include/futextest.h | 11 +++++++++++ 1 file changed, 11 insertions(+)

diff --git a/tools/testing/selftests/futex/include/futextest.h b/tools/testing/selftests/futex/include/futextest.h index ddbcfc9b7bac..7a5fd1d5355e 100644 --- a/tools/testing/selftests/futex/include/futextest.h +++ b/tools/testing/selftests/futex/include/futextest.h @@ -47,6 +47,17 @@ typedef volatile u_int32_t futex_t; FUTEX_PRIVATE_FLAG) #endif

+/* + * SYS_futex is expected from system C library, in glibc some 32-bit + * architectures (e.g. RV32) are using 64-bit time_t, therefore it doesn't have + * SYS_futex defined but just SYS_futex_time64. Define SYS_futex as + * SYS_futex_time64 in this situation to ensure the compilation and the + * compatibility. + */ +#if !defined(SYS_futex) && defined(SYS_futex_time64) +#define SYS_futex SYS_futex_time64 +#endif + /** * futex() - SYS_futex syscall wrapper * @uaddr: address of first futex -- 2.34.1