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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [10.10.161.89] Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, When building perf for ARC (v5.1-rc2) I get the following | In file included from bench/futex-hash.c:26: | bench/futex.h: In function 'futex_wait': | bench/futex.h:37:10: error: 'SYS_futex' undeclared (first use in this function); git bisect led to 1a787fc5ba18ac767e635c58d06a0b46876184e3 ("tools headers uapi: Sync copy of asm-generic/unistd.h with the kernel sources") The issue is due to hunk below, rightly brought over from commit c8ce48f06503 ("asm-generic: Make time32 syscall numbers optional") +#if defined(__ARCH_WANT_TIME32_SYSCALLS) || __BITS_PER_LONG != 32 #define __NR_futex 98 -__SC_COMP(__NR_futex, sys_futex, compat_sys_futex) +__SC_3264(__NR_futex, sys_futex_time32, sys_futex) +#endif While __ARCH_WANT_TIME32_SYSCALLS does exist in arch/arc/include/uapi/asm/unistd.h, but not inside tools, essentially we lack a copy such as below which were sync'ed by commit above as well. tools/arch/arm64/include/uapi/asm/unistd.h tools/arch/x86/include/uapi/asm/unistd.h A quick fix for ARC will be to create our own version but I presume all existing arches using generic syscall abi are affected. Thoughts ? In lack of ideas I'll send out a patch for ARC. P.S. Why do we need the unistd.h duplication in tools directory, given it could have used the in-tree unistd headers directly ? Thx, -Vineet