linux-kernel - Re: [PATCH v3 1/6] perf bench futex: Add support for 32-bit systems with 64-bit time

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Message-ID: <CAK8P3a1WPgrkw5N9acSZ1bRPjBUS0bXSjSBRSW2pYA-m-mc=Qw@mail.gmail.com>
Date:   Fri, 26 Nov 2021 08:19:53 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Alistair Francis <alistair.francis@...nsource.wdc.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Arnd Bergmann <arnd@...db.de>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Alistair Francis <alistair23@...il.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Ingo Molnar <mingo@...hat.com>,
        Darren Hart <dvhart@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        linux-perf-users@...r.kernel.org,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Alistair Francis <alistair.francis@....com>,
        Atish Patra <atish.patra@....com>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH v3 1/6] perf bench futex: Add support for 32-bit systems
 with 64-bit time_t

On Fri, Nov 26, 2021 at 7:00 AM Alistair Francis
<alistair.francis@...nsource.wdc.com> wrote:
> From: Alistair Francis <alistair.francis@....com>
>
> Some 32-bit architectures (such are 32-bit RISC-V) only have a 64-bit
> time_t and as such don't have the SYS_futex syscall. This patch will
> allow us to use the SYS_futex_time64 syscall on those platforms.
>
> This also converts the futex calls to be y2038 safe (when built for a
> 5.1+ kernel).
>
> This is a revert of commit ba4026b09d83acf56c040b6933eac7916c27e728
> "Revert "perf bench futex: Add support for 32-bit systems with 64-bit time_t"".
>
> The original commit was reverted as including linux/time_types.h would
> fail to compile on older kernels. This commit doesn't include
> linux/time_types.h to avoid this issue.
>
> Signed-off-by: Alistair Francis <alistair.francis@....com>


Reviewed-by: Arnd Bergmann <arnd@...db.de>