linux-kernel - Re: [PATCH v2 1/2] perf bench futex: Use a 64-bit time

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Message-ID: <CAK8P3a28zpO5Sy78CHts=p4G5v0bhxeCJhUK41bMQ8nqYV8z_A@mail.gmail.com>
Date:   Fri, 15 Oct 2021 10:04:41 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Alistair Francis <alistair.francis@...nsource.wdc.com>
Cc:     linux-riscv <linux-riscv@...ts.infradead.org>,
        linux-perf-users@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Alistair Francis <alistair23@...il.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Mark Rutland <mark.rutland@....com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        Darren Hart <dvhart@...radead.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Atish Patra <atish.patra@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Alistair Francis <alistair.francis@....com>
Subject: Re: [PATCH v2 1/2] perf bench futex: Use a 64-bit time_t

On Fri, Oct 15, 2021 at 2:56 AM Alistair Francis
<alistair.francis@...nsource.wdc.com> wrote:
>
> From: Alistair Francis <alistair.francis@....com>
>
> Convert tools/perf to only use a 64-bit time_t. On 64-bit architectures
> this isn't a functional change. On 32-bit architectures we now only
> perform 64-bit time_t syscalls (__NR_futex_time64) and use a struct
> timespec64.
>
> This won't work on kernels before 5.1, but as perf is tied to the kernel
> that's ok.
>
> This allows us to build perf for 32-bit architectures with 64-bit time_t
> like RISC-V 32-bit.
>
> Signed-off-by: Alistair Francis <alistair.francis@....com>

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