linux-kernel - Re: [PATCH v5 1/6] perf bench futex: Add support for 32-bit systems with 64-bit time

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAK8P3a05D=fb9stZEL6rUMs7c=S6gJxN5gR7HG_i8RiXAbaB5Q@mail.gmail.com>
Date:   Fri, 10 Dec 2021 15:23:42 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Alistair Francis <alistair.francis@...nsource.wdc.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        Darren Hart <dvhart@...radead.org>,
        Arnd Bergmann <arnd@...db.de>,
        Alistair Francis <alistair23@...il.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>, linux-perf-users@...r.kernel.org,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Mark Rutland <mark.rutland@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        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 v5 1/6] perf bench futex: Add support for 32-bit systems
 with 64-bit time_t

On Fri, Dec 10, 2021 at 2:44 PM Arnaldo Carvalho de Melo
<acme@...nel.org> wrote:
> Em Fri, Dec 10, 2021 at 10:36:30AM -0300, Arnaldo Carvalho de Melo escreveu:
> > Em Fri, Dec 10, 2021 at 09:58:52AM +1000, Alistair Francis escreveu:
> > > 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.
> >
> >   10     9.99 alpine:3.12                   : FAIL gcc version 9.3.0 (Alpine 9.3.0)
> >     In file included from bench/futex-hash.c:29:
> >     bench/futex.h:37:2: error: unknown type name '__kernel_old_time_t'
> >        37 |  __kernel_old_time_t tv_sec;  /* seconds */
> >           |  ^~~~~~~~~~~~~~~~~~~
> >     In file included from bench/futex-wake.c:25:

It looks like we need to add include/uapi/linux/time_types.h to
tools/include/linux/ and update tools/include/linux/types.h
in order to address this.

         Arnd