From: Alistair Francis <alistair23@gmail.com>
To: Joseph Myers <joseph@codesourcery.com>
Cc: Florian Weimer <fweimer@redhat.com>,
GNU C Library <libc-alpha@sourceware.org>,
Arnd Bergmann <arnd@arndb.de>, Vineet Gupta <vineetg76@gmail.com>,
Palmer Dabbelt <palmerdabbelt@google.com>,
Zong Li <zongbox@gmail.com>,
Alistair Francis <alistair.francis@wdc.com>,
Adhemerval Zanella <adhemerval.zanella@linaro.org>,
"Maciej W. Rozycki" <macro@wdc.com>,
arcml <linux-snps-arc@lists.infradead.org>
Subject: Re: [RFC v6 07/23] RISC-V: Use 64-bit time_t and off_t for RV32 and RV64
Date: Fri, 14 Feb 2020 14:39:19 -0800 [thread overview]
Message-ID: <CAKmqyKOgFRfMOws_-48GqMnuS3ygmN9A4DzLg6UtEjRXVoM82A@mail.gmail.com> (raw)
In-Reply-To: <alpine.DEB.2.21.2002120123230.3988@digraph.polyomino.org.uk>
On Tue, Feb 11, 2020 at 5:30 PM Joseph Myers <joseph@codesourcery.com> wrote:
>
> On Tue, 11 Feb 2020, Alistair Francis wrote:
>
> > > > diff --git a/sysdeps/unix/sysv/linux/riscv/bits/typesizes.h b/sysdeps/unix/sysv/linux/riscv/bits/typesizes.h
> > > > new file mode 100644
> > > > index 0000000000..0da3bdeb5d
> > > > --- /dev/null
> > > > +++ b/sysdeps/unix/sysv/linux/riscv/bits/typesizes.h
> > >
> > > I was hoping newer arches could simply use the asm-generic one ?
> >
> > We need to specify that RV32 uses a 64-bit time_t. The generic ones
> > don't do that for 32-bit arches.
>
> Since it seems we'd like future 32-bit ports of glibc to use 64-bit time
> and offsets, we should make that as easy as possible.
>
> That is, you need an RISC-V-specific bits/timesize.h. But you shouldn't
> need an RISC-V-specific bits/typesizes.h - rather, make the linux/generic
> one do the right thing for __TIME_T_TYPE based on bits/timesize.h. And
> have some other header that 32-bit linux/generic ports can use to say
> whether they use the 64-bit offset/stat/statfs interface, that
> bits/typesizes.h can use together with its existing __LP64__ check, and
> make the definitions of __OFF_T_TYPE etc. check that as well, and then you
> shouldn't need an RISC-V-specific bits/typesizes.h - the RISC-V-specific
> headers should be strictly minimal. (No architecture-specific
> bits/time64.h headers should be needed in any case.)
Ok, I have updated this. I'll send the patch once my "Always use
32-bit time_t for certain syscalls" series is in (the headers are
changed in that series).
Alistair
>
> At some point (or indeed now) we might flip the default for linux/generic
> so the architectures needing an architecture-specific header are only the
> older 32-bit linux/generic architectures that have support for 32-bit
> times and offsets, and the newer ones with no such support don't need such
> a header.
>
> --
> Joseph S. Myers
> joseph@codesourcery.com
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next prev parent reply other threads:[~2020-02-14 22:46 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1578824547.git.alistair.francis@wdc.com>
[not found] ` <4e95f95966d8d7c6a8339160dc62d81c1f6a1bfb.1578824547.git.alistair.francis@wdc.com>
2020-02-12 0:14 ` [RFC v6 07/23] RISC-V: Use 64-bit time_t and off_t for RV32 and RV64 Vineet Gupta
2020-02-12 0:14 ` Alistair Francis
2020-02-12 1:30 ` Joseph Myers
2020-02-14 22:39 ` Alistair Francis [this message]
2020-02-18 23:05 ` switching ARC to 64-bit time_t (Re: [RFC v6 07/23] RISC-V: Use 64-bit time_t and off_t for RV32 and RV64) Vineet Gupta
2020-02-18 23:13 ` Joseph Myers
2020-02-19 23:09 ` Lukasz Majewski
2020-02-19 23:11 ` Lukasz Majewski
2020-02-20 8:31 ` Arnd Bergmann
2020-02-20 9:37 ` Lukasz Majewski
2020-02-20 12:37 ` Arnd Bergmann
2020-02-20 13:14 ` Lukasz Majewski
2020-02-20 14:44 ` Arnd Bergmann
2020-02-20 15:42 ` Lukasz Majewski
2020-02-20 16:08 ` Arnd Bergmann
2020-02-20 16:31 ` Lukasz Majewski
2020-02-24 2:48 ` Viresh Kumar
2020-02-21 19:56 ` Alistair Francis
2020-02-22 8:42 ` Arnd Bergmann
2020-02-24 9:00 ` Lukasz Majewski
2020-02-24 9:46 ` Andreas Schwab
2020-02-24 10:14 ` Lukasz Majewski
2020-02-24 10:23 ` Andreas Schwab
2020-02-24 10:36 ` Lukasz Majewski
2020-02-24 10:42 ` Andreas Schwab
2020-02-24 11:13 ` Lukasz Majewski
2020-02-24 12:41 ` Lukasz Majewski
2020-02-25 0:03 ` Joseph Myers
2020-02-25 11:39 ` Lukasz Majewski
2020-02-25 14:36 ` Joseph Myers
2020-02-26 13:18 ` Lukasz Majewski
2020-02-26 14:48 ` Joseph Myers
2020-02-26 16:28 ` Lukasz Majewski
2020-02-25 9:03 ` Arnd Bergmann
2020-02-20 16:27 ` Helmut Grohne
2020-03-26 0:25 ` ARC rebootstrap prereq (was Re: switching ARC to 64-bit time_t ) Vineet Gupta
2020-03-26 5:54 ` Helmut Grohne
2020-03-26 11:51 ` Alexey Brodkin
2020-03-26 12:24 ` Helmut Grohne
2020-03-26 12:53 ` Alexey Brodkin
2020-03-26 14:28 ` Helmut Grohne
2020-03-26 19:04 ` Lennart Sorensen
2020-08-26 14:39 ` Vineet Gupta
2020-08-26 15:43 ` Helmut Grohne
2020-08-26 21:16 ` Aurelien Jarno
2021-02-24 20:17 ` Vineet Gupta
2021-02-26 9:47 ` Helmut Grohne
2021-02-26 15:58 ` Vineet Gupta
2021-08-21 17:36 ` Aurelien Jarno
2020-02-12 1:42 ` [RFC v6 07/23] RISC-V: Use 64-bit time_t and off_t for RV32 and RV64 Vineet Gupta
2020-02-12 12:58 ` Arnd Bergmann
2020-02-19 0:56 ` Vineet Gupta
2020-02-19 1:03 ` Alistair Francis
2020-02-19 1:31 ` Vineet Gupta
2020-02-19 8:30 ` Andreas Schwab
2020-02-19 18:42 ` Vineet Gupta
2020-02-19 23:18 ` Lukasz Majewski
2020-02-20 0:26 ` Vineet Gupta
2020-02-20 0:46 ` Joseph Myers
2020-02-20 8:24 ` Arnd Bergmann
2020-02-20 10:28 ` Lukasz Majewski
2020-02-20 14:14 ` Joseph Myers
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