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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
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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Thread overview: 58+ 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   ` 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
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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