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From: Joseph Myers <joseph@codesourcery.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: "fweimer@redhat.com" <fweimer@redhat.com>,
	"libc-alpha@sourceware.org" <libc-alpha@sourceware.org>,
	Andreas Schwab <schwab@suse.de>,
	Vineet Gupta <Vineet.Gupta1@synopsys.com>,
	"palmerdabbelt@google.com" <palmerdabbelt@google.com>,
	Lukasz Majewski <lukma@denx.de>,
	"zongbox@gmail.com" <zongbox@gmail.com>,
	Alistair Francis <alistair.francis@wdc.com>,
	"adhemerval.zanella@linaro.org" <adhemerval.zanella@linaro.org>,
	"macro@wdc.com" <macro@wdc.com>,
	Alistair Francis <alistair23@gmail.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: Thu, 20 Feb 2020 14:14:13 +0000
Message-ID: <alpine.DEB.2.21.2002201410010.19621@digraph.polyomino.org.uk> (raw)
In-Reply-To: <CAK8P3a3MTQf_fnEWiGVxzexZzYNQ34h29aNxH_YApmsVzY6OsA@mail.gmail.com>

On Thu, 20 Feb 2020, Arnd Bergmann wrote:

> But surely that structure layout would be the same on ARM and ARC
> as well as all other 32-bit architectures with _TIME_BITS=64, right?

Yes.

> What's wrong with having a single implementation for the most
> recent set of stat syscalls, with the older variants being only compiled
> for architectures that need them to support _TIME_BITS=32 and/or
> _FILE_OFFSET_BITS=32?

The ARC case should be a very simple patch, just changing a few 
conditionals so the statx path can be used on an architecture that also 
has the old syscalls.  No conditionals for whether to build a particular 
stat function, or for what that function is called, will be needed.  No 
conditionals for whether a syscall is available at runtime will be needed, 
because at least initially the port will be assuming Linux 5.1 or later.

In the Arm case, the code will need to allow for runtime fallback to old 
stat syscalls on kernels without statx, and will need to build the 
function using the new layout under a new name.  That's a much more 
complicated change that can build on top of the ARC change.

-- 
Joseph S. Myers
joseph@codesourcery.com

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Thread overview: 55+ 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
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
2020-02-12  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 [this message]

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