From: Arnd Bergmann <arnd@arndb.de>
To: "Jason A. Donenfeld" <Jason@zx2c4.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"open list:BROADCOM NVRAM DRIVER" <linux-mips@vger.kernel.org>,
Paul Burton <paulburton@kernel.org>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
Christian Brauner <christian.brauner@canonical.com>
Subject: Re: [PATCH] mips: vdso: conditionalize 32-bit time functions on COMPAT_32BIT_TIME
Date: Mon, 30 Dec 2019 16:47:37 +0100 [thread overview]
Message-ID: <CAK8P3a0NBuqDX63+920q7Q+yO2xCoSd0O7xUDJv6BBoco2kVOg@mail.gmail.com> (raw)
In-Reply-To: <CAHmME9pnBtjJ86gsWgK8DCYKo_HFpyViHoGpJPTrYBONT01YVA@mail.gmail.com>
On Mon, Dec 30, 2019 at 4:39 PM Jason A. Donenfeld <Jason@zx2c4.com> wrote:
>
> On Mon, Dec 30, 2019 at 4:37 PM Arnd Bergmann <arnd@arndb.de> wrote:
> >
> > On Mon, Dec 30, 2019 at 3:37 PM Jason A. Donenfeld <Jason@zx2c4.com> wrote:
> > >
> > > On Mon, Dec 30, 2019 at 1:34 PM Arnd Bergmann <arnd@arndb.de> wrote:
> > Returning success from clock_gettime() on a kernel with only
> > time64 support and a libc with only time32 support (or vice
> > versa) would be a bug.
>
> Ah, right, hence why the 32-bit compat code is behind a
> still-on-by-default-but-not-for-long menu option.
I expect this to remain on-by-default for a rather long time, as we still
to run old binaries well into 2030s. Making it configurable is done for
two reasons:
- on embedded systems that have all user space built with time64,
turning this off can make the kernel slightly smaller
- turning it off lets you check that no code relies on calling the old
interfaces internally, bypassing the C library, in a way that works
at the moment but may break after 2038.
Arnd
next prev parent reply other threads:[~2019-12-30 15:47 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-23 13:08 vdso-related userspace crashes on 5.5 mips64 Jason A. Donenfeld
2019-12-23 21:44 ` Jason A. Donenfeld
2019-12-23 23:29 ` Paul Burton
2019-12-24 13:37 ` Jason A. Donenfeld
2019-12-30 15:58 ` Arnd Bergmann
2019-12-24 14:19 ` Jason A. Donenfeld
2019-12-24 13:54 ` [PATCH] mips: vdso: conditionalize 32-bit time functions on COMPAT_32BIT_TIME Jason A. Donenfeld
2019-12-30 11:57 ` Arnd Bergmann
2019-12-30 12:26 ` Jason A. Donenfeld
2019-12-30 12:34 ` Arnd Bergmann
2019-12-30 14:37 ` Jason A. Donenfeld
2019-12-30 15:10 ` Jason A. Donenfeld
2019-12-30 15:37 ` Arnd Bergmann
2019-12-30 15:39 ` Jason A. Donenfeld
2019-12-30 15:47 ` Arnd Bergmann [this message]
2019-12-30 15:58 ` Jason A. Donenfeld
2019-12-30 17:33 ` Arnd Bergmann
2019-12-30 21:09 ` Jason A. Donenfeld
2019-12-30 21:42 ` Jason A. Donenfeld
2019-12-31 16:14 ` Jason A. Donenfeld
2020-01-01 4:10 ` Paul Burton
2020-01-01 4:25 ` Paul Burton
2020-01-01 9:47 ` Jason A. Donenfeld
2020-01-01 9:47 ` Jason A. Donenfeld
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAK8P3a0NBuqDX63+920q7Q+yO2xCoSd0O7xUDJv6BBoco2kVOg@mail.gmail.com \
--to=arnd@arndb.de \
--cc=Jason@zx2c4.com \
--cc=christian.brauner@canonical.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mips@vger.kernel.org \
--cc=paulburton@kernel.org \
--cc=vincenzo.frascino@arm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).