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Re: New kernel interface for sys_tz and timewarp?
- From: Thomas Gleixner <tglx at linutronix dot de>
- To: Karel Zak <kzak at redhat dot com>
- Cc: Alexandre Belloni <alexandre dot belloni at bootlin dot com>, Lennart Poettering <mzxreary at 0pointer dot de>, Arnd Bergmann <arnd at arndb dot de>, "Theodore Y. Ts'o" <tytso at mit dot edu>, Linus Torvalds <torvalds at linux-foundation dot org>, Linux Kernel Mailing List <linux-kernel at vger dot kernel dot org>, John Stultz <john dot stultz at linaro dot org>, Stephen Boyd <sboyd at kernel dot org>, Florian Weimer <fweimer at redhat dot com>, "H. Peter Anvin" <hpa at zytor dot com>, Palmer Dabbelt <palmer at dabbelt dot com>, Alistair Francis <alistair dot francis at wdc dot com>, GNU C Library <libc-alpha at sourceware dot org>, OGAWA Hirofumi <hirofumi at mail dot parknet dot co dot jp>
- Date: Mon, 19 Aug 2019 15:49:24 +0200 (CEST)
- Subject: Re: New kernel interface for sys_tz and timewarp?
- References: <CAK8P3a0VxM1BkjY1D2FfHi6L-ho_NH3v3+gBu45EfpjLF5NU5w@mail.gmail.com> <CAHk-=wiO2CWONDBud4nxoPgUJN1JEewFWhHa5wAqY8G5rrTXRQ@mail.gmail.com> <20190814000622.GB20365@mit.edu> <CAK8P3a1CXRETxn6Gh_cOxM3rZ-wUwVDu-7=yEwjqOY=uEdC6OQ@mail.gmail.com> <20190814090936.GB10516@gardel-login> <20190814093208.GG3600@piout.net> <20190819110903.if3dzhvfnlqutn6s@ws.net.home> <alpine.DEB.2.21.1908191541340.2147@nanos.tec.linutronix.de>
On Mon, 19 Aug 2019, Thomas Gleixner wrote:
> On Mon, 19 Aug 2019, Karel Zak wrote:
> > On Wed, Aug 14, 2019 at 11:32:08AM +0200, Alexandre Belloni wrote:
> > > On 14/08/2019 11:09:36+0200, Lennart Poettering wrote:
> > > > On Mi, 14.08.19 10:31, Arnd Bergmann (arnd@arndb.de) wrote:
> > > >
> > > > > - glibc stops passing the caller timezone argument to the kernel
> > > > > - the distro kernel disables CONFIG_RTC_HCTOSYS,
> > > > > CONFIG_RTC_SYSTOHC and CONFIG_GENERIC_CMOS_UPDATE
> > > >
> > > > What's the benefit of letting userspace do this? It sounds a lot more
> > > > fragile to leave this syncing to userspace if the kernel can do this
> > > > trivially on its own.
> >
> > Good point, why CONFIG_RTC_SYSTOHC has been added to the kernel?
>
> 023f333a99ce ("NTP: Add a CONFIG_RTC_SYSTOHC configuration")
Just for the record. Not a single defconfig enables, but it's selected by
SPARC for whatever reason.
Thanks,
tglx