linux-kernel - Re: New kernel interface for sys

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Message-ID: <alpine.DEB.2.21.1908191541340.2147@nanos.tec.linutronix.de>
Date:   Mon, 19 Aug 2019 15:43:03 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Karel Zak <kzak@...hat.com>
cc:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Lennart Poettering <mzxreary@...inter.de>,
        Arnd Bergmann <arnd@...db.de>,
        "Theodore Y. Ts'o" <tytso@....edu>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        John Stultz <john.stultz@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Florian Weimer <fweimer@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Alistair Francis <alistair.francis@....com>,
        GNU C Library <libc-alpha@...rceware.org>,
        OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Subject: Re: New kernel interface for sys_tz and timewarp?

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@...db.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")