linux-kernel - Re: MIPS: bug: gettimeofday syscall broken on CI20 board

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Message-ID: <4807842.gtHLO0kk0V@hyperion>
Date:   Thu, 28 Nov 2019 14:29:45 +0100
From:   Maarten ter Huurne <maarten@...ewalker.org>
To:     mips-creator-ci20-dev@...glegroups.com
Cc:     "H. Nikolaus Schaller" <hns@...delico.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>, linux-mips@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Discussions about the Letux Kernel 
        <letux-kernel@...nphoenux.org>
Subject: Re: MIPS: bug: gettimeofday syscall broken on CI20 board

On Thursday, 28 November 2019 13:33:17 CET H. Nikolaus Schaller wrote:
> Hi Vincenzo,
> 
> > Am 28.11.2019 um 13:21 schrieb Vincenzo Frascino
> > <vincenzo.frascino@....com>:> 
> > [...]
> > The the lib that provides the gettimeofday() changes accordingly
> > with vdso_data. 5.4 and 4.19 have 2 different vdso libraries as
> > well.
> 
> Yes, that is what I have assumed what happens. How do these libs go
> into an existing and working root-file-system with Debian Stretch?

I'm a novice when it comes to vDSO, so someone please correct me if I'm 
wrong.

>From what I read vDSO is a library in the sense that it exports ELF 
symbols that applications and other libraries (libc in particular) can 
use, but it is not a file on disk.

As such, which rootfs you use shouldn't matter, since the vDSO is not in 
the rootfs. Instead, it is contained in the kernel image. Searching for 
"linux-vdso.so.1" on packages.debian.org indeed returns no hits.

There is a check in arch/mips/vdso/Makefile that disables vDSO on MIPS 
when building the kernel with binutils < 2.25. I don't know if that is 
in any way related to this issue.

Bye,
		Maarten