From: Daniel Vetter <daniel@ffwll.ch>
To: Igor Matheus Andrade Torrente <igormtorrente@gmail.com>
Cc: Haneen Mohammed <hamohammed.sa@gmail.com>,
Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>,
David Airlie <airlied@linux.ie>,
linux-kernel <linux-kernel@vger.kernel.org>,
dri-devel <dri-devel@lists.freedesktop.org>,
Melissa Wen <melissa.srw@gmail.com>,
linux-next <linux-next@vger.kernel.org>,
Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Subject: Re: build failure of next-20220906 due to 396369d67549 ("drm: vkms: Add support to the RGB565 format")
Date: Wed, 7 Sep 2022 07:50:44 +0200 [thread overview]
Message-ID: <YxgxNPYl5LhKpHrk@phenom.ffwll.local> (raw)
In-Reply-To: <YxgwdGtNTnDdIqAv@phenom.ffwll.local>
On Wed, Sep 07, 2022 at 07:47:32AM +0200, Daniel Vetter wrote:
> On Tue, Sep 06, 2022 at 08:35:49PM -0300, Igor Matheus Andrade Torrente wrote:
> > On 9/6/22 18:26, Sudip Mukherjee wrote:
> > > On Tue, Sep 6, 2022 at 4:59 PM Sudip Mukherjee (Codethink)
> > > <sudipm.mukherjee@gmail.com> wrote:
> > > >
> > > > Hi All,
> > > >
> > > > The builds of next-20220906 fails for mips, xtensa and arm allmodconfig.
> > > >
> > > > The errors in mips and xtensa are:
> > > >
> > > > ERROR: modpost: "__divdi3" [drivers/gpu/drm/vkms/vkms.ko] undefined!
> > > > ERROR: modpost: "__udivdi3" [drivers/gpu/drm/vkms/vkms.ko] undefined!
> > > >
> > > > The error in arm is:
> > > >
> > > > ERROR: modpost: "__aeabi_uldivmod" [drivers/gpu/drm/vkms/vkms.ko] undefined!
> > > > ERROR: modpost: "__aeabi_ldivmod" [drivers/gpu/drm/vkms/vkms.ko] undefined!
> > > >
> > > >
> > > > Trying to do a git bisect to find out the offending commit.
> > >
> > > git bisect points to 396369d67549 ("drm: vkms: Add support to the
> > > RGB565 format")
> >
> > Are these architectures incapable of doing 64bits int division?
>
> Yeah 32bit archs in general can't do that, and you have to use the right
> macros because otherwise gcc falls back to its own built-ins, and those
> don't exist in the kernel since the kernel isn't (cannot!) linked against
> any userspace library.
>
> For pretty much this reasons it's really good to build test against 32bit
> x86, or probably more relevant these days, 32bit arm.
Forgot to add: include/math.h for all your division needs.
-Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
next prev parent reply other threads:[~2022-09-07 5:50 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-06 15:59 build failure of next-20220906 for vkms Sudip Mukherjee (Codethink)
2022-09-06 21:26 ` build failure of next-20220906 due to 396369d67549 ("drm: vkms: Add support to the RGB565 format") Sudip Mukherjee
2022-09-06 23:35 ` Igor Matheus Andrade Torrente
2022-09-07 5:47 ` Daniel Vetter
2022-09-07 5:50 ` Daniel Vetter [this message]
2022-09-07 17:04 ` Melissa Wen
2022-09-07 18:34 ` Sudip Mukherjee
2022-09-07 19:22 ` Melissa Wen
2022-09-07 20:07 ` Sudip Mukherjee
2022-09-09 11:43 ` Melissa Wen
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=YxgxNPYl5LhKpHrk@phenom.ffwll.local \
--to=daniel@ffwll.ch \
--cc=airlied@linux.ie \
--cc=dri-devel@lists.freedesktop.org \
--cc=hamohammed.sa@gmail.com \
--cc=igormtorrente@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-next@vger.kernel.org \
--cc=melissa.srw@gmail.com \
--cc=rodrigosiqueiramelo@gmail.com \
--cc=sudipm.mukherjee@gmail.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).