Disable EISA and probes

Disable EISA and probes

[Jeffrey Walton]

Hi Everyone,

I would like to disable EISA and its probes during boot. I found the
docs at https://www.kernel.org/doc/html/latest/driver-api/eisa.html,
but it does not discuss how to disable EISA or the probes.

I also found https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1543919,
where folks are wondering why EISA is enabled by default nowadays. And
one person asks about a kernel option to disable it (like I am doing).

I'd like to add a boot param like eisa=0 or eisa=off, but I suspect
it's not that easy. Looking at the three documented kernel parameters,
they all enable EISA and probes.

How do I disable EISA and the probes?

Thanks in advance.

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Re: Disable EISA and probes

[Greg KH]

On Fri, Sep 04, 2020 at 10:57:38PM -0400, Jeffrey Walton wrote:
> Hi Everyone,
> 
> I would like to disable EISA and its probes during boot. I found the
> docs at https://www.kernel.org/doc/html/latest/driver-api/eisa.html,
> but it does not discuss how to disable EISA or the probes.
> 
> I also found https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1543919,
> where folks are wondering why EISA is enabled by default nowadays. And
> one person asks about a kernel option to disable it (like I am doing).
> 
> I'd like to add a boot param like eisa=0 or eisa=off, but I suspect
> it's not that easy. Looking at the three documented kernel parameters,
> they all enable EISA and probes.
> 
> How do I disable EISA and the probes?

Build a kernel without EISA in it at all?  That's the simplest way as
you must have some custom hardware that doesn't like this, so a
custom-configuration seems like the best option.

Did you try that and it did not work?  What is the problem of EISA at
boot anyway?

thanks,

greg k-h

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Re: Disable EISA and probes

[Jeffrey Walton]

On Sat, Sep 5, 2020 at 2:15 AM Greg KH <greg@kroah.com> wrote:
>
> On Fri, Sep 04, 2020 at 10:57:38PM -0400, Jeffrey Walton wrote:
> > Hi Everyone,
> >
> > I would like to disable EISA and its probes during boot. I found the
> > docs at https://www.kernel.org/doc/html/latest/driver-api/eisa.html,
> > but it does not discuss how to disable EISA or the probes.
> >
> > I also found https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1543919,
> > where folks are wondering why EISA is enabled by default nowadays. And
> > one person asks about a kernel option to disable it (like I am doing).
> >
> > I'd like to add a boot param like eisa=0 or eisa=off, but I suspect
> > it's not that easy. Looking at the three documented kernel parameters,
> > they all enable EISA and probes.
> >
> > How do I disable EISA and the probes?
>
> Build a kernel without EISA in it at all?  That's the simplest way as
> you must have some custom hardware that doesn't like this, so a
> custom-configuration seems like the best option.

Nothing custom. I just have modern hardware.

What's the purpose of including EISA by default? It has not been used
in 25 years.

> Did you try that and it did not work?  What is the problem of EISA at
> boot anyway?

No, I did not build a custom kernel. I was looking for kernel options
to disable it.

The machine is part of a distro.

Jeff

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Re: Disable EISA and probes

[Greg KH]

On Sat, Sep 05, 2020 at 07:31:13AM -0400, Jeffrey Walton wrote:
> On Sat, Sep 5, 2020 at 2:15 AM Greg KH <greg@kroah.com> wrote:
> >
> > On Fri, Sep 04, 2020 at 10:57:38PM -0400, Jeffrey Walton wrote:
> > > Hi Everyone,
> > >
> > > I would like to disable EISA and its probes during boot. I found the
> > > docs at https://www.kernel.org/doc/html/latest/driver-api/eisa.html,
> > > but it does not discuss how to disable EISA or the probes.
> > >
> > > I also found https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1543919,
> > > where folks are wondering why EISA is enabled by default nowadays. And
> > > one person asks about a kernel option to disable it (like I am doing).
> > >
> > > I'd like to add a boot param like eisa=0 or eisa=off, but I suspect
> > > it's not that easy. Looking at the three documented kernel parameters,
> > > they all enable EISA and probes.
> > >
> > > How do I disable EISA and the probes?
> >
> > Build a kernel without EISA in it at all?  That's the simplest way as
> > you must have some custom hardware that doesn't like this, so a
> > custom-configuration seems like the best option.
> 
> Nothing custom. I just have modern hardware.
> 
> What's the purpose of including EISA by default? It has not been used
> in 25 years.

distro kernels have to support everything.  The kernel should still just
work just fine with it enabled but not present, right?

> > Did you try that and it did not work?  What is the problem of EISA at
> > boot anyway?
> 
> No, I did not build a custom kernel. I was looking for kernel options
> to disable it.

Again, why?  What is breaking because it is enabled in your kernel?

thanks,

greg k-h

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Re: Disable EISA and probes

[Jeffrey Walton]

On Sat, Sep 5, 2020 at 7:37 AM Greg KH <greg@kroah.com> wrote:
>
> On Sat, Sep 05, 2020 at 07:31:13AM -0400, Jeffrey Walton wrote:
> > On Sat, Sep 5, 2020 at 2:15 AM Greg KH <greg@kroah.com> wrote:
> > >
> > > On Fri, Sep 04, 2020 at 10:57:38PM -0400, Jeffrey Walton wrote:
> > > > Hi Everyone,
> > > >
> > > > I would like to disable EISA and its probes during boot. I found the
> > > > docs at https://www.kernel.org/doc/html/latest/driver-api/eisa.html,
> > > > but it does not discuss how to disable EISA or the probes.
> > > >
> > > > I also found https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1543919,
> > > > where folks are wondering why EISA is enabled by default nowadays. And
> > > > one person asks about a kernel option to disable it (like I am doing).
> > > >
> > > > I'd like to add a boot param like eisa=0 or eisa=off, but I suspect
> > > > it's not that easy. Looking at the three documented kernel parameters,
> > > > they all enable EISA and probes.
> > > >
> > > > How do I disable EISA and the probes?
> > >
> > > Build a kernel without EISA in it at all?  That's the simplest way as
> > > you must have some custom hardware that doesn't like this, so a
> > > custom-configuration seems like the best option.
> >
> > Nothing custom. I just have modern hardware.
> >
> > What's the purpose of including EISA by default? It has not been used
> > in 25 years.
>
> distro kernels have to support everything.  The kernel should still just
> work just fine with it enabled but not present, right?

Modern distros and their minimum requirements preclude EISA. One
cannot meet a distros minimum requirements and have EISA.

> > > Did you try that and it did not work?  What is the problem of EISA at
> > > boot anyway?
> >
> > No, I did not build a custom kernel. I was looking for kernel options
> > to disable it.
>
> Again, why?  What is breaking because it is enabled in your kernel?

Why do you assume something is broke?

Jeff

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Re: Disable EISA and probes

[Greg KH]

On Sat, Sep 05, 2020 at 09:17:43AM -0400, Jeffrey Walton wrote:
> On Sat, Sep 5, 2020 at 7:37 AM Greg KH <greg@kroah.com> wrote:
> >
> > On Sat, Sep 05, 2020 at 07:31:13AM -0400, Jeffrey Walton wrote:
> > > On Sat, Sep 5, 2020 at 2:15 AM Greg KH <greg@kroah.com> wrote:
> > > >
> > > > On Fri, Sep 04, 2020 at 10:57:38PM -0400, Jeffrey Walton wrote:
> > > > > Hi Everyone,
> > > > >
> > > > > I would like to disable EISA and its probes during boot. I found the
> > > > > docs at https://www.kernel.org/doc/html/latest/driver-api/eisa.html,
> > > > > but it does not discuss how to disable EISA or the probes.
> > > > >
> > > > > I also found https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1543919,
> > > > > where folks are wondering why EISA is enabled by default nowadays. And
> > > > > one person asks about a kernel option to disable it (like I am doing).
> > > > >
> > > > > I'd like to add a boot param like eisa=0 or eisa=off, but I suspect
> > > > > it's not that easy. Looking at the three documented kernel parameters,
> > > > > they all enable EISA and probes.
> > > > >
> > > > > How do I disable EISA and the probes?
> > > >
> > > > Build a kernel without EISA in it at all?  That's the simplest way as
> > > > you must have some custom hardware that doesn't like this, so a
> > > > custom-configuration seems like the best option.
> > >
> > > Nothing custom. I just have modern hardware.
> > >
> > > What's the purpose of including EISA by default? It has not been used
> > > in 25 years.
> >
> > distro kernels have to support everything.  The kernel should still just
> > work just fine with it enabled but not present, right?
> 
> Modern distros and their minimum requirements preclude EISA. One
> cannot meet a distros minimum requirements and have EISA.

Then file a bug with your distro to have it removed from their kernel
images.

> > > > Did you try that and it did not work?  What is the problem of EISA at
> > > > boot anyway?
> > >
> > > No, I did not build a custom kernel. I was looking for kernel options
> > > to disable it.
> >
> > Again, why?  What is breaking because it is enabled in your kernel?
> 
> Why do you assume something is broke?

Why would you want to disable it?  It's not running on your system, so
how can it affect you?

greg k-h

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Re: Disable EISA and probes

[Jeffrey Walton]

On Sat, Sep 5, 2020 at 10:52 AM Greg KH <greg@kroah.com> wrote:
>
> ...
> > > > > > I would like to disable EISA and its probes during boot. I found the
> > > > > > docs at https://www.kernel.org/doc/html/latest/driver-api/eisa.html,
> > > > > > but it does not discuss how to disable EISA or the probes.
> > > > > >
> > > > > > I also found https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1543919,
> > > > > > where folks are wondering why EISA is enabled by default nowadays. And
> > > > > > one person asks about a kernel option to disable it (like I am doing).
> > > > > >
> > > > > > I'd like to add a boot param like eisa=0 or eisa=off, but I suspect
> > > > > > it's not that easy. Looking at the three documented kernel parameters,
> > > > > > they all enable EISA and probes.
> > > > > >
> > > > > > How do I disable EISA and the probes?
> > > > >
> > > > > Build a kernel without EISA in it at all?  That's the simplest way as
> > > > > you must have some custom hardware that doesn't like this, so a
> > > > > custom-configuration seems like the best option.
> > > >
> > > > Nothing custom. I just have modern hardware.
> > > >
> > > > What's the purpose of including EISA by default? It has not been used
> > > > in 25 years.
> > >
> > > distro kernels have to support everything.  The kernel should still just
> > > work just fine with it enabled but not present, right?
> >
> > Modern distros and their minimum requirements preclude EISA. One
> > cannot meet a distros minimum requirements and have EISA.
>
> Then file a bug with your distro to have it removed from their kernel
> images.

Thanks.

So does that mean it is not possible to disable EISA and its probes?

Jeff

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Re: Disable EISA and probes

[Valdis Klētnieks]

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On Sat, 05 Sep 2020 11:11:27 -0400, Jeffrey Walton said:
> On Sat, Sep 5, 2020 at 10:52 AM Greg KH <greg@kroah.com> wrote:

> > > Modern distros and their minimum requirements preclude EISA. One
> > > cannot meet a distros minimum requirements and have EISA.
> >
> > Then file a bug with your distro to have it removed from their kernel
> > images.
>
> Thanks.
>
> So does that mean it is not possible to disable EISA and its probes?

16:18:21 0 [~] uname -a
Linux turing-police 5.9.0-rc2-next-20200827-dirty #779 SMP Sun Aug 30 04:22:57 EDT 2020 x86_64 x86_64 x86_64 GNU/Linux
16:19:38 0 [~] grep EISA /boot/config-`uname -r`
CONFIG_HAVE_EISA=y
# CONFIG_EISA is not set
16:19:55 0 [~]

It's possible, because I'm positive this laptop isn't about to suddenly sprout
an EISA bus that needs supporting. (That, and it's fun to watch a kernel build
blow up because I have an oddball .config for the build :)

Convincing a distro to remove it is a different question.  And I'm sure they
won't be interested in doing so unless you can prove "can't meet minimum
requirements and have EISA". Can you name-and-shame some distros, and
point at a minimum requirement that can't be met by a box that has EISA?



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