Listing Supported Kernel Parameters?

Listing Supported Kernel Parameters?

[Henry C]

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Hi,

I am looking for a command (or alike) to list all the supported kernel
parameters based on my current kernel.

If such command doesn't exist, it would still be great to see a complete
list like this one:
https://www.kernel.org/doc/html/v4.15/admin-guide/kernel-parameters.html

But I can't find anything (reliable) for v3.10.

Thanks.

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Re: Listing Supported Kernel Parameters?

[Valentin Vidic]

On Mon, Dec 31, 2018 at 02:27:35PM +0800, Henry C wrote:
> I am looking for a command (or alike) to list all the supported kernel
> parameters based on my current kernel.
> 
> If such command doesn't exist, it would still be great to see a complete
> list like this one:
> https://www.kernel.org/doc/html/v4.15/admin-guide/kernel-parameters.html
> 
> But I can't find anything (reliable) for v3.10.

Not sure if there is a command for that but you can always grep for
^early_param in that version and get something like this:

early_param("debug", debug_kernel);
early_param("quiet", quiet_kernel);
early_param("loglevel", loglevel);
...

-- 
Valentin

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Re: Listing Supported Kernel Parameters?

[Henry C]

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Thanks.

I just downloaded the source here:
http://vault.centos.org/7.5.1804/os/Source/SPackages/kernel-3.10.0-862.el7.src.rpm

And to my surprise, I don't even see mce as a kernel parameter based on the
command you suggested:
$ grep -r "early_param" . | grep mce
$

So it seems like "early_param" only covers some kernel parameters but not
all.

Thanks for your suggestion tho!


On Mon, Dec 31, 2018 at 10:37 PM Valentin Vidic <Valentin.Vidic@carnet.hr>
wrote:

> On Mon, Dec 31, 2018 at 02:27:35PM +0800, Henry C wrote:
> > I am looking for a command (or alike) to list all the supported kernel
> > parameters based on my current kernel.
> >
> > If such command doesn't exist, it would still be great to see a complete
> > list like this one:
> > https://www.kernel.org/doc/html/v4.15/admin-guide/kernel-parameters.html
> >
> > But I can't find anything (reliable) for v3.10.
>
> Not sure if there is a command for that but you can always grep for
> ^early_param in that version and get something like this:
>
> early_param("debug", debug_kernel);
> early_param("quiet", quiet_kernel);
> early_param("loglevel", loglevel);
> ...
>
> --
> Valentin
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies@kernelnewbies.org
> https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>

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Re: Listing Supported Kernel Parameters?

[Valentin Vidic]

On Tue, Jan 01, 2019 at 12:48:58AM +0800, Henry C wrote:
> I just downloaded the source here:
> http://vault.centos.org/7.5.1804/os/Source/SPackages/kernel-3.10.0-862.el7.src.rpm
> 
> And to my surprise, I don't even see mce as a kernel parameter based on the
> command you suggested:
> $ grep -r "early_param" . | grep mce
> $
> 
> So it seems like "early_param" only covers some kernel parameters but not all.

Indeed, mce param seems to be defined using __setup:

__setup("mce", mcheck_enable);
__setup("nomce", mcheck_disable);

-- 
Valentin

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Re: Listing Supported Kernel Parameters?

[Henry C]

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Thanks for your direction!

Found what I want!

Appreicate!

On Tue, Jan 1, 2019 at 1:01 AM Valentin Vidic <Valentin.Vidic@carnet.hr>
wrote:

> On Tue, Jan 01, 2019 at 12:48:58AM +0800, Henry C wrote:
> > I just downloaded the source here:
> >
> http://vault.centos.org/7.5.1804/os/Source/SPackages/kernel-3.10.0-862.el7.src.rpm
> >
> > And to my surprise, I don't even see mce as a kernel parameter based on
> the
> > command you suggested:
> > $ grep -r "early_param" . | grep mce
> > $
> >
> > So it seems like "early_param" only covers some kernel parameters but
> not all.
>
> Indeed, mce param seems to be defined using __setup:
>
> __setup("mce", mcheck_enable);
> __setup("nomce", mcheck_disable);
>
> --
> Valentin
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies@kernelnewbies.org
> https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>

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