Kernel eats argument=

Kernel eats argument=

[Nico Schottelius]

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Hello!

I wanted to have 'cprofile=a_profile" specified to my init
system. Now after some hours of debugging I see that
everything that is in the form of
   
      bla=blub

is eaten by the kernel and _not_ given to init.
Is that how it should be or is that a bug?

If it's how it should be, I'll switch to "cprofile:a_profile"
or will Linux eat that, too?

The most mysterious thing (for me) is that /proc/cmdline
contains that stuff again.


Nico, somehow confused

-- 
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Re: Kernel eats argument=

[Jan-Benedict Glaw]

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On Fri, 2005-06-17 16:36:42 +0200, Nico Schottelius <nico-kernel@schottelius.org> wrote:
> I wanted to have 'cprofile=a_profile" specified to my init
> system. Now after some hours of debugging I see that
> everything that is in the form of
>    
>       bla=blub
> 
> is eaten by the kernel and _not_ given to init.
> Is that how it should be or is that a bug?

Well, everything the kernel doesn't understand as a parameter (eg. for
modules) actually *is* passed to init, but not as command-line
arguments, but as environment variables. You'll probably find that :-)

MfG, JBG
PS: Not including sender's email address in Cc because I'm too lame to
ACK my email for his email system...

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Re: Kernel eats argument=

[Nico Schottelius]

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> [Does the kernel eat arguments?]

Found the answer myself: 

init/main.c:

/*
 * Unknown boot options get handed to init, unless they look like
 * failed parameters
 */
static int __init unknown_bootoption(char *param, char *val)

Yes, it does and I'll have to use a different string.

Have a nice day,

Nico


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Re: Kernel eats argument=

[Richard B. Johnson]

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On Fri, 17 Jun 2005, Nico Schottelius wrote:

> Hello!
>
> I wanted to have 'cprofile=a_profile" specified to my init
> system. Now after some hours of debugging I see that
> everything that is in the form of
>
>      bla=blub
>
> is eaten by the kernel and _not_ given to init.
> Is that how it should be or is that a bug?
>
> If it's how it should be, I'll switch to "cprofile:a_profile"
> or will Linux eat that, too?
>
> The most mysterious thing (for me) is that /proc/cmdline
> contains that stuff again.
>
>
> Nico, somehow confused

Init gets a single parameter 'auto'. Variables not understood
by the kernel get put into the environment....

\0OME=/\0TERM=linux\0SELINUX_INIT=YES\0
   |
   |______ maybe a bug, no "H".

Cheers,
Dick Johnson
Penguin : Linux version 2.6.11.9 on an i686 machine (5537.79 BogoMips).
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