non-static init in a basic kernel module

non-static init in a basic kernel module

[Warren Turkal]

Hey,

I was writing a basic hello world module. I am using Ubuntu, so I 
installed linux-headers package that corresponded to my kernel. It's 
strange because all of the examples that I saw (including from modules 
in the kernel itself) show things like the following for the init function:

static int netcat_init(void)
{
     ...
     return 0;
}

module_init(netcat_init);

However, I was not able to get it to work with "static". My 
hello_world_init function looks like the following:

int __init hello_world_init(void)
{
     ...
     return 0;
}

module_init(hello_world_init);

The command that is used to make the kernel module is the one suggested 
in Documentation/kbuild/modules.txt. It looks like this:
make -C /lib/modules/`uname -r`/build M=$PWD

Does anyone know why the "static" version would not work?

Thanks,
wt

non-static init in a basic kernel module

[Greg KH]

On Mon, Jun 09, 2014 at 12:28:13AM -0700, Warren Turkal wrote:
> Hey,
> 
> I was writing a basic hello world module. I am using Ubuntu, so I 
> installed linux-headers package that corresponded to my kernel. It's 
> strange because all of the examples that I saw (including from modules 
> in the kernel itself) show things like the following for the init function:
> 
> static int netcat_init(void)
> {
>      ...
>      return 0;
> }
> 
> module_init(netcat_init);
> 
> However, I was not able to get it to work with "static". My 
> hello_world_init function looks like the following:
> 
> int __init hello_world_init(void)
> {
>      ...
>      return 0;
> }
> 
> module_init(hello_world_init);
> 
> The command that is used to make the kernel module is the one suggested 
> in Documentation/kbuild/modules.txt. It looks like this:
> make -C /lib/modules/`uname -r`/build M=$PWD
> 
> Does anyone know why the "static" version would not work?

What exactly were the errors you got?

non-static init in a basic kernel module

[sanjeev sharma]

Hi,

To prevent namespace pollution static is being used but this problem
is nothing to do with static and you should share Error Logs to know
exact problem also pointed by Greg.

Regards
Sanjeev Sharma


On Mon, Jun 9, 2014 at 12:58 PM, Warren Turkal <wt@penguintechs.org> wrote:
> Hey,
>
> I was writing a basic hello world module. I am using Ubuntu, so I
> installed linux-headers package that corresponded to my kernel. It's
> strange because all of the examples that I saw (including from modules
> in the kernel itself) show things like the following for the init function:
>
> static int netcat_init(void)
> {
>      ...
>      return 0;
> }
>
> module_init(netcat_init);
>
> However, I was not able to get it to work with "static". My
> hello_world_init function looks like the following:
>
> int __init hello_world_init(void)
> {
>      ...
>      return 0;
> }
>
> module_init(hello_world_init);
>
> The command that is used to make the kernel module is the one suggested
> in Documentation/kbuild/modules.txt. It looks like this:
> make -C /lib/modules/`uname -r`/build M=$PWD
>
> Does anyone know why the "static" version would not work?
>
> Thanks,
> wt
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies

non-static init in a basic kernel module

[Warren Turkal]

Hey,

I was writing a basic hello world module. I am using Ubuntu, so I 
installed linux-headers package that corresponded to my kernel. It's 
strange because all of the examples that I saw (including from modules 
in the kernel itself) show things like the following for the init function:

static int netcat_init(void)
{
     ...
     return 0;
}

module_init(netcat_init);

However, I was not able to get it to work with "static". My 
hello_world_init function looks like the following:

int __init hello_world_init(void)
{
     ...
     return 0;
}

module_init(hello_world_init);

The command that is used to make the kernel module is the one suggested 
in Documentation/kbuild/modules.txt. It looks like this:
make -C /lib/modules/`uname -r`/build M=$PWD

Does anyone know why the "static" version would not work?

Thanks,
wt

non-static init in a basic kernel module

[Pranay Srivastava]

On Jun 9, 2014 10:15 PM, "Warren Turkal" <wt@penguintechs.org> wrote:
>
> Hey,
>
> I was writing a basic hello world module. I am using Ubuntu, so I
> installed linux-headers package that corresponded to my kernel. It's
> strange because all of the examples that I saw (including from modules
> in the kernel itself) show things like the following for the init
function:
>
> static int netcat_init(void)
> {
>      ...
>      return 0;
> }
>
> module_init(netcat_init);
>
> However, I was not able to get it to work with "static". My
> hello_world_init function looks like the following:

can you post the error you got?

>
> int __init hello_world_init(void)
> {
>      ...
>      return 0;
> }
>
> module_init(hello_world_init);
>
> The command that is used to make the kernel module is the one suggested
> in Documentation/kbuild/modules.txt. It looks like this:
> make -C /lib/modules/`uname -r`/build M=$PWD
>
> Does anyone know why the "static" version would not work?
>
> Thanks,
> wt
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
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