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Altera_Forum
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20 years ago

problem with modules

I follow http://nioswiki.jot.com/wikihome/operating...duleprogarmming (http://nioswiki.jot.com/wikihome/operatingsystems/moduleprogarmming) but when I type in "modprobe hello" what I get is "modprobe...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
20 years ago

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originally posted by abg@Jul 21 2006, 02:16 AM

in my linux-2.6.x/mm/nommu.c file there seems not to be any do_mmap_private function... :-( anyway... is a little strange that the error could be in the nommu.c, isn't it? because if it were, it should fail to everybody... i think.

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The error isn&#39;t in nommu.c - its just where I worked around it. The error comes from the call to a file mmap via a function pointer, which then returns NULL.

Which version of the source are you using? If its a bit older, your do_mmap_private may be rolled up into do_mmap_pgoff (also in nommu.c)

Anyway, I believe the reason module loading is failing is because of the ramfs_nommu_mmap function being a stub (see linux-2.6.x/fs/ramfs/file-nommu.c)... 

int ramfs_nommu_mmap(struct file *file, struct vm_area_struct *vma)
{
    return 0;
}

Shouldn&#39;t this be setting vma->vm_start to something at least?

If your modules reside somewhere other than ramfs, everything seems to work OK. Try loading your modules from a filesystem on a CF card or something...

Mike