Linux Kernel - Adding field to task_struct

Posted by Drex on Stack Overflow See other posts from Stack Overflow or by Drex
Published on 2010-04-23T03:59:54Z Indexed on 2010/04/23 4:03 UTC
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kernel

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linux-kernel

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kernel-module

I'm playing around with the linux kernel and added a struct field to the task_struct in sched.h. I know that can be costly but my struct is very small.

I then initialize the new struct in INIT_TASK() and also re-initialize in fork.c copy_process() function so that when the INIT task or any other task creates a new process the process gets the init values.

What then happens is when I try to run the kernel I get a SEGFAULT.

The gdb error is:

Locating the bottom of the address space ... Program received signal SIGSEGV, Segmentation fault. 0x08066ad7 in page_ok (page=) at arch/um/os-Linux/sys-i386/task_size.c:31

31 n = *address;

It looks like it fails out in task_size. Is there anything else I need to do to add a field to task_struct?

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