how to define variables in the c file of kernel

riquelme · 05-15-2004, 07:08 AM

I want to write a system call to examine the frequecy of the page fault, so I defined two external variables to count, but that can't pass the make bzImage. I don't know why.

I'm a fresh man, and want to learn more about the linux kernel.

Thanks!

llama_meme · 05-15-2004, 07:57 AM

You'll need to give us a detailed description of what you're doing and post the relavent piece of code. Good luck

Alex

riquelme · 05-16-2004, 07:42 PM

Thank you!
I defined the two external variables in linux/mm.h(2.4.22),they are fault_pages and mapped _pages.
And I used the former in do_page_fault() and the later in do_mmap() to count.
Then I wanted to use them in my system call in asm/i386/mm/fault.c, so I hadn't written code except for the two defining, which is the cause of the errors after implementing "make bzImage" .
I can't define external variables in the kernel file as I do in ordinary C program, can I?

Thank you!