Writing a System Call that Accesses a Kernel Variable -

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i have own kernel module has external integer variable:

extern int = 0;

i want write system call (in separate file) following i:

i = + 1;

however, because declared in kernel module file , not in system call, won't compile properly. know problem doesn't lie elsewhere because system call "works" fine when contains printk statement or self-contained. how can link variable in kernel module file system call file?


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