Yes, current->mm points to user space context for the current process.
Now for a kernel threads there is no user space context and for them current->mm would be NULL.
Thanks,
Chetan Nanda
On Fri, Nov 15, 2013 at 9:54 PM, Paul Davies C <pauldaviesc@xxxxxxxxx> wrote:
Hi,
I happen to find this code snippet in the kernel source :
struct mm_struct *mm=current->mm;
/* some other code */
if(mm){ /*<==Why is this here? */
/*read the contents by locking*/
}
The if checks whether the mm_struct of the current process is NULL or not. That means the mm_struct of a process can become NULL. How can that happen?
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