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For_each_process() were called many times by other function of linux kernel and tasklist is often modifed, so we need lock to protect the tasklist. Tasklist_lock is the special lock to protect tasklist in linux kernel.
Yes, I did, but it's need to EXPORT_SYMBOL(tasklist_lock). Here's why:
-What: remove EXPORT_SYMBOL(tasklist_lock)
-When: August 2006
-Files: kernel/fork.c
-Why: tasklist_lock protects the kernel internal task list. Modules have
no business looking at it, and all instances in drivers have been due
to use of too-lowlevel APIs. Having this symbol exported prevents
moving to more scalable locking schemes for the task list.
-Who: Christoph Hellwig hch@lst.de
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For_each_process() were called many times by other function of linux kernel and tasklist is often modifed, so we need lock to protect the tasklist. Tasklist_lock is the special lock to protect tasklist in linux kernel.