Commit f0100c7f authored by Davidlohr Bueso's avatar Davidlohr Bueso Committed by Thomas Bogendoerfer
Browse files

MIPS: Use rcu to lookup a task in mipsmt_sys_sched_setaffinity() 



The call simply looks up the corresponding task (without iterating
the tasklist), which is safe under rcu instead of the tasklist_lock.
In addition, the setaffinity counter part already does this.

Signed-off-by: default avatarDavidlohr Bueso <dbueso@suse.de>
Signed-off-by: default avatarThomas Bogendoerfer <tsbogend@alpha.franken.de>
parent a510b616

arch/mips/kernel/mips-mt-fpaff.c

+2 −2
Original line number Diff line number Diff line
@@ -167,7 +167,7 @@ asmlinkage long mipsmt_sys_sched_getaffinity(pid_t pid, unsigned int len, 
		return -EINVAL;



	get_online_cpus();

	read_lock(&tasklist_lock);

	rcu_read_lock();



	retval = -ESRCH;

	p = find_process_by_pid(pid);
@@ -181,7 +181,7 @@ asmlinkage long mipsmt_sys_sched_getaffinity(pid_t pid, unsigned int len, 
	cpumask_and(&mask, &allowed, cpu_active_mask);



out_unlock:

	read_unlock(&tasklist_lock);

	rcu_read_unlock();

	put_online_cpus();

	if (retval)

		return retval;