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Commit 6d35ab48 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Thomas Gleixner
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sched: Add 'flags' argument to sched_{set,get}attr() syscalls 



Because of a recent syscall design debate; its deemed appropriate for
each syscall to have a flags argument for future extension; without
immediately requiring new syscalls.

Cc: juri.lelli@gmail.com
Cc: Ingo Molnar <mingo@redhat.com>
Suggested-by: default avatarMichael Kerrisk <mtk.manpages@gmail.com>
Signed-off-by: default avatarPeter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20140214161929.GL27965@twins.programming.kicks-ass.net


Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 4efbc454

include/linux/syscalls.h

+4 −2
Original line number Diff line number Diff line
@@ -281,13 +281,15 @@ asmlinkage long sys_sched_setscheduler(pid_t pid, int policy, 
asmlinkage long sys_sched_setparam(pid_t pid,

					struct sched_param __user *param);

asmlinkage long sys_sched_setattr(pid_t pid,

					struct sched_attr __user *attr);

					struct sched_attr __user *attr,

					unsigned int flags);

asmlinkage long sys_sched_getscheduler(pid_t pid);

asmlinkage long sys_sched_getparam(pid_t pid,

					struct sched_param __user *param);

asmlinkage long sys_sched_getattr(pid_t pid,

					struct sched_attr __user *attr,

					unsigned int size);

					unsigned int size,

					unsigned int flags);

asmlinkage long sys_sched_setaffinity(pid_t pid, unsigned int len,

					unsigned long __user *user_mask_ptr);

asmlinkage long sys_sched_getaffinity(pid_t pid, unsigned int len,

kernel/sched/core.c

+6 −5
Original line number Diff line number Diff line
@@ -3661,13 +3661,14 @@ SYSCALL_DEFINE2(sched_setparam, pid_t, pid, struct sched_param __user *, param) 
 * @pid: the pid in question.

 * @uattr: structure containing the extended parameters.

 */

SYSCALL_DEFINE2(sched_setattr, pid_t, pid, struct sched_attr __user *, uattr)

SYSCALL_DEFINE3(sched_setattr, pid_t, pid, struct sched_attr __user *, uattr,

			       unsigned int, flags)

{

	struct sched_attr attr;

	struct task_struct *p;

	int retval;



	if (!uattr || pid < 0)

	if (!uattr || pid < 0 || flags)

		return -EINVAL;



	if (sched_copy_attr(uattr, &attr))
@@ -3804,8 +3805,8 @@ static int sched_read_attr(struct sched_attr __user *uattr, 
 * @uattr: structure containing the extended parameters.

 * @size: sizeof(attr) for fwd/bwd comp.

 */

SYSCALL_DEFINE3(sched_getattr, pid_t, pid, struct sched_attr __user *, uattr,

		unsigned int, size)

SYSCALL_DEFINE4(sched_getattr, pid_t, pid, struct sched_attr __user *, uattr,

		unsigned int, size, unsigned int, flags)

{

	struct sched_attr attr = {

		.size = sizeof(struct sched_attr),
@@ -3814,7 +3815,7 @@ SYSCALL_DEFINE3(sched_getattr, pid_t, pid, struct sched_attr __user *, uattr, 
	int retval;



	if (!uattr || pid < 0 || size > PAGE_SIZE ||

	    size < SCHED_ATTR_SIZE_VER0)

	    size < SCHED_ATTR_SIZE_VER0 || flags)

		return -EINVAL;



	rcu_read_lock();