sched: Make pushable_tasks CONFIG_SMP dependant
As noted by Peter Zijlstra at https://lkml.org/lkml/2010/11/10/391 (while reviewing other stuff, though), tracking pushable tasks only makes sense on SMP systems. Signed-off-by: Dario Faggioli <raistlin@linux.it> Acked-by: Steven Rostedt <rostedt@goodmis.org> Acked-by: Gregory Haskins <ghaskins@novell.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <1291143093.2697.298.camel@Palantir> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -12,6 +12,13 @@
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#include <linux/securebits.h>
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#include <net/net_namespace.h>
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#ifdef CONFIG_SMP
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# define INIT_PUSHABLE_TASKS(tsk) \
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.pushable_tasks = PLIST_NODE_INIT(tsk.pushable_tasks, MAX_PRIO),
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#else
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# define INIT_PUSHABLE_TASKS(tsk)
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#endif
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extern struct files_struct init_files;
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extern struct fs_struct init_fs;
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@ -137,7 +144,7 @@ extern struct cred init_cred;
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.nr_cpus_allowed = NR_CPUS, \
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}, \
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.tasks = LIST_HEAD_INIT(tsk.tasks), \
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.pushable_tasks = PLIST_NODE_INIT(tsk.pushable_tasks, MAX_PRIO), \
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INIT_PUSHABLE_TASKS(tsk) \
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.ptraced = LIST_HEAD_INIT(tsk.ptraced), \
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.ptrace_entry = LIST_HEAD_INIT(tsk.ptrace_entry), \
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.real_parent = &tsk, \
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@ -1240,7 +1240,9 @@ struct task_struct {
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#endif
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struct list_head tasks;
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#ifdef CONFIG_SMP
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struct plist_node pushable_tasks;
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#endif
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struct mm_struct *mm, *active_mm;
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#if defined(SPLIT_RSS_COUNTING)
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@ -2595,7 +2595,9 @@ void sched_fork(struct task_struct *p, int clone_flags)
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/* Want to start with kernel preemption disabled. */
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task_thread_info(p)->preempt_count = 1;
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#endif
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#ifdef CONFIG_SMP
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plist_node_init(&p->pushable_tasks, MAX_PRIO);
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#endif
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put_cpu();
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}
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