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authorHiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>2008-01-30 13:33:18 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-30 13:33:18 +0100
commit27415a4fe369e07a1393ae52c8ed8e48aabed5a9 (patch)
tree0988b70c690c8c674ce11e2cf857d00e10ead7a8 /arch/x86/kernel/process_64.c
parent2274c33ebdfbb848e7291849e662d36519b52bf4 (diff)
x86: move warning message of polling idle and HT enabled
The warning message at idle_setup() is never shown because smp_num_sibling hasn't been updated at this point yet. Move this polling idle and HT enabled warning to select_idle_routine(). I also implement this warning on 64-bit kernel. Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/kernel/process_64.c')
-rw-r--r--arch/x86/kernel/process_64.c17
1 files changed, 12 insertions, 5 deletions
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index dbe0a846ec5..95313532b2e 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -291,20 +291,27 @@ static int mwait_usable(const struct cpuinfo_x86 *c)
void __cpuinit select_idle_routine(const struct cpuinfo_x86 *c)
{
- static int printed;
+ static int selected;
+
+ if (selected)
+ return;
+#ifdef CONFIG_X86_SMP
+ if (pm_idle == poll_idle && smp_num_siblings > 1) {
+ printk(KERN_WARNING "WARNING: polling idle and HT enabled,"
+ " performance may degrade.\n");
+ }
+#endif
if (cpu_has(c, X86_FEATURE_MWAIT) && mwait_usable(c)) {
/*
* Skip, if setup has overridden idle.
* One CPU supports mwait => All CPUs supports mwait
*/
if (!pm_idle) {
- if (!printed) {
- printk(KERN_INFO "using mwait in idle threads.\n");
- printed = 1;
- }
+ printk(KERN_INFO "using mwait in idle threads.\n");
pm_idle = mwait_idle;
}
}
+ selected = 1;
}
static int __init idle_setup(char *str)