x86: disable preemption in native_smp_prepare_cpus
authorIngo Molnar <mingo@elte.hu>
Mon, 12 May 2008 13:44:38 +0000 (15:44 +0200)
committerThomas Gleixner <tglx@linutronix.de>
Wed, 4 Jun 2008 11:11:46 +0000 (13:11 +0200)
commitdeef325086c3897393b8f7d6bccd03405244fe18
treecca203a04bcb1d0f0786fe393f67cc38f042126c
parentfb3bbd6a663fe972611676381adc4c60ddfe61ac
x86: disable preemption in native_smp_prepare_cpus

Priit Laes reported the following warning:

Call Trace:
 [<ffffffff8022f1e1>] warn_on_slowpath+0x51/0x63
 [<ffffffff80282e48>] sys_ioctl+0x2d/0x5d
 [<ffffffff805185ff>] _spin_lock+0xe/0x24
 [<ffffffff80227459>] task_rq_lock+0x3d/0x73
 [<ffffffff805133c3>] set_cpu_sibling_map+0x336/0x350
 [<ffffffff8021c1b8>] read_apic_id+0x30/0x62
 [<ffffffff806d921d>] verify_local_APIC+0x90/0x138
 [<ffffffff806d84b5>] native_smp_prepare_cpus+0x1f9/0x305
 [<ffffffff806ce7b1>] kernel_init+0x59/0x2d9
 [<ffffffff80518a26>] _spin_unlock_irq+0x11/0x2b
 [<ffffffff8020bf48>] child_rip+0xa/0x12
 [<ffffffff806ce758>] kernel_init+0x0/0x2d9
 [<ffffffff8020bf3e>] child_rip+0x0/0x12

fix this by generally disabling preemption in native_smp_prepare_cpus().

Reported-and-bisected-by: Priit Laes <plaes@plaes.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
arch/x86/kernel/smpboot.c