linux-kernel - [REGRESSION] x86: support for new UV apic

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Date:	Fri, 25 Apr 2008 07:43:20 +0300
From:	Priit Laes <plaes@...es.org>
To:	linux-kernel <linux-kernel@...r.kernel.org>,
	Jack Steiner <steiner@....com>
Cc:	Ingo Molnar <mingo@...e.hu>
Subject: [REGRESSION] x86: support for new UV apic

Hey,

I am getting two following warnings (probable one per each CPU core)
using the latest Linus's git:

WARNING: at arch/x86/kernel/genapic_64.c:86 read_apic_id+0x30/0x62()
Modules linked in:
Pid: 1, comm: swapper Not tainted 2.6.25-03563-gf7288b1 #20

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

---[ end trace ca143223eefdc828 ]---

Few hours of bisecting gave me following commit as a suspect


ac23d4ee3f84de33c16ed7e68f9adee2386e74fb is first bad commit
commit ac23d4ee3f84de33c16ed7e68f9adee2386e74fb
Author: Jack Steiner <steiner@....com>
Date:   Fri Mar 28 14:12:16 2008 -0500

    x86: support for new UV apic

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