Re: BUG: null pointer deref in dmar_ir

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* Re: BUG: null pointer deref in dmar_ir_support
       [not found]   ` <4BB395B0.6090007@kielnet.net>
@ 2010-04-01  1:04     ` Suresh Siddha
  2010-04-01 18:20       ` Jan.Grossmann
                         ` (2 more replies)
  0 siblings, 3 replies; 8+ messages in thread
From: Suresh Siddha @ 2010-04-01  1:04 UTC (permalink / raw)
  To: Jan.Grossmann
  Cc: linux-pci, jbarnes, Woodhouse, David, mingo, Han, Weidong, Song,
	Youquan, LKML, H. Peter Anvin, x86, stable

[Problem is in the x86 portion of the code, so copying x86 folks for
their attention]

On Wed, 2010-03-31 at 11:34 -0700, Jan.Grossmann@kielnet.net wrote:
> >> [    0.144012] BUG: unable to handle kernel NULL pointer dereference at 
> >> 0000000000000025
> >> [    0.148000] IP: [<ffffffff81199c96>] dmar_ir_support+0xb/0x14
> >> [    0.148000] PGD 0
> >> [    0.148000] Oops: 0000 [#1] SMP
> >> [    0.148000] last sysfs file:
> >> [    0.148000] CPU 0
> >> [    0.148000] Modules linked in:
> >> [    0.148000]
> >> [    0.148000] Pid: 1, comm: swapper Not tainted 2.6.34-rc2 #4 A8N-SLI 
> >> Premium/System Product Name
> >> [    0.148000] RIP: 0010:[<ffffffff81199c96>]  [<ffffffff81199c96>] 
> >> dmar_ir_support+0xb/0x14
> >> [    0.148000] RSP: 0018:ffff88007fbe3e30  EFLAGS: 00010046
> >> [    0.148000] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 
> >> 000000000000004c
> >> [    0.148000] RDX: ffffffff81762338 RSI: 0000000000000046 RDI: 
> >> 0000000000000010
> >> [    0.148000] RBP: ffff88007fbe3e30 R08: 0000000000000002 R09: 
> >> 000000000000000a
> >> [    0.148000] R10: 0000000000000005 R11: 0000000000000000 R12: 
> >> 0000000000000010
> >> [    0.148000] R13: 0000000000000246 R14: 0000000000000000 R15: 
> >> 000000000000e850
> >> [    0.148000] FS:  0000000000000000(0000) GS:ffff880001a00000(0000) 
> >> knlGS:0000000000000000
> >> [    0.148000] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> >> [    0.148000] CR2: 0000000000000025 CR3: 0000000001625000 CR4: 
> >> 00000000000006f0
> >> [    0.148000] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
> >> 0000000000000000
> >> [    0.148000] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 
> >> 0000000000000400
> >> [    0.148000] Process swapper (pid: 1, threadinfo ffff88007fbe2000, 
> >> task ffff88007fbde740)
> >> [    0.148000] Stack:
> >> [    0.148000]  ffff88007fbe3e40 ffffffff816d1f01 ffff88007fbe3e50 
> >> ffffffff816b7fa6
> >> [    0.148000] <0> ffff88007fbe3ea0 ffffffff816b8095 ffff88007fbe3ec0 
> >> ffffffff8130122e
> >> [    0.148000] <0> ffff880000000008 ffff88007fbe3ed0 ffffffff8168ec20 
> >> 0000000000000200
> >> [    0.148000] Call Trace:
> >> [    0.148000]  [<ffffffff816d1f01>] intr_remapping_supported+0x12/0x45
> >> [    0.148000]  [<ffffffff816b7fa6>] enable_IR+0x9/0x5d
> >> [    0.148000]  [<ffffffff816b8095>] enable_IR_x2apic+0x9b/0x1b6
> >> [    0.148000]  [<ffffffff8130122e>] ? printk+0x3c/0x3e
> >> [    0.148000]  [<ffffffff816b81f7>] APIC_init_uniprocessor+0x47/0x105
> >> [    0.148000]  [<ffffffff816b62cf>] native_smp_prepare_cpus+0x190/0x365
> >> [    0.148000]  [<ffffffff816ab5f5>] kernel_init+0x71/0x1f0
> >> [    0.148000]  [<ffffffff810097e4>] kernel_thread_helper+0x4/0x10
> >> [    0.148000]  [<ffffffff816ab584>] ? kernel_init+0x0/0x1f0
> >> [    0.148000]  [<ffffffff810097e0>] ? kernel_thread_helper+0x0/0x10
> >> [    0.148000] Code: ff c7 06 00 00 00 00 48 8b 04 fd 80 ba 42 81 eb 0d 
> >> c7 06 02 00 00 00 48 c7 c0 e8 30 4a 81 c9 c3 48 8b 05 0e 4c 56 00 55 48 
> >> 89 e5 <0f> b6 40 25 c9 83 e0 01 c3 55 48 89 e5 e8 7c 8f 16 00 c9 c3 55
> >> [    0.148000] RIP  [<ffffffff81199c96>] dmar_ir_support+0xb/0x14
> >> [    0.148000]  RSP <ffff88007fbe3e30>
> >> [    0.148000] CR2: 0000000000000025
> >>     

Jan, Problem is that your system doesn't have proper SMP tables and we
were doing enable_IR_x2apic() twice finally leading to this panic. Can
you please check if the appended patch fixes your issue? Thanks.
---

From: Suresh Siddha <suresh.b.siddha@intel.com>
Subject: x86: fix calling enable_IR_x2apic() twice with SMP kernel on !SMP boards

Jan Grossmann reported kernel boot panic while booting SMP kernel on his
system with a single core cpu. SMP kernels call enable_IR_x2apic() from
native_smp_prepare_cpus() and on platforms where the kernel doesn't
find SMP configuration we ended up again calling enable_IR_x2apic() from the
APIC_init_uniprocessor() call in the smp_sanity_check(). Thus leading to
kernel panic.

Don't call enable_IR_x2apic() and default_setup_apic_routing()
from APIC_init_uniprocessor() in CONFIG_SMP case.

Reported-by: Jan.Grossmann@kielnet.net
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: stable@kernel.org [2.6.32, 2.6.33]
---

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 00187f1..e5a4a1e 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -1640,8 +1640,10 @@ int __init APIC_init_uniprocessor(void)
 	}
 #endif
 
+#ifndef CONFIG_SMP
 	enable_IR_x2apic();
 	default_setup_apic_routing();
+#endif
 
 	verify_local_APIC();
 	connect_bsp_APIC();



^ permalink raw reply	[flat|nested] 8+ messages in thread

* Re: BUG: null pointer deref in dmar_ir_support
  2010-04-01  1:04     ` BUG: null pointer deref in dmar_ir_support Suresh Siddha
@ 2010-04-01 18:20       ` Jan.Grossmann
  2010-04-01 20:04         ` Suresh Siddha
  2010-04-02 18:20       ` Ingo Molnar
  2010-04-02 19:14       ` [tip:x86/urgent] x86: Fix double enable_IR_x2apic() call on SMP kernel on !SMP boards tip-bot for Suresh Siddha
  2 siblings, 1 reply; 8+ messages in thread
From: Jan.Grossmann @ 2010-04-01 18:20 UTC (permalink / raw)
  To: linux-pci
  Cc: Suresh Siddha, jbarnes, Woodhouse, David, mingo, Han, Weidong,
	Song, Youquan, LKML, H. Peter Anvin, x86, stable

[-- Attachment #1: Type: text/plain, Size: 4983 bytes --]

Suresh Siddha wrote:
> [Problem is in the x86 portion of the code, so copying x86 folks for
> their attention]
>
> On Wed, 2010-03-31 at 11:34 -0700, Jan.Grossmann@kielnet.net wrote:
>   
>>>> [    0.144012] BUG: unable to handle kernel NULL pointer dereference at 
>>>> 0000000000000025
>>>> [    0.148000] IP: [<ffffffff81199c96>] dmar_ir_support+0xb/0x14
>>>> [    0.148000] PGD 0
>>>> [    0.148000] Oops: 0000 [#1] SMP
>>>> [    0.148000] last sysfs file:
>>>> [    0.148000] CPU 0
>>>> [    0.148000] Modules linked in:
>>>> [    0.148000]
>>>> [    0.148000] Pid: 1, comm: swapper Not tainted 2.6.34-rc2 #4 A8N-SLI 
>>>> Premium/System Product Name
>>>> [    0.148000] RIP: 0010:[<ffffffff81199c96>]  [<ffffffff81199c96>] 
>>>> dmar_ir_support+0xb/0x14
>>>> [    0.148000] RSP: 0018:ffff88007fbe3e30  EFLAGS: 00010046
>>>> [    0.148000] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 
>>>> 000000000000004c
>>>> [    0.148000] RDX: ffffffff81762338 RSI: 0000000000000046 RDI: 
>>>> 0000000000000010
>>>> [    0.148000] RBP: ffff88007fbe3e30 R08: 0000000000000002 R09: 
>>>> 000000000000000a
>>>> [    0.148000] R10: 0000000000000005 R11: 0000000000000000 R12: 
>>>> 0000000000000010
>>>> [    0.148000] R13: 0000000000000246 R14: 0000000000000000 R15: 
>>>> 000000000000e850
>>>> [    0.148000] FS:  0000000000000000(0000) GS:ffff880001a00000(0000) 
>>>> knlGS:0000000000000000
>>>> [    0.148000] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
>>>> [    0.148000] CR2: 0000000000000025 CR3: 0000000001625000 CR4: 
>>>> 00000000000006f0
>>>> [    0.148000] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
>>>> 0000000000000000
>>>> [    0.148000] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 
>>>> 0000000000000400
>>>> [    0.148000] Process swapper (pid: 1, threadinfo ffff88007fbe2000, 
>>>> task ffff88007fbde740)
>>>> [    0.148000] Stack:
>>>> [    0.148000]  ffff88007fbe3e40 ffffffff816d1f01 ffff88007fbe3e50 
>>>> ffffffff816b7fa6
>>>> [    0.148000] <0> ffff88007fbe3ea0 ffffffff816b8095 ffff88007fbe3ec0 
>>>> ffffffff8130122e
>>>> [    0.148000] <0> ffff880000000008 ffff88007fbe3ed0 ffffffff8168ec20 
>>>> 0000000000000200
>>>> [    0.148000] Call Trace:
>>>> [    0.148000]  [<ffffffff816d1f01>] intr_remapping_supported+0x12/0x45
>>>> [    0.148000]  [<ffffffff816b7fa6>] enable_IR+0x9/0x5d
>>>> [    0.148000]  [<ffffffff816b8095>] enable_IR_x2apic+0x9b/0x1b6
>>>> [    0.148000]  [<ffffffff8130122e>] ? printk+0x3c/0x3e
>>>> [    0.148000]  [<ffffffff816b81f7>] APIC_init_uniprocessor+0x47/0x105
>>>> [    0.148000]  [<ffffffff816b62cf>] native_smp_prepare_cpus+0x190/0x365
>>>> [    0.148000]  [<ffffffff816ab5f5>] kernel_init+0x71/0x1f0
>>>> [    0.148000]  [<ffffffff810097e4>] kernel_thread_helper+0x4/0x10
>>>> [    0.148000]  [<ffffffff816ab584>] ? kernel_init+0x0/0x1f0
>>>> [    0.148000]  [<ffffffff810097e0>] ? kernel_thread_helper+0x0/0x10
>>>> [    0.148000] Code: ff c7 06 00 00 00 00 48 8b 04 fd 80 ba 42 81 eb 0d 
>>>> c7 06 02 00 00 00 48 c7 c0 e8 30 4a 81 c9 c3 48 8b 05 0e 4c 56 00 55 48 
>>>> 89 e5 <0f> b6 40 25 c9 83 e0 01 c3 55 48 89 e5 e8 7c 8f 16 00 c9 c3 55
>>>> [    0.148000] RIP  [<ffffffff81199c96>] dmar_ir_support+0xb/0x14
>>>> [    0.148000]  RSP <ffff88007fbe3e30>
>>>> [    0.148000] CR2: 0000000000000025
>>>>     
>>>>         
>
> Jan, Problem is that your system doesn't have proper SMP tables and we
> were doing enable_IR_x2apic() twice finally leading to this panic. Can
> you please check if the appended patch fixes your issue? Thanks.
> ---
>
> From: Suresh Siddha <suresh.b.siddha@intel.com>
> Subject: x86: fix calling enable_IR_x2apic() twice with SMP kernel on !SMP boards
>
> Jan Grossmann reported kernel boot panic while booting SMP kernel on his
> system with a single core cpu. SMP kernels call enable_IR_x2apic() from
> native_smp_prepare_cpus() and on platforms where the kernel doesn't
> find SMP configuration we ended up again calling enable_IR_x2apic() from the
> APIC_init_uniprocessor() call in the smp_sanity_check(). Thus leading to
> kernel panic.
>
> Don't call enable_IR_x2apic() and default_setup_apic_routing()
> from APIC_init_uniprocessor() in CONFIG_SMP case.
>
> Reported-by: Jan.Grossmann@kielnet.net
> Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
> Cc: stable@kernel.org [2.6.32, 2.6.33]
> ---
>
> diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
> index 00187f1..e5a4a1e 100644
> --- a/arch/x86/kernel/apic/apic.c
> +++ b/arch/x86/kernel/apic/apic.c
> @@ -1640,8 +1640,10 @@ int __init APIC_init_uniprocessor(void)
>  	}
>  #endif
>  
> +#ifndef CONFIG_SMP
>  	enable_IR_x2apic();
>  	default_setup_apic_routing();
> +#endif
>  
>  	verify_local_APIC();
>  	connect_bsp_APIC();
>
>
>
>   
The patch seems to work,
but now my kernel won't find any IDE, SATA or USB drives anymore and 
then i end up with

Kernel panic - not syncing: VFS: Unable to mount root fs on 
unknown-block(0,0)

of course.
the full boot log is attached.
thanks
Jan

[-- Attachment #2: boot4.log --]
[-- Type: text/x-log, Size: 20510 bytes --]

[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Linux version 2.6.34-rc3 (root@masa-server) (gcc version 4.3.1 (Debian 4.3.1-9) ) #1 SMP Thu Apr 1 10:49:29 CEST 2010
[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-2.6.34-rc3 root=/dev/sda3 ro console=ttyS0,19200
[    0.000000] BIOS-provided physical RAM map:
[    0.000000]  BIOS-e820: 0000000000000000 - 000000000009f800 (usable)
[    0.000000]  BIOS-e820: 000000000009f800 - 00000000000a0000 (reserved)
[    0.000000]  BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
[    0.000000]  BIOS-e820: 0000000000100000 - 000000007fff0000 (usable)
[    0.000000]  BIOS-e820: 000000007fff0000 - 000000007fff3000 (ACPI NVS)
[    0.000000]  BIOS-e820: 000000007fff3000 - 0000000080000000 (ACPI data)
[    0.000000]  BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
[    0.000000]  BIOS-e820: 00000000fec00000 - 0000000100000000 (reserved)
[    0.000000] NX (Execute Disable) protection: active
[    0.000000] DMI 2.3 present.
[    0.000000] Phoenix BIOS detected: BIOS may corrupt low RAM, working around it.
[    0.000000] No AGP bridge found
[    0.000000] last_pfn = 0x7fff0 max_arch_pfn = 0x400000000
[    0.000000] x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
[    0.000000] init_memory_mapping: 0000000000000000-000000007fff0000
[    0.000000] ACPI: RSDP 00000000000f7c60 00014 (v00 Nvidia)
[    0.000000] ACPI: RSDT 000000007fff3040 00030 (v01 Nvidia AWRDACPI 42302E31 AWRD 00000000)
[    0.000000] ACPI: FACP 000000007fff30c0 00074 (v01 Nvidia AWRDACPI 42302E31 AWRD 00000000)
[    0.000000] ACPI: DSDT 000000007fff3180 06A16 (v01 NVIDIA AWRDACPI 00001000 MSFT 0100000E)
[    0.000000] ACPI: FACS 000000007fff0000 00040
[    0.000000] ACPI: SSDT 000000007fff9cc0 000D6 (v01 PTLTD  POWERNOW 00000001  LTP 00000001)
[    0.000000] ACPI: MCFG 000000007fff9e00 0003C (v01 Nvidia AWRDACPI 42302E31 AWRD 00000000)
[    0.000000] Scanning NUMA topology in Northbridge 24
[    0.000000] No NUMA configuration found
[    0.000000] Faking a node at 0000000000000000-000000007fff0000
[    0.000000] Initmem setup node 0 0000000000000000-000000007fff0000
[    0.000000]   NODE_DATA [0000000001580180 - 000000000158517f]
[    0.000000] Zone PFN ranges:
[    0.000000]   DMA      0x00000010 -> 0x00001000
[    0.000000]   DMA32    0x00001000 -> 0x00100000
[    0.000000]   Normal   empty
[    0.000000] Movable zone start PFN for each node
[    0.000000] early_node_map[2] active PFN ranges
[    0.000000]     0: 0x00000010 -> 0x0000009f
[    0.000000]     0: 0x00000100 -> 0x0007fff0
[    0.000000] Nvidia board detected. Ignoring ACPI timer override.
[    0.000000] If you got timer trouble try acpi_use_timer_override
[    0.000000] ACPI: PM-Timer IO Port: 0x4008
[    0.000000] SMP: Allowing 1 CPUs, 0 hotplug CPUs
[    0.000000] PM: Registered nosave memory: 000000000009f000 - 00000000000a0000
[    0.000000] PM: Registered nosave memory: 00000000000a0000 - 00000000000f0000
[    0.000000] PM: Registered nosave memory: 00000000000f0000 - 0000000000100000
[    0.000000] Allocating PCI resources starting at 80000000 (gap: 80000000:60000000)
[    0.000000] setup_percpu: NR_CPUS:512 nr_cpumask_bits:512 nr_cpu_ids:1 nr_node_ids:1
[    0.000000] PERCPU: Embedded 27 pages/cpu @ffff880001600000 s81192 r8192 d21208 u2097152
[    0.000000] pcpu-alloc: s81192 r8192 d21208 u2097152 alloc=1*2097152
[    0.000000] pcpu-alloc: [0] 0 
[    0.000000] Built 1 zonelists in Node order, mobility grouping on.  Total pages: 516991
[    0.000000] Policy zone: DMA32
[    0.000000] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-2.6.34-rc3 root=/dev/sda3 ro console=ttyS0,19200
[    0.000000] PID hash table entries: 4096 (order: 3, 32768 bytes)
[    0.000000] Checking aperture...
[    0.000000] No AGP bridge found
[    0.000000] Node 0: aperture @ 308000000 size 32 MB
[    0.000000] Aperture beyond 4GB. Ignoring.
[    0.000000] Subtract (37 early reservations)
[    0.000000]   #1 [0001000000 - 000157f244]   TEXT DATA BSS
[    0.000000]   #2 [000009f800 - 0000100000]   BIOS reserved
[    0.000000]   #3 [0001580000 - 000158015d]             BRK
[    0.000000]   #4 [0000010000 - 0000012000]      TRAMPOLINE
[    0.000000]   #5 [0000012000 - 0000016000]     ACPI WAKEUP
[    0.000000]   #6 [0000016000 - 0000018000]         PGTABLE
[    0.000000]   #7 [0001580180 - 0001585180]       NODE_DATA
[    0.000000]   #8 [0001585180 - 0001586180]         BOOTMEM
[    0.000000]   #9 [000157f280 - 000157f400]         BOOTMEM
[    0.000000]   #10 [0001d87000 - 0001d88000]         BOOTMEM
[    0.000000]   #11 [0001d88000 - 0001d89000]         BOOTMEM
[    0.000000]   #12 [0001e00000 - 0003a00000]        MEMMAP 0
[    0.000000]   #13 [000157f400 - 000157f580]         BOOTMEM
[    0.000000]   #14 [0001586180 - 0001592180]         BOOTMEM
[    0.000000]   #15 [0001593000 - 0001594000]         BOOTMEM
[    0.000000]   #16 [000157f580 - 000157f778]         BOOTMEM
[    0.000000]   #17 [000157f780 - 000157f7e8]         BOOTMEM
[    0.000000]   #18 [000157f800 - 000157f868]         BOOTMEM
[    0.000000]   #19 [000157f880 - 000157f8e8]         BOOTMEM
[    0.000000]   #20 [000157f900 - 000157f968]         BOOTMEM
[    0.000000]   #21 [000157f980 - 000157f9e8]         BOOTMEM
[    0.000000]   #22 [000157fa00 - 000157fa68]         BOOTMEM
[    0.000000]   #23 [000157fa80 - 000157fae8]         BOOTMEM
[    0.000000]   #24 [000157fb00 - 000157fb68]         BOOTMEM
[    0.000000]   #25 [000157fb80 - 000157fba0]         BOOTMEM
[    0.000000]   #26 [000157fbc0 - 000157fc0a]         BOOTMEM
[    0.000000]   #27 [000157fc40 - 000157fc8a]         BOOTMEM
[    0.000000]   #28 [0001600000 - 000161b000]         BOOTMEM
[    0.000000]   #29 [000157fcc0 - 000157fcc8]         BOOTMEM
[    0.000000]   #30 [000157fd00 - 000157fd08]         BOOTMEM
[    0.000000]   #31 [000157fd40 - 000157fd44]         BOOTMEM
[    0.000000]   #32 [000157fd80 - 000157fd88]         BOOTMEM
[    0.000000]   #33 [000157fdc0 - 000157ff10]         BOOTMEM
[    0.000000]   #34 [000157ff40 - 000157ffc0]         BOOTMEM
[    0.000000]   #35 [0001592180 - 0001592200]         BOOTMEM
[    0.000000]   #36 [0001594000 - 000159c000]         BOOTMEM
[    0.000000] Memory: 2062072k/2097088k available (2753k kernel code, 452k absent, 34564k reserved, 1497k data, 548k init)
[    0.000000] Hierarchical RCU implementation.
[    0.000000] NR_IRQS:33024 nr_irqs:256
[    0.000000] Console: colour VGA+ 80x25
[    0.000000] console [ttyS0] enabled
[    0.000000] Fast TSC calibration using PIT
[    0.000000] Detected 2010.419 MHz processor.
[    0.012005] Calibrating delay loop (skipped), value calculated using timer frequency.. 4020.83 BogoMIPS (lpj=8041676)
[    0.020139] Security Framework initialized
[    0.024006] SELinux:  Disabled at boot.
[    0.028187] Dentry cache hash table entries: 262144 (order: 9, 2097152 bytes)
[    0.033340] Inode-cache hash table entries: 131072 (order: 8, 1048576 bytes)
[    0.036692] Mount-cache hash table entries: 256
[    0.040172] Initializing cgroup subsys ns
[    0.044004] Initializing cgroup subsys cpuacct
[    0.048005] Initializing cgroup subsys devices
[    0.052002] Initializing cgroup subsys freezer
[    0.056003] Initializing cgroup subsys net_cls
[    0.060054] mce: CPU supports 5 MCE banks
[    0.064011] Performance Events: AMD PMU driver.
[    0.072003] ... version:                0
[    0.076001] ... bit width:              48
[    0.080001] ... generic registers:      4
[    0.084001] ... value mask:             0000ffffffffffff
[    0.088002] ... max period:             00007fffffffffff
[    0.092001] ... fixed-purpose events:   0
[    0.096001] ... event mask:             000000000000000f
[    0.100023] SMP alternatives: switching to UP code
[    0.109528] Freeing SMP alternatives: 28k freed
[    0.112012] ACPI: Core revision 20100121
[    0.125041] ACPI: setting ELCR to 0200 (from 0828)
[    0.129306] Setting APIC routing to flat
[    0.132003] weird, boot CPU (#0) not listed by the BIOS.
[    0.136001] SMP motherboard not detected.
[    0.144000] SMP disabled
[    0.144127] Brought up 1 CPUs
[    0.148003] Total of 1 processors activated (4020.83 BogoMIPS).
[    0.152649] regulator: core version 0.5
[    0.156097] NET: Registered protocol family 16
[    0.160308] TOM: 0000000080000000 aka 2048M
[    0.164036] ACPI: bus type pci registered
[    0.168127] PCI: MMCONFIG for domain 0000 [bus 00-ff] at [mem 0xe0000000-0xefffffff] (base 0xe0000000)
[    0.172017] PCI: MMCONFIG at [mem 0xe0000000-0xefffffff] reserved in E820
[    0.194294] PCI: Using configuration type 1 for base access
[    0.201218] bio: create slab <bio-0> at 0
[    0.213918] ACPI: Interpreter enabled
[    0.216004] ACPI: (supports S0 S1 S3 S4 S5)
[    0.228006] ACPI: Using PIC for interrupt routing
[    0.245638] ACPI: No dock devices found.
[    0.248035] PCI: Ignoring host bridge windows from ACPI; if necessary, use "pci=use_crs" and report a bug
[    0.252127] ACPI: PCI Root Bridge [PCI0] (0000:00)
[    0.256333] HPET not enabled in BIOS. You might try hpet=force boot option
[    0.260655] pci 0000:00:09.0: PCI bridge to [bus 05-05] (subtractive decode)
[    0.264044] pci 0000:00:0b.0: PCI bridge to [bus 04-04]
[    0.268031] pci 0000:00:0c.0: PCI bridge to [bus 03-03]
[    0.272031] pci 0000:00:0d.0: PCI bridge to [bus 02-02]
[    0.276090] pci 0000:00:0e.0: PCI bridge to [bus 01-01]
[    0.352743] ACPI: PCI Interrupt Link [LNK1] (IRQs 3 4 5 7 9 10 11 12 14 15) *0, disabled.
[    0.377242] ACPI: PCI Interrupt Link [LNK2] (IRQs *3 4 5 7 9 10 11 12 14 15)
[    0.397240] ACPI: PCI Interrupt Link [LNK3] (IRQs 3 4 5 7 9 10 *11 12 14 15)
[    0.416148] ACPI: PCI Interrupt Link [LNK4] (IRQs 3 4 5 7 9 10 11 12 14 15) *0, disabled.
[    0.441237] ACPI: PCI Interrupt Link [LNK5] (IRQs 3 4 5 7 9 10 11 12 14 15) *0, disabled.
[    0.468138] ACPI: PCI Interrupt Link [LUBA] (IRQs 3 4 5 7 9 10 11 12 14 15) *0, disabled.
[    0.493237] ACPI: PCI Interrupt Link [LUBB] (IRQs 3 4 5 7 9 10 11 12 14 15) *0, disabled.
[    0.517237] ACPI: PCI Interrupt Link [LMAC] (IRQs 3 4 5 7 9 10 11 12 14 15) *0, disabled.
[    0.541239] ACPI: PCI Interrupt Link [LACI] (IRQs 3 4 *5 7 9 10 11 12 14 15)
[    0.560148] ACPI: PCI Interrupt Link [LMCI] (IRQs 3 4 5 7 9 10 11 12 14 15) *0, disabled.
[    0.585239] ACPI: PCI Interrupt Link [LSMB] (IRQs 3 4 5 7 9 10 11 12 14 15) *0, disabled.
[    0.612148] ACPI: PCI Interrupt Link [LUB2] (IRQs 3 4 5 7 9 10 11 12 14 15) *0, disabled.
[    0.637237] ACPI: PCI Interrupt Link [LIDE] (IRQs 3 4 5 7 9 10 11 12 14 15) *0, disabled.
[    0.661247] ACPI: PCI Interrupt Link [LSID] (IRQs 3 4 5 7 9 10 *11 12 14 15)
[    0.681819] ACPI: PCI Interrupt Link [LFID] (IRQs 3 4 *5 7 9 10 11 12 14 15)
[    0.701246] ACPI: PCI Interrupt Link [LPCA] (IRQs 3 4 5 7 9 10 11 12 14 15) *0, disabled.
[    0.725262] ACPI: PCI Interrupt Link [APC1] (IRQs 16) *0, disabled.
[    0.737258] ACPI: PCI Interrupt Link [APC2] (IRQs 17) *0, disabled.
[    0.749258] ACPI: PCI Interrupt Link [APC3] (IRQs 18) *0, disabled.
[    0.761258] ACPI: PCI Interrupt Link [APC4] (IRQs 19) *0, disabled.
[    0.773196] ACPI: PCI Interrupt Link [APC5] (IRQs *16), disabled.
[    0.788173] ACPI: PCI Interrupt Link [APCF] (IRQs 20 21 22 23) *0, disabled.
[    0.805266] ACPI: PCI Interrupt Link [APCG] (IRQs 20 21 22 23) *0, disabled.
[    0.821265] ACPI: PCI Interrupt Link [APCH] (IRQs 20 21 22 23) *0, disabled.
[    0.840175] ACPI: PCI Interrupt Link [APCJ] (IRQs 20 21 22 23) *0, disabled.
[    0.861265] ACPI: PCI Interrupt Link [APCK] (IRQs 20 21 22 23) *0, disabled.
[    0.877265] ACPI: PCI Interrupt Link [APCS] (IRQs 20 21 22 23) *0, disabled.
[    0.896175] ACPI: PCI Interrupt Link [APCL] (IRQs 20 21 22 23) *0, disabled.
[    0.913265] ACPI: PCI Interrupt Link [APCZ] (IRQs 20 21 22 23) *0, disabled.
[    0.929274] ACPI: PCI Interrupt Link [APSI] (IRQs 20 21 22 23) *0, disabled.
[    0.945274] ACPI: PCI Interrupt Link [APSJ] (IRQs 20 21 22 23) *0, disabled.
[    0.964118] ACPI: PCI Interrupt Link [APCP] (IRQs 20 21 22 23) *0, disabled.
[    0.981280] vgaarb: device added: PCI:0000:01:00.0,decodes=io+mem,owns=io+mem,locks=none
[    0.984003] vgaarb: loaded
[    0.988080] usbcore: registered new interface driver usbfs
[    0.992066] usbcore: registered new interface driver hub
[    0.996044] usbcore: registered new device driver usb
[    1.000153] PCI: Using ACPI for IRQ routing
[    1.004022] pci 0000:00:02.1: address space collision: [mem 0xfeb00000-0xfeb000ff] conflicts with PCI Bus #00 [mem 0xfeb00000-0xfec0ffff]
[    1.008038] Expanded resource reserved due to conflict with PCI Bus #00
[    1.012165] Switching to clocksource tsc
[    1.017377] pnp: PnP ACPI init
[    1.035676] ACPI: bus type pnp registered
[    1.065425] pnp: PnP ACPI: found 15 devices
[    1.090500] ACPI: ACPI bus type pnp unregistered
[    1.118158] system 00:01: [io  0x4000-0x407f] has been reserved
[    1.153607] system 00:01: [io  0x4080-0x40ff] has been reserved
[    1.189018] system 00:01: [io  0x4400-0x447f] has been reserved
[    1.224429] system 00:01: [io  0x4480-0x44ff] has been reserved
[    1.259837] system 00:01: [io  0x4800-0x487f] has been reserved
[    1.295247] system 00:01: [io  0x4880-0x48ff] has been reserved
[    1.330661] system 00:02: [io  0x04d0-0x04d1] has been reserved
[    1.366067] system 00:02: [io  0x0800-0x087f] has been reserved
[    1.401477] system 00:02: [io  0x0290-0x0297] has been reserved
[    1.436893] system 00:0d: [mem 0xe0000000-0xefffffff] has been reserved
[    1.476459] system 00:0e: [mem 0x000d5000-0x000d7fff] has been reserved
[    1.516028] system 00:0e: [mem 0x000f0000-0x000f7fff] could not be reserved
[    1.557677] system 00:0e: [mem 0x000f8000-0x000fbfff] could not be reserved
[    1.599327] system 00:0e: [mem 0x000fc000-0x000fffff] could not be reserved
[    1.640975] system 00:0e: [mem 0x7fff0000-0x7fffffff] could not be reserved
[    1.682626] system 00:0e: [mem 0xffff0000-0xffffffff] has been reserved
[    1.722195] system 00:0e: [mem 0x00000000-0x0009ffff] could not be reserved
[    1.763846] system 00:0e: [mem 0x00100000-0x7ffeffff] could not be reserved
[    1.805494] system 00:0e: [mem 0xfec00000-0xfec00fff] has been reserved
[    1.845065] system 00:0e: [mem 0xfee00000-0xfeefffff] has been reserved
[    1.884633] system 00:0e: [mem 0xfefff000-0xfeffffff] has been reserved
[    1.924202] system 00:0e: [mem 0xfff80000-0xfff80fff] has been reserved
[    1.963773] system 00:0e: [mem 0xfff90000-0xfffbffff] has been reserved
[    2.003346] system 00:0e: [mem 0xfffed000-0xfffeffff] has been reserved
[    2.047840] pci 0000:00:02.1: BAR 0: assigned [mem 0x80000000-0x800000ff]
[    2.088464] pci 0000:00:02.1: BAR 0: set to [mem 0x80000000-0x800000ff] (PCI address [0x80000000-0x800000ff]
[    2.147271] pci 0000:00:09.0: PCI bridge to [bus 05-05]
[    2.178523] pci 0000:00:09.0:   bridge window [io  0xa000-0xafff]
[    2.214972] pci 0000:00:09.0:   bridge window [mem 0xd3000000-0xd4ffffff]
[    2.255580] pci 0000:00:09.0:   bridge window [mem pref disabled]
[    2.292031] pci 0000:00:0b.0: PCI bridge to [bus 04-04]
[    2.323278] pci 0000:00:0b.0:   bridge window [io  disabled]
[    2.357130] pci 0000:00:0b.0:   bridge window [mem disabled]
[    2.390980] pci 0000:00:0b.0:   bridge window [mem pref disabled]
[    2.427431] pci 0000:00:0c.0: PCI bridge to [bus 03-03]
[    2.458679] pci 0000:00:0c.0:   bridge window [io  disabled]
[    2.492530] pci 0000:00:0c.0:   bridge window [mem disabled]
[    2.526381] pci 0000:00:0c.0:   bridge window [mem pref disabled]
[    2.562831] pci 0000:00:0d.0: PCI bridge to [bus 02-02]
[    2.594078] pci 0000:00:0d.0:   bridge window [io  disabled]
[    2.627930] pci 0000:00:0d.0:   bridge window [mem disabled]
[    2.661781] pci 0000:00:0d.0:   bridge window [mem pref disabled]
[    2.698232] pci 0000:00:0e.0: PCI bridge to [bus 01-01]
[    2.729480] pci 0000:00:0e.0:   bridge window [io  0x9000-0x9fff]
[    2.765930] pci 0000:00:0e.0:   bridge window [mem 0xd0000000-0xd2ffffff]
[    2.806541] pci 0000:00:0e.0:   bridge window [mem 0xc0000000-0xcfffffff 64bit pref]
[    2.853009] NET: Registered protocol family 2
[    2.879198] IP route cache hash table entries: 65536 (order: 7, 524288 bytes)
[    2.922861] TCP established hash table entries: 262144 (order: 10, 4194304 bytes)
[    2.970234] TCP bind hash table entries: 65536 (order: 8, 1048576 bytes)
[    3.010990] TCP: Hash tables configured (established 262144 bind 65536)
[    3.050567] TCP reno registered
[    3.069345] UDP hash table entries: 1024 (order: 3, 32768 bytes)
[    3.105341] UDP-Lite hash table entries: 1024 (order: 3, 32768 bytes)
[    3.144041] NET: Registered protocol family 1
[    3.183061] pci 0000:00:00.0: Found enabled HT MSI Mapping
[    3.215915] pci 0000:00:0b.0: Found disabled HT MSI Mapping
[    3.249246] pci 0000:00:00.0: Found enabled HT MSI Mapping
[    3.282054] pci 0000:00:0b.0: Linking AER extended capability
[    3.316453] pci 0000:00:00.0: Found enabled HT MSI Mapping
[    3.349287] pci 0000:00:0c.0: Found disabled HT MSI Mapping
[    3.382619] pci 0000:00:00.0: Found enabled HT MSI Mapping
[    3.415424] pci 0000:00:0c.0: Linking AER extended capability
[    3.449830] pci 0000:00:00.0: Found enabled HT MSI Mapping
[    3.482659] pci 0000:00:0d.0: Found disabled HT MSI Mapping
[    3.515991] pci 0000:00:00.0: Found enabled HT MSI Mapping
[    3.548797] pci 0000:00:0d.0: Linking AER extended capability
[    3.583203] pci 0000:00:00.0: Found enabled HT MSI Mapping
[    3.616031] pci 0000:00:0e.0: Found disabled HT MSI Mapping
[    3.649364] pci 0000:00:00.0: Found enabled HT MSI Mapping
[    3.682169] pci 0000:00:0e.0: Linking AER extended capability
[    3.717399] audit: initializing netlink socket (disabled)
[    3.749731] type=2000 audit(1270145375.749:1): initialized
[    3.782751] HugeTLB registered 2 MB page size, pre-allocated 0 pages
[    3.821027] VFS: Disk quotas dquot_6.5.2
[    3.844540] Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
[    3.883157] msgmni has been set to 4027
[    3.906252] alg: No test for stdrng (krng)
[    3.930831] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 253)
[    3.975123] io scheduler noop registered
[    3.998570] io scheduler deadline registered
[    4.024124] io scheduler cfq registered (default)
[    4.056052] Linux agpgart interface v0.103
[    4.080615] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[    4.118458] serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
[    4.154782] 00:07: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
[    4.189941] brd: module loaded
[    4.208435] PNP: PS/2 Controller [PNP0303:PS2K,PNP0f13:PS2M] at 0x60,0x64 irq 1,12
[    4.256734] serio: i8042 KBD port at 0x60,0x64 irq 1
[    4.286432] serio: i8042 AUX port at 0x60,0x64 irq 12
[    4.316808] mice: PS/2 mouse device common for all mice
[    4.348152] rtc_cmos 00:04: RTC can wake from S4
[    4.375833] rtc_cmos 00:04: rtc core: registered rtc_cmos as rtc0
[    4.412338] rtc0: alarms up to one year, y3k, 242 bytes nvram
[    4.446772] cpuidle: using governor ladder
[    4.471289] cpuidle: using governor menu
[    4.494781] No iBFT detected.
[    4.512763] TCP cubic registered
[    4.532060] NET: Registered protocol family 17
[    4.558778] registered taskstats version 1
[    4.583502] rtc_cmos 00:04: setting system clock to 2010-04-01 18:09:43 UTC (1270145383)
[    4.646253] input: AT Translated Set 2 keyboard as /devices/platform/i8042/serio0/input/input0
[    4.702763] List of all partitions:
[    4.723621] No filesystem could mount root, tried: 
[    4.752839] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
[    4.802290] Pid: 1, comm: swapper Not tainted 2.6.34-rc3 #1
[    4.835620] Call Trace:
[    4.850238]  [<ffffffff812ac0e1>] ? panic+0x85/0xff
[    4.879405]  [<ffffffff810cadd9>] ? interleave_nodes+0x51/0x70
[    4.914293]  [<ffffffff8111ee85>] ? __bdevname+0x29/0x2e
[    4.946064]  [<ffffffff8143d17b>] ? mount_block_root+0x25e/0x275
[    4.981994]  [<ffffffff81002930>] ? ret_from_sys_call+0x0/0x5
[    5.016363]  [<ffffffff8143d344>] ? prepare_namespace+0x163/0x18d
[    5.052814]  [<ffffffff8143c6e7>] ? kernel_init+0x1d9/0x1e9
[    5.086143]  [<ffffffff810036d4>] ? kernel_thread_helper+0x4/0x10
[    5.122594]  [<ffffffff8143c50e>] ? kernel_init+0x0/0x1e9
[    5.154882]  [<ffffffff810036d0>] ? kernel_thread_helper+0x0/0x10


^ permalink raw reply	[flat|nested] 8+ messages in thread

* Re: BUG: null pointer deref in dmar_ir_support
  2010-04-01 18:20       ` Jan.Grossmann
@ 2010-04-01 20:04         ` Suresh Siddha
  2010-04-02 17:21           ` Suresh Siddha
  0 siblings, 1 reply; 8+ messages in thread
From: Suresh Siddha @ 2010-04-01 20:04 UTC (permalink / raw)
  To: Jan.Grossmann
  Cc: linux-pci, jbarnes, Woodhouse, David, mingo, Han, Weidong, Song,
	Youquan, LKML, H. Peter Anvin, x86, stable

On Thu, 2010-04-01 at 11:20 -0700, Jan.Grossmann@kielnet.net wrote:
> The patch seems to work,
> but now my kernel won't find any IDE, SATA or USB drives anymore and 
> then i end up with
> 
> Kernel panic - not syncing: VFS: Unable to mount root fs on 
> unknown-block(0,0)

hmm.. This sounds like a modules issue. Jan you were using modules in
your kernel config. You have initrd etc setup properly?

thanks,
suresh


^ permalink raw reply	[flat|nested] 8+ messages in thread

* Re: BUG: null pointer deref in dmar_ir_support
  2010-04-01 20:04         ` Suresh Siddha
@ 2010-04-02 17:21           ` Suresh Siddha
  0 siblings, 0 replies; 8+ messages in thread
From: Suresh Siddha @ 2010-04-02 17:21 UTC (permalink / raw)
  To: Jan.Grossmann
  Cc: linux-pci, jbarnes, Woodhouse, David, mingo, Han, Weidong, Song,
	Youquan, LKML, H. Peter Anvin, x86, stable, Thomas Gleixner

On Thu, 2010-04-01 at 13:04 -0700, Suresh Siddha wrote:
> On Thu, 2010-04-01 at 11:20 -0700, Jan.Grossmann@kielnet.net wrote:
> > The patch seems to work,
> > but now my kernel won't find any IDE, SATA or USB drives anymore and 
> > then i end up with
> > 
> > Kernel panic - not syncing: VFS: Unable to mount root fs on 
> > unknown-block(0,0)
> 
> hmm.. This sounds like a modules issue. Jan you were using modules in
> your kernel config. You have initrd etc setup properly?

Jan responded to me in private that this was indeed an initrd issue and
this patch is working fine to him.

Thomas/Peter/Ingo: please consider this patch for urgent tree.

thanks,
suresh


^ permalink raw reply	[flat|nested] 8+ messages in thread

* Re: BUG: null pointer deref in dmar_ir_support
  2010-04-01  1:04     ` BUG: null pointer deref in dmar_ir_support Suresh Siddha
  2010-04-01 18:20       ` Jan.Grossmann
@ 2010-04-02 18:20       ` Ingo Molnar
  2010-04-02 18:28         ` Suresh Siddha
  2010-04-02 19:14       ` [tip:x86/urgent] x86: Fix double enable_IR_x2apic() call on SMP kernel on !SMP boards tip-bot for Suresh Siddha
  2 siblings, 1 reply; 8+ messages in thread
From: Ingo Molnar @ 2010-04-02 18:20 UTC (permalink / raw)
  To: Suresh Siddha
  Cc: Jan.Grossmann, linux-pci, jbarnes, Woodhouse, David, Han,
	Weidong, Song, Youquan, LKML, H. Peter Anvin, x86, stable,
	Thomas Gleixner


* Suresh Siddha <suresh.b.siddha@intel.com> wrote:

> @@ -1640,8 +1640,10 @@ int __init APIC_init_uniprocessor(void)
>  	}
>  #endif
>  
> +#ifndef CONFIG_SMP
>  	enable_IR_x2apic();
>  	default_setup_apic_routing();
> +#endif

Instead of adding yet another ugly #ifdef please hide these details properly, 
by making enable_IR_x2apic() and default_setup_apic_routing() a NOP on !SMP.

Thanks,

	Ingo

^ permalink raw reply	[flat|nested] 8+ messages in thread

* Re: BUG: null pointer deref in dmar_ir_support
  2010-04-02 18:20       ` Ingo Molnar
@ 2010-04-02 18:28         ` Suresh Siddha
  2010-04-02 18:45           ` Ingo Molnar
  0 siblings, 1 reply; 8+ messages in thread
From: Suresh Siddha @ 2010-04-02 18:28 UTC (permalink / raw)
  To: Ingo Molnar
  Cc: Jan.Grossmann, linux-pci, jbarnes, Woodhouse, David, Han,
	Weidong, Song, Youquan, LKML, H. Peter Anvin, x86, stable,
	Thomas Gleixner

On Fri, 2010-04-02 at 11:20 -0700, Ingo Molnar wrote:
> * Suresh Siddha <suresh.b.siddha@intel.com> wrote:
> 
> > @@ -1640,8 +1640,10 @@ int __init APIC_init_uniprocessor(void)
> >  	}
> >  #endif
> >  
> > +#ifndef CONFIG_SMP
> >  	enable_IR_x2apic();
> >  	default_setup_apic_routing();
> > +#endif
> 
> Instead of adding yet another ugly #ifdef please hide these details properly, 
> by making enable_IR_x2apic() and default_setup_apic_routing() a NOP on !SMP.

Ingo, These are not nops on !SMP. We should call these functions from
APIC_init_uniprocessor() only if it is a UP kernel. For SMP kernel they
are called from some where else.

With the current code, on SMP and with non SMP motherboard we were
calling these routines twice which cause problem.

I wanted to keep the patch simple for urgent/backport. I will clean this
by restructuring the init code for 2.6.35

thanks,
suresh


^ permalink raw reply	[flat|nested] 8+ messages in thread

* Re: BUG: null pointer deref in dmar_ir_support
  2010-04-02 18:28         ` Suresh Siddha
@ 2010-04-02 18:45           ` Ingo Molnar
  0 siblings, 0 replies; 8+ messages in thread
From: Ingo Molnar @ 2010-04-02 18:45 UTC (permalink / raw)
  To: Suresh Siddha
  Cc: Jan.Grossmann, linux-pci, jbarnes, Woodhouse, David, Han,
	Weidong, Song, Youquan, LKML, H. Peter Anvin, x86, stable,
	Thomas Gleixner


* Suresh Siddha <suresh.b.siddha@intel.com> wrote:

> On Fri, 2010-04-02 at 11:20 -0700, Ingo Molnar wrote:
> > * Suresh Siddha <suresh.b.siddha@intel.com> wrote:
> > 
> > > @@ -1640,8 +1640,10 @@ int __init APIC_init_uniprocessor(void)
> > >  	}
> > >  #endif
> > >  
> > > +#ifndef CONFIG_SMP
> > >  	enable_IR_x2apic();
> > >  	default_setup_apic_routing();
> > > +#endif
> > 
> > Instead of adding yet another ugly #ifdef please hide these details 
> > properly, by making enable_IR_x2apic() and default_setup_apic_routing() a 
> > NOP on !SMP.
> 
> Ingo, These are not nops on !SMP. We should call these functions from 
> APIC_init_uniprocessor() only if it is a UP kernel. For SMP kernel they are 
> called from some where else.

Btw., that makes the cleanliness situation even worse ...

> With the current code, on SMP and with non SMP motherboard we were calling 
> these routines twice which cause problem.
> 
> I wanted to keep the patch simple for urgent/backport. I will clean this by 
> restructuring the init code for 2.6.35

Ok, fair enough, i'll queue up this fix.

The best structure would be to integrate these init details into the APIC 
driver methods and make UP-IOAPIC nothing particularly special.

Thanks,

	Ingo

^ permalink raw reply	[flat|nested] 8+ messages in thread

* [tip:x86/urgent] x86: Fix double enable_IR_x2apic() call on SMP kernel on !SMP boards
  2010-04-01  1:04     ` BUG: null pointer deref in dmar_ir_support Suresh Siddha
  2010-04-01 18:20       ` Jan.Grossmann
  2010-04-02 18:20       ` Ingo Molnar
@ 2010-04-02 19:14       ` tip-bot for Suresh Siddha
  2 siblings, 0 replies; 8+ messages in thread
From: tip-bot for Suresh Siddha @ 2010-04-02 19:14 UTC (permalink / raw)
  To: linux-tip-commits
  Cc: linux-kernel, hpa, mingo, weidong.han, youquan.song, jbarnes,
	david.woodhouse, suresh.b.siddha, Jan.Grossmann, tglx, mingo

Commit-ID:  472a474c6630efd195d3738339fd1bdc8aa3b1aa
Gitweb:     http://git.kernel.org/tip/472a474c6630efd195d3738339fd1bdc8aa3b1aa
Author:     Suresh Siddha <suresh.b.siddha@intel.com>
AuthorDate: Wed, 31 Mar 2010 18:04:47 -0700
Committer:  Ingo Molnar <mingo@elte.hu>
CommitDate: Fri, 2 Apr 2010 20:48:47 +0200

x86: Fix double enable_IR_x2apic() call on SMP kernel on !SMP boards

Jan Grossmann reported kernel boot panic while booting SMP
kernel on his system with a single core cpu. SMP kernels call
enable_IR_x2apic() from native_smp_prepare_cpus() and on
platforms where the kernel doesn't find SMP configuration we
ended up again calling enable_IR_x2apic() from the
APIC_init_uniprocessor() call in the smp_sanity_check(). Thus
leading to kernel panic.

Don't call enable_IR_x2apic() and default_setup_apic_routing()
from APIC_init_uniprocessor() in CONFIG_SMP case.

NOTE: this kind of non-idempotent and assymetric initialization
sequence is rather fragile and unclean, we'll clean that up
in v2.6.35. This is the minimal fix for v2.6.34.

Reported-by: Jan.Grossmann@kielnet.net
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: <jbarnes@virtuousgeek.org>
Cc: <david.woodhouse@intel.com>
Cc: <weidong.han@intel.com>
Cc: <youquan.song@intel.com>
Cc: <Jan.Grossmann@kielnet.net>
Cc: <stable@kernel.org> # [v2.6.32.x, v2.6.33.x]
LKML-Reference: <1270083887.7835.78.camel@sbs-t61.sc.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 arch/x86/kernel/apic/apic.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 00187f1..e5a4a1e 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -1640,8 +1640,10 @@ int __init APIC_init_uniprocessor(void)
 	}
 #endif
 
+#ifndef CONFIG_SMP
 	enable_IR_x2apic();
 	default_setup_apic_routing();
+#endif
 
 	verify_local_APIC();
 	connect_bsp_APIC();

^ permalink raw reply	[flat|nested] 8+ messages in thread

end of thread, other threads:[~2010-04-02 19:15 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
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     [not found] <4BAD1676.9090704@kielnet.net>
     [not found] ` <1270057394.2866.9.camel@sbs-t61.sc.intel.com>
     [not found]   ` <4BB395B0.6090007@kielnet.net>
2010-04-01  1:04     ` BUG: null pointer deref in dmar_ir_support Suresh Siddha
2010-04-01 18:20       ` Jan.Grossmann
2010-04-01 20:04         ` Suresh Siddha
2010-04-02 17:21           ` Suresh Siddha
2010-04-02 18:20       ` Ingo Molnar
2010-04-02 18:28         ` Suresh Siddha
2010-04-02 18:45           ` Ingo Molnar
2010-04-02 19:14       ` [tip:x86/urgent] x86: Fix double enable_IR_x2apic() call on SMP kernel on !SMP boards tip-bot for Suresh Siddha

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