linux-kernel - Re: acpi_ex_system_memory_space

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Date:	Thu, 27 Aug 2009 11:29:27 +0300
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	Lin Ming <ming.m.lin@...el.com>
Cc:	"Brown, Len" <len.brown@...el.com>,
	"Moore, Robert" <robert.moore@...el.com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: acpi_ex_system_memory_space_handler oops

On (08/27/09 15:59), Lin Ming wrote:
> > rc7-git5 (patched)
> > 
> > [    0.178628] ACPI: EC: Look up EC in DSDT
> > [    0.196480] ACPI: Interpreter enabled
> > [    0.196575] ACPI: (supports S0 S1 S3 S4 S5)
> > [    0.197184] ACPI: Using IOAPIC for interrupt routing
> > [    0.197352] PCI: MCFG configuration 0: base e0000000 segment 0 buses 0 - 255
> > [    0.203511] ACPI Error (dswload-0790): [PCFG] Namespace lookup failure, AE_ALREADY_EXISTS
> > [    0.203738] ACPI Exception: AE_ALREADY_EXISTS, During name lookup/catalog 20090521 psloop-227
> > [    0.203964] ACPI Error (psparse-0537): Method parse/execution failed [\_SB_.RBPE] (Node f7017678), AE_ALREADY_EXISTS
> > [    0.204256] ACPI: Marking method RBPE as Serialized because of AE_ALREADY_EXISTS error
> > [    0.204510] ACPI Error (psparse-0537): Method parse/execution failed [\_GPE._L01] (Node f701d198), AE_ALREADY_EXISTS
> > [    0.204803] ACPI: Marking method _L01 as Serialized because of AE_ALREADY_EXISTS error
> > [    0.205063] ACPI Exception: AE_ALREADY_EXISTS, while evaluating GPE method [_L01] 20090521 evgpe-568
> 
> Do you mean rc7-git5 sometime boot fails even with the patch applied?
>
No. Patched kernel boots ok. Even successfully booted kernel sometimes has the given lines in dmesg.
(I'll watch more.)
 
> > 
> > 
> > [...]
> > +		if (!(region_obj->region.node->flags & ANOBJ_TEMPORARY)) {
> > +			acpi_ex_exit_interpreter();
> > +		}
> > [...]
> > Does it explain successful boot with delay (vga=791, prink delay, etc.)?
> 
> Sorry, could you explain the question a bit more?
> 
Sorry,
We had successful boots with small delays (like vga=791, prinTk delays and so on) and oopses otherwise.

On (08/12/09 20:18), Len Brown wrote:
>The fact that boot_delay=10 makes the problem go away
>suggests some sort of race condition.  Is 10 the smallest
>value of printk_time that works, or is it a random value?
>


>Currently, we exit the interpreter when setup region, because it may
>execute control methods, such as _REG.
>
>The attached debug kernel patch (region-debug.patch) don't exit the
>interpreter if the region is temporary, namely, it is defined inside a
>method.
Ok, we don't exit in case of temporary region. How is it possible that we had 'normal' 
boots with delays? 


	Sergey
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