linux-kernel - [PATCH -v4] acpi: Handle ACPI0007 Device in acpi_early_set

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Date:	Fri, 17 Sep 2010 23:26:24 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	"Brown, Len" <len.brown@...el.com>
CC:	Bjorn Helgaas <bjorn.helgaas@...com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Lin Ming <ming.m.lin@...el.com>,
	Bob Moore <robert.moore@...el.com>
Subject: [PATCH -v4] acpi: Handle ACPI0007 Device in acpi_early_set_pdc

After
| commit d8191fa4a33fdc817277da4f2b7f771ff605a41c
| Author: Alex Chiang <achiang@...com>
| Date:   Mon Feb 22 12:11:39 2010 -0700
|
|    ACPI: processor: driver doesn't need to evaluate _PDC
|
|    Now that the early _PDC evaluation path knows how to correctly
|    evaluate _PDC on only physically present processors, there's no
|    need for the processor driver to evaluate it later when it loads.
|
|    To cover the hotplug case, push _PDC evaluation down into the
|    hotplug paths.

only cpu with Processor Statement get processed with _PDC

If bios is using Device object instead of Processor statement.
SSDTs for Pstate/Cstate/Tstate can not be loaded dynamically.

Need to try to scan ACPI0007 in addition to Processor.

That commit is between 2.6.34-rc1 and 2.6.34-rc2, so stable tree for 2.6.34+
need this patch.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>

---
 drivers/acpi/processor_core.c |    1 +
 1 file changed, 1 insertion(+)

Index: linux-2.6/drivers/acpi/processor_core.c
===================================================================
--- linux-2.6.orig/drivers/acpi/processor_core.c
+++ linux-2.6/drivers/acpi/processor_core.c
@@ -352,4 +352,5 @@ void __init acpi_early_processor_set_pdc
 	acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
 			    ACPI_UINT32_MAX,
 			    early_init_pdc, NULL, NULL, NULL);
+	acpi_get_devices("ACPI0007", early_init_pdc, NULL, NULL);
 }
--
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