linux-kernel - [15/74] ACPI: Advertise to BIOS in _OSC: _OST on

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Message-Id: <20100204171455.992389734@linux.site>
Date:	Thu, 04 Feb 2010 09:11:46 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Zhao Yakui <yakui.zhao@...el.com>,
	Len Brown <len.brown@...el.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [15/74] ACPI: Advertise to BIOS in _OSC: _OST on _PPC changes

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Zhao Yakui <yakui.zhao@...el.com>

commit 6a4e2b7503d1f630bface040cf0f5a7aac1fabdb upstream.

If the BIOS pokes the system-wide OSC bits to see if Linux
supports evaluating _OST after a _PPC change notification,
answer yes.

Also, fix an oversight where we neglected to set the OSC
bit advertising processor aggregator device support
when acpi-pad is compiled as a module.

Signed-off-by: Zhao Yakui <yakui.zhao@...el.com>
Signed-off-by: Len Brown <len.brown@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/acpi/bus.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -490,9 +490,14 @@ static void acpi_bus_osc_support(void)
 
 	capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 	capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
-#ifdef CONFIG_ACPI_PROCESSOR_AGGREGATOR
+#if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
+			defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
 	capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
 #endif
+
+#if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
+	capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
+#endif
 	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 		return;
 	if (ACPI_SUCCESS(acpi_run_osc(handle, &context)))


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