linux-kernel - [PATCH V3 1/4] x86: acpi: define uncached page flag

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Date:	Thu, 11 Jun 2015 11:25:57 -0700
From:	"Jonathan (Zhixiong) Zhang" <zjzhang@...eaurora.org>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Matt Fleming <matt.fleming@...el.com>, fu.wei@...aro.org,
	al.stone@...aro.org, bp@...en8.de, tony.luck@...il.com,
	ying.huang@...el.com
Cc:	"Jonathan (Zhixiong) Zhang" <zjzhang@...eaurora.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH V3 1/4] x86: acpi: define uncached page flag

From: "Jonathan (Zhixiong) Zhang" <zjzhang@...eaurora.org>

This definition is used in APEI code when needing to map pages as
uncached.

Signed-off-by: Jonathan (Zhixiong) Zhang <zjzhang@...eaurora.org>
---
 arch/x86/include/asm/acpi.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/include/asm/acpi.h b/arch/x86/include/asm/acpi.h
index 3a45668f6dc3..6afb27682b00 100644
--- a/arch/x86/include/asm/acpi.h
+++ b/arch/x86/include/asm/acpi.h
@@ -138,6 +138,10 @@ static inline void disable_acpi(void) { }
 
 #endif /* !CONFIG_ACPI */
 
+#ifdef	CONFIG_ACPI_APEI
+#define ARCH_APEI_PAGE_KERNEL_UC (PAGE_KERNEL_NOCACHE)
+#endif /*CONFIG_ACPI_APEI */
+
 #define ARCH_HAS_POWER_INIT	1
 
 #ifdef CONFIG_ACPI_NUMA
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

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