linux-kernel - [PATCH 07/11] x86/xip: make e820_add_kernel

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Date:	Mon, 23 Mar 2015 00:46:36 -0700
From:	Jim Kukunas <james.t.kukunas@...ux.intel.com>
To:	Linux Kernel <linux-kernel@...r.kernel.org>,
	tom.zanussi@...ux.intel.com
Cc:	Arjan van de Ven <arjan@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>, tglx@...utronix.de,
	mingo@...hat.com, x86@...nel.org
Subject: [PATCH 07/11] x86/xip: make e820_add_kernel_range() a NOP

e820_add_kernel_range() checks whether the kernel text is present
in the e820 map, and marked as usable RAM. If not, it modifies
the e820 map accordingly.

For XIP, that is unnecessary since the kernel text won't be loaded
in RAM.

Signed-off-by: Jim Kukunas <james.t.kukunas@...ux.intel.com>
---
 arch/x86/kernel/setup.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index d276ebf..74fc6c8 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -787,6 +787,7 @@ static void __init trim_bios_range(void)
 }
 
 /* called before trim_bios_range() to spare extra sanitize */
+#ifndef CONFIG_XIP_KERNEL
 static void __init e820_add_kernel_range(void)
 {
 	u64 start = __pa_symbol(_text);
@@ -806,6 +807,11 @@ static void __init e820_add_kernel_range(void)
 	e820_remove_range(start, size, E820_RAM, 0);
 	e820_add_region(start, size, E820_RAM);
 }
+#else
+static void __init e820_add_kernel_range(void)
+{
+}
+#endif
 
 static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10;
 
-- 
2.1.0

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