linux-kernel - [tip:x86/urgent] x86, nx: Mark the ACPI resume trampoline code as +x

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Message-ID: <tip-d344e38b2c151ca5e5e39f562017127e93912528@git.kernel.org>
Date:	Mon, 7 Feb 2011 09:24:55 GMT
From:	"tip-bot for H. Peter Anvin" <hpa@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	castet.matthieu@...e.fr, suresh.b.siddha@...el.com, mhopf@...e.de,
	tglx@...utronix.de, mingo@...e.hu
Subject: [tip:x86/urgent] x86, nx: Mark the ACPI resume trampoline code as +x

Commit-ID:  d344e38b2c151ca5e5e39f562017127e93912528
Gitweb:     http://git.kernel.org/tip/d344e38b2c151ca5e5e39f562017127e93912528
Author:     H. Peter Anvin <hpa@...or.com>
AuthorDate: Sun, 6 Feb 2011 21:16:09 -0800
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Mon, 7 Feb 2011 09:07:13 +0100

x86, nx: Mark the ACPI resume trampoline code as +x

We reserve lowmem for the things that need it, like the ACPI
wakeup code, way early to guarantee availability.  This happens
before we set up the proper pagetables, so set_memory_x() has no
effect.

Until we have a better solution, use an initcall to mark the
wakeup code executable.

Originally-by: Matthieu Castet <castet.matthieu@...e.fr>
Signed-off-by: H. Peter Anvin <hpa@...or.com>
Cc: Matthias Hopf <mhopf@...e.de>
Cc: rjw@...k.pl
Cc: Suresh Siddha <suresh.b.siddha@...el.com>
LKML-Reference: <4D4F8019.2090104@...or.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/x86/kernel/acpi/sleep.c |   13 ++++++++++---
 1 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/acpi/sleep.c b/arch/x86/kernel/acpi/sleep.c
index 4d9ebba..68d1537 100644
--- a/arch/x86/kernel/acpi/sleep.c
+++ b/arch/x86/kernel/acpi/sleep.c
@@ -12,10 +12,8 @@
 #include <linux/cpumask.h>
 #include <asm/segment.h>
 #include <asm/desc.h>
-
-#ifdef CONFIG_X86_32
 #include <asm/pgtable.h>
-#endif
+#include <asm/cacheflush.h>
 
 #include "realmode/wakeup.h"
 #include "sleep.h"
@@ -149,6 +147,15 @@ void __init acpi_reserve_wakeup_memory(void)
 	memblock_x86_reserve_range(mem, mem + WAKEUP_SIZE, "ACPI WAKEUP");
 }
 
+int __init acpi_configure_wakeup_memory(void)
+{
+	if (acpi_realmode)
+		set_memory_x(acpi_realmode, WAKEUP_SIZE >> PAGE_SHIFT);
+
+	return 0;
+}
+arch_initcall(acpi_configure_wakeup_memory);
+
 
 static int __init acpi_sleep_setup(char *str)
 {
--
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