linux-kernel - [tip:x86/mm] x86: make sure initmem is writable on 64-bit

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Date:	Tue, 3 Mar 2009 11:24:40 GMT
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	arjan@...ux.intel.com, penberg@...helsinki.fi, tglx@...utronix.de,
	mingo@...e.hu
Subject: [tip:x86/mm] x86: make sure initmem is writable on 64-bit

Commit-ID:  e087edd8c056292191bb989baf49f83ee509e624
Gitweb:     http://git.kernel.org/tip/e087edd8c056292191bb989baf49f83ee509e624
Author:     "Pekka Enberg" <penberg@...helsinki.fi>
AuthorDate: Tue, 3 Mar 2009 13:15:04 +0200
Commit:     Ingo Molnar <mingo@...e.hu>
CommitDate: Tue, 3 Mar 2009 12:21:18 +0100

x86: make sure initmem is writable on 64-bit

Impact: unification

This patch ports commit 3c1df68b848b39270752ff8d4b956cc4a4dce0f6 ("x86: make
sure initmem is writable") to the 64-bit version to unify implementations of
free_init_pages().

Signed-off-by: Pekka Enberg <penberg@...helsinki.fi>
Cc: Arjan van de Ven <arjan@...ux.intel.com>
LKML-Reference: <1236078904.2675.17.camel@...berg-laptop>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 arch/x86/mm/init_64.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index e6d36b4..03da903 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -962,6 +962,13 @@ void free_init_pages(char *what, unsigned long begin, unsigned long end)
 		begin, PAGE_ALIGN(end));
 	set_memory_np(begin, (end - begin) >> PAGE_SHIFT);
 #else
+	/*
+	 * We just marked the kernel text read only above, now that
+	 * we are going to free part of that, we need to make that
+	 * writeable first.
+	 */
+	set_memory_rw(begin, (end - begin) >> PAGE_SHIFT);
+
 	printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
 
 	for (; addr < end; addr += PAGE_SIZE) {
--
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