linux-kernel - [RFC PATCH 01/12] x86: export set_memory_ro and set_memory

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Message-ID: <20080930031922.22950.84239.stgit@jbrandeb-bw.jf.intel.com>
Date:	Mon, 29 Sep 2008 20:19:22 -0700
From:	Jesse Brandeburg <jesse.brandeburg@...el.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-netdev@...r.kernel.org, kkeil@...e.de, agospoda@...hat.com,
	arjan@...ux.intel.com, david.graham@...el.com,
	bruce.w.allan@...el.com, jkosina@...e.cz, john.ronciak@...el.com,
	tglx@...utronix.de, chris.jones@...onical.com,
	tim.gardner@...el.com, airlied@...il.com,
	Bruce Allan <bruce.w.allan@...el.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: [RFC PATCH 01/12] x86: export set_memory_ro and set_memory_rw

From: Bruce Allan <bruce.w.allan@...el.com>

Export set_memory_ro() and set_memory_rw() calls for use by drivers that need
to have more debug information about who might be writing to memory space.
this was initially developed for use while debugging a memory corruption
problem with e1000e.

Ingo Molnar <mingo@...e.hu> said:
>> +EXPORT_SYMBOL(set_memory_rw);
> that's fine, as long as you make it kernel-internal EXPORT_SYMBOL_GPL()

patch was modified with this suggestion.

Signed-off-by: Bruce Allan <bruce.w.allan@...el.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
Acked-by: Ingo Molnar <mingo@...e.hu>
---

 arch/x86/mm/pageattr.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 43e2f84..62c1eef 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -906,11 +906,13 @@ int set_memory_ro(unsigned long addr, int numpages)
 {
 	return change_page_attr_clear(addr, numpages, __pgprot(_PAGE_RW));
 }
+EXPORT_SYMBOL_GPL(set_memory_ro);
 
 int set_memory_rw(unsigned long addr, int numpages)
 {
 	return change_page_attr_set(addr, numpages, __pgprot(_PAGE_RW));
 }
+EXPORT_SYMBOL_GPL(set_memory_rw);
 
 int set_memory_np(unsigned long addr, int numpages)
 {

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