[PATCH] arm: mm: export set_memory_x and set_meory_nx

[PATCH] arm: mm: export set_memory_x and set_meory_nx

[Jungseung Lee]

This patch exports set_memory_x and set_memory_nx functions.
It is still allowed for modules to use these functions in other
architectures. In a similar manner to arm, export these functions.

Signed-off-by: Jungseung Lee <js07.lee@samsung.com>
---
 arch/arm/mm/pageattr.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/mm/pageattr.c b/arch/arm/mm/pageattr.c
index d19b1ad..abf6695 100644
--- a/arch/arm/mm/pageattr.c
+++ b/arch/arm/mm/pageattr.c
@@ -88,6 +88,7 @@ int set_memory_nx(unsigned long addr, int numpages)
 					__pgprot(L_PTE_XN),
 					__pgprot(0));
 }
+EXPORT_SYMBOL_GPL(set_memory_nx);
 
 int set_memory_x(unsigned long addr, int numpages)
 {
@@ -95,3 +96,4 @@ int set_memory_x(unsigned long addr, int numpages)
 					__pgprot(0),
 					__pgprot(L_PTE_XN));
 }
+EXPORT_SYMBOL_GPL(set_memory_x);
-- 
1.7.9.5

[PATCH] arm: mm: export set_memory_x and set_meory_nx

[Russell King - ARM Linux]

On Thu, Sep 01, 2016 at 06:45:25PM +0900, Jungseung Lee wrote:
> This patch exports set_memory_x and set_memory_nx functions.
> It is still allowed for modules to use these functions in other
> architectures. In a similar manner to arm, export these functions.

They don't work on general kernel memory, so I'd much prefer that these
weren't exported.

I see no users of set_memory_nx() in modules.  There's one module that
uses set_memory_x(), which is drivers/watchdog/hpwdt.c.  The three users
of that are ifdef'd for x86 cases, and it's used on the result of
ioremapping, which will fail on ARMs implementation (which only allows
modules memory.)

-- 
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