From: Anton Altaparmakov <aia21@cam.ac.uk>
Date: Thu, 25 Mar 2010 20:48:12 +0000 (+0000)
Subject: MIPS: Fix __vmalloc() etc. on MIPS for non-GPL modules
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=7b3e543ddb39b69b75c9c24bb54180eca152f541;p=openwrt%2Fstaging%2Fblogic.git

MIPS: Fix __vmalloc() etc. on MIPS for non-GPL modules

Commit b3594a089f1c17ff919f8f78505c3f20e1f6f8ce (lmo) rsp.
351336929ccf222ae38ff0cb7a8dd5fd5c6236a0 (kernel.org) break non-GPL modules
that use __vmalloc() or any of the vmap(), vm_map_ram(), etc functions on
MIPS.

All those functions are EXPORT_SYMBOL() so are meant to be allowed to be
used by non-GPL kernel modules.  These calls all take page protection as
an argument which is normally a constant like PAGE_KERNEL.

This commit causes all protection constants like PAGE_KERNEL to not be
constants and instead to contain the GPL-only symbol _page_cachable_default.

This means that all calls to __vmalloc(), vmap(), etc, cause non-GPL
modules to fail to link with the complaint that they are trying to use the
GPL-only symbol _page_cachable_default...

Change EXPORT_SYMBOL_GPL(_page_cachable_default) to EXPORT_SYMBOL() for
non-GPL modules that call __vmalloc(), vmap(), vm_map_ram() etc.

Signed-off-by: Anton Altaparmakov <aia21@cantab.net>
Cc: Chris Dearman <chris@mips.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: http://patchwork.linux-mips.org/patch/1084/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---

diff --git a/arch/mips/mm/cache.c b/arch/mips/mm/cache.c
index be8627bc5b02..12af739048fa 100644
--- a/arch/mips/mm/cache.c
+++ b/arch/mips/mm/cache.c
@@ -133,7 +133,7 @@ void __update_cache(struct vm_area_struct *vma, unsigned long address,
 }
 
 unsigned long _page_cachable_default;
-EXPORT_SYMBOL_GPL(_page_cachable_default);
+EXPORT_SYMBOL(_page_cachable_default);
 
 static inline void setup_protection_map(void)
 {