[patch 43/76] moduleparam: fix alpha, ia64 and ppc64 compile failures

[Chris Wright]

-stable review patch.  If anyone has any objections, please let us know.
---------------------

From: Ivan Kokshaysky <ink@xxxxxxxxxxxxxxxxxxxx>

[upstream commit: 91d35dd9]

On alpha, ia64 and ppc64 only relocations to local data can go into
read-only sections. The vast majority of module parameters use the global
generic param_set_*/param_get_* functions, so the 'const' attribute for
struct kernel_param is not only useless, but it also causes compile
failures due to 'section type conflict' in those rare cases where
param_set/get are local functions.

This fixes http://bugzilla.kernel.org/show_bug.cgi?id=8964

Signed-off-by: Ivan Kokshaysky <ink@xxxxxxxxxxxxxxxxxxxx>
Cc: Richard Henderson <rth@xxxxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Anton Blanchard <anton@xxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Adrian Bunk <bunk@xxxxxxxxx>
Cc: Kamalesh Babulal <kamalesh@xxxxxxxxxxxxxxxxxx>
Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Mike Pagano <mpagano@xxxxxxxxxx>
[chrisw@xxxxxxxxxxxx: backport to 2.6.24.3]
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
 include/linux/moduleparam.h |   12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

--- a/include/linux/moduleparam.h
+++ b/include/linux/moduleparam.h
@@ -62,6 +62,16 @@ struct kparam_array
 	void *elem;
 };
 
+/* On alpha, ia64 and ppc64 relocations to global data cannot go into
+   read-only sections (which is part of respective UNIX ABI on these
+   platforms). So 'const' makes no sense and even causes compile failures
+   with some compilers. */
+#if defined(CONFIG_ALPHA) || defined(CONFIG_IA64) || defined(CONFIG_PPC64)
+#define __moduleparam_const
+#else
+#define __moduleparam_const const
+#endif
+
 /* This is the fundamental function for registering boot/module
    parameters.  perm sets the visibility in sysfs: 000 means it's
    not there, read bits mean it's readable, write bits mean it's
@@ -71,7 +81,7 @@ struct kparam_array
 	static int __param_perm_check_##name __attribute__((unused)) =	\
 	BUILD_BUG_ON_ZERO((perm) < 0 || (perm) > 0777 || ((perm) & 2));	\
 	static const char __param_str_##name[] = prefix #name;		\
-	static struct kernel_param const __param_##name			\
+	static struct kernel_param __moduleparam_const __param_##name	\
 	__attribute_used__						\
     __attribute__ ((unused,__section__ ("__param"),aligned(sizeof(void *)))) \
 	= { __param_str_##name, perm, set, get, { arg } }

-- 
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/