tilepro: work around module link error with gcc 4.7

commit 3cb3f839d306443f3d1e79b0bde1a2ad2c12b555 upstream.

gcc 4.7.x is emitting calls to __ffsdi2 where previously
it used to inline the appropriate ctz instructions.
While this needs to be fixed in gcc, it's also easy to avoid
having it cause build failures when building with those
compilers by exporting __ffsdi2 to modules.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/tile/lib/exports.c b/arch/tile/lib/exports.c
index 49284fae9d09edb203156bb08a2caf7ccd736d35..0996ef7ebd895d04753e82b3b2a20fcab1986b08 100644 (file)
--- a/arch/tile/lib/exports.c
+++ b/arch/tile/lib/exports.c
@@ -89,4 +89,6 @@ uint64_t __ashrdi3(uint64_t, unsigned int);
 EXPORT_SYMBOL(__ashrdi3);
 uint64_t __ashldi3(uint64_t, unsigned int);
 EXPORT_SYMBOL(__ashldi3);
+int __ffsdi2(uint64_t);
+EXPORT_SYMBOL(__ffsdi2);
 #endif