parisc: add CONFIG_MLONGCALLS option to enable linkage of huge vmlinux executables

When building a 64bit kernel which includes all necessary drivers and
filesystems the vmlinux kernel often gets so huge, that the linker won't
be able to resolve the branch stubs. This patch overcomes this limit by
providing an option to compile the kernel with the -mlong-calls compiler
option.

Signed-off-by: Helge Deller <deller@gmx.de>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/parisc/Makefile b/arch/parisc/Makefile
index 87f64d6b5dcb..ed9a14ccd066 100644
--- a/arch/parisc/Makefile
+++ b/arch/parisc/Makefile
@@ -64,6 +64,10 @@ ifndef CONFIG_FUNCTION_TRACER
   cflags-y      += -ffunction-sections
 endif
 
+# Use long jumps instead of long branches (needed if your linker fails to
+# link a too big vmlinux executable)
+cflags-$(CONFIG_MLONGCALLS)     += -mlong-calls
+
 # select which processor to optimise for
 cflags-$(CONFIG_PA7100)         += -march=1.1 -mschedule=7100
 cflags-$(CONFIG_PA7200)         += -march=1.1 -mschedule=7200