2 files changed, 21 insertions, 0 deletions

diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index b77feffbadea..3df1c35a217a 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -161,6 +161,23 @@ config PREFETCH
         def_bool y
         depends on PA8X00 || PA7200
 
+config MLONGCALLS
+        bool "Enable the -mlong-calls compiler option for big kernels"
+        def_bool y if (!MODULES)
+        depends on PA8X00
+        help
+          If you configure the kernel to include many drivers built-in instead
+          as modules, the kernel executable may become too big, so that the
+          linker will not be able to resolve some long branches and fails to link
+          your vmlinux kernel. In that case enabling this option will help you
+          to overcome this limit by using the -mlong-calls compiler option.
+
+          Usually you want to say N here, unless you e.g. want to build
+          a kernel which includes all necessary drivers built-in and which can
+          be used for TFTP booting without the need to have an initrd ramdisk.
+
+          Enabling this option will probably slow down your kernel.
+
 config 64BIT
         bool "64-bit kernel"
         depends on PA8X00
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