parisc: Enable -mlong-calls gcc option with CONFIG_COMPILE_TEST

The kernel test robot reported multiple linkage problems like this:

    hppa64-linux-ld: init/main.o(.init.text+0x56c): cannot reach printk
    init/main.o: in function `unknown_bootoption':
    (.init.text+0x56c): relocation truncated to fit: R_PARISC_PCREL22F against
	symbol `printk' defined in .text.unlikely section in kernel/printk/printk.o

There are two ways to solve it:
a) Enable the -mlong-call compiler option (CONFIG_MLONGCALLS),
b) Add long branch stub support in 64-bit linker.

While b) is the long-term solution, this patch works around the issue by
automatically enabling the CONFIG_MLONGCALLS option when
CONFIG_COMPILE_TEST is set, which indicates that a non-production kernel
(e.g. 0-day kernel) is built.
Signed-off-by: Helge Deller <deller@gmx.de>
Reported-by: kernel test robot <lkp@intel.com>
Fixes: 00e35f2b ("parisc: Enable -mlong-calls gcc option by default when !CONFIG_MODULES")
Cc: stable@vger.kernel.org # v5.6+

arch/parisc/Kconfig

@@ -203,9 +203,12 @@ config PREFETCH
 	def_bool y
 	depends on PA8X00 || PA7200
 
+config PARISC_HUGE_KERNEL
+	def_bool y if !MODULES || UBSAN || FTRACE || COMPILE_TEST
+
 config MLONGCALLS
-	def_bool y if !MODULES || UBSAN || FTRACE
-	bool "Enable the -mlong-calls compiler option for big kernels" if MODULES && !UBSAN && !FTRACE
+	def_bool y if PARISC_HUGE_KERNEL
+	bool "Enable the -mlong-calls compiler option for big kernels" if !PARISC_HUGE_KERNEL
 	depends on PA8X00
 	help
 	  If you configure the kernel to include many drivers built-in instead