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parisc: Enable -mlong-calls gcc option with CONFIG_COMPILE_TEST

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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: 00e35f2b0e ("parisc: Enable -mlong-calls gcc option by default when !CONFIG_MODULES")
Cc: stable@vger.kernel.org # v5.6+
This commit is contained in:
Helge Deller 2021-03-02 21:07:07 +01:00
parent fe07bfda2f
commit 778e45d772
1 changed files with 5 additions and 2 deletions
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7
arch/parisc/Kconfig
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@ -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