parisc: Enable -mlong-calls gcc option by default when !CONFIG_MODULES

When building a kernel without module support, the CONFIG_MLONGCALL option
needs to be enabled in order to reach symbols which are outside of a 22-bit
branch.

This patch changes the autodetection in the Kconfig script to always enable
CONFIG_MLONGCALL when modules are disabled and uses a far call to
preempt_schedule_irq() in intr_do_preempt() to reach the symbol in all cases.

Signed-off-by: Helge Deller <deller@gmx.de>
Reported-by: kernel test robot <lkp@intel.com>
Cc: stable@vger.kernel.org # v5.6+

diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index 78b1762..2784621 100644 (file)
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -202,9 +202,8 @@ config PREFETCH
        depends on PA8X00 || PA7200
 
 config MLONGCALLS
-       bool "Enable the -mlong-calls compiler option for big kernels"
-       default y if !MODULES || UBSAN || FTRACE
-       default n
+       def_bool y if !MODULES || UBSAN || FTRACE
+       bool "Enable the -mlong-calls compiler option for big kernels" if MODULES && !UBSAN && !FTRACE
        depends on PA8X00
        help
          If you configure the kernel to include many drivers built-in instead

diff --git a/arch/parisc/kernel/entry.S b/arch/parisc/kernel/entry.S
index beba981..4d37cc9 100644 (file)
--- a/arch/parisc/kernel/entry.S
+++ b/arch/parisc/kernel/entry.S
@@ -997,10 +997,17 @@ intr_do_preempt:
        bb,<,n  %r20, 31 - PSW_SM_I, intr_restore
        nop
 
+       /* ssm PSW_SM_I done later in intr_restore */
+#ifdef CONFIG_MLONGCALLS
+       ldil    L%intr_restore, %r2
+       load32  preempt_schedule_irq, %r1
+       bv      %r0(%r1)
+       ldo     R%intr_restore(%r2), %r2
+#else
+       ldil    L%intr_restore, %r1
        BL      preempt_schedule_irq, %r2
-       nop
-
-       b,n     intr_restore            /* ssm PSW_SM_I done by intr_restore */
+       ldo     R%intr_restore(%r1), %r2
+#endif
 #endif /* CONFIG_PREEMPTION */
 
        /*