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

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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+
This commit is contained in:
Helge Deller 2021-01-26 20:16:21 +01:00
parent 0aa91f84b1
commit 00e35f2b0e
2 changed files with 12 additions and 6 deletions
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5
arch/parisc/Kconfig
View File

@ -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

13
arch/parisc/kernel/entry.S
View File

@ -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 */
/*