One of the randconfig build failed with the error:
arch/m32r/kernel/smp.c: In function 'smp_flush_tlb_mm':
arch/m32r/kernel/smp.c:283:20: error: subscripted value is neither array nor pointer nor vector
mmc = &mm->context[cpu_id];
^
arch/m32r/kernel/smp.c: In function 'smp_flush_tlb_page':
arch/m32r/kernel/smp.c:353:20: error: subscripted value is neither array nor pointer nor vector
mmc = &mm->context[cpu_id];
^
arch/m32r/kernel/smp.c: In function 'smp_invalidate_interrupt':
arch/m32r/kernel/smp.c:479:41: error: subscripted value is neither array nor pointer nor vector
unsigned long *mmc = &flush_mm->context[cpu_id];
It turned out that CONFIG_SMP was defined but CONFIG_MMU was not
defined. But arch/m32r/include/asm/mmu.h only defines mm_context_t as an
array when both CONFIG_SMP and CONFIG_MMU are defined. And
arch/m32r/kernel/smp.c is always using context as an array. So without
MMU SMP can not work.
Signed-off-by: Sudip Mukherjee <sudip@xxxxxxxxxxxxxxx>
---
arch/m32r/Kconfig | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/m32r/Kconfig b/arch/m32r/Kconfig
index 836ac5a..2841c0a 100644
--- a/arch/m32r/Kconfig
+++ b/arch/m32r/Kconfig
@@ -276,6 +276,7 @@ source "kernel/Kconfig.preempt"
config SMP
bool "Symmetric multi-processing support"
+ depends on MMU
---help---
This enables support for systems with more than one CPU. If you have
a system with only one CPU, say N. If you have a system with more
--
1.9.1
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