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powerpc/64e: Tie PPC_BOOK3E_64 to PPC_E500MC

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The only 64-bit Book3E CPUs we support require the selection
of CONFIG_PPC_E500MC.

However our Kconfig allows configurating a kernel that has 64-bit
Book3E support, but without CONFIG_PPC_E500MC enabled. Such a kernel
would never boot, it doesn't know about any CPUs.

To fix this, force CONFIG_PPC_E500MC to be selected whenever we are
building a 64-bit Book3E kernel.

And add a test to detect future situations where cpu_specs is empty.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/ae5d8b8b3ccc346e61d2ec729767f92766273f0b.1663606875.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2022-09-19 19:01:26 +02:00 committed by Michael Ellerman
parent d1203f32d8
commit 0069f3d14e
2 changed files with 4 additions and 0 deletions
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2
arch/powerpc/kernel/cputable.c
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@ -2018,6 +2018,8 @@ struct cpu_spec * __init identify_cpu(unsigned long offset, unsigned int pvr)
struct cpu_spec *s = cpu_specs;
int i;
BUILD_BUG_ON(!ARRAY_SIZE(cpu_specs));
s = PTRRELOC(s);
for (i = 0; i < ARRAY_SIZE(cpu_specs); i++,s++) {

2
arch/powerpc/platforms/Kconfig.cputype
View file

@ -108,6 +108,8 @@ config PPC_BOOK3S_64
config PPC_BOOK3E_64
bool "Embedded processors"
select PPC_FSL_BOOK3E
select E500
select PPC_E500MC
select PPC_FPU # Make it a choice ?
select PPC_SMP_MUXED_IPI
select PPC_DOORBELL