5.15-stable review patch. If anyone has any objections, please let me know.
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From: Huang Pei huangpei@loongson.cn
[ Upstream commit abcabb9e30a1f9a69c76776f8abffc31c377b542 ]
"cpu_probe" is called both by BP and APs, but reserving exception vector (like 0x0-0x1000) called by "cpu_probe" need once and calling on APs is too late since memblock is unavailable at that time.
So, reserve exception vector ONLY by BP.
Suggested-by: Thomas Bogendoerfer tsbogend@alpha.franken.de Signed-off-by: Huang Pei huangpei@loongson.cn Signed-off-by: Thomas Bogendoerfer tsbogend@alpha.franken.de Signed-off-by: Sasha Levin sashal@kernel.org --- arch/mips/kernel/traps.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c index afb2c955d99ef..5c01a21a216b9 100644 --- a/arch/mips/kernel/traps.c +++ b/arch/mips/kernel/traps.c @@ -2001,7 +2001,13 @@ unsigned long vi_handlers[64];
void reserve_exception_space(phys_addr_t addr, unsigned long size) { - memblock_reserve(addr, size); + /* + * reserve exception space on CPUs other than CPU0 + * is too late, since memblock is unavailable when APs + * up + */ + if (smp_processor_id() == 0) + memblock_reserve(addr, size); }
void __init *set_except_vector(int n, void *addr)