MIPS: reserve exception vector space ONLY ONCE

[ 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>

diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index afb2c955d99ef4ce51913bf0fcfc69766f0e9b9d..5c01a21a216b9a582f3d867edc1a214ed9030e5c 100644 (file)
--- 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)