After commit 9cce844abf07 ("MIPS: CPU#0 is not hotpluggable"),
c->hotpluggable is 0 for CPU 0 and it will not generate a control
file in sysfs for this CPU:
[root@linux loongson]# cat /sys/devices/system/cpu/cpu0/online
cat: /sys/devices/system/cpu/cpu0/online: No such file or directory
[root@linux loongson]# echo 0 > /sys/devices/system/cpu/cpu0/online
bash: /sys/devices/system/cpu/cpu0/online: Permission denied
So no need to check CPU 0 in {loongson3,bmips,octeon}_cpu_disable(),
just remove them.
Signed-off-by: Tiezhu Yang <yangtiezhu@xxxxxxxxxxx>
---
arch/mips/cavium-octeon/smp.c | 3 ---
arch/mips/kernel/smp-bmips.c | 3 ---
arch/mips/loongson64/smp.c | 3 ---
3 files changed, 9 deletions(-)
diff --git a/arch/mips/cavium-octeon/smp.c b/arch/mips/cavium-octeon/smp.c
index 076db9a..66ce552 100644
--- a/arch/mips/cavium-octeon/smp.c
+++ b/arch/mips/cavium-octeon/smp.c
@@ -290,9 +290,6 @@ static int octeon_cpu_disable(void)
{
unsigned int cpu = smp_processor_id();
- if (cpu == 0)
- return -EBUSY;
-
if (!octeon_bootloader_entry_addr)
return -ENOTSUPP;
diff --git a/arch/mips/kernel/smp-bmips.c b/arch/mips/kernel/smp-bmips.c
index 1dbfb5a..359b176 100644
--- a/arch/mips/kernel/smp-bmips.c
+++ b/arch/mips/kernel/smp-bmips.c
@@ -362,9 +362,6 @@ static int bmips_cpu_disable(void)
{
unsigned int cpu = smp_processor_id();
- if (cpu == 0)
- return -EBUSY;
-
pr_info("SMP: CPU%d is offline\n", cpu);
set_cpu_online(cpu, false);
diff --git a/arch/mips/loongson64/smp.c b/arch/mips/loongson64/smp.c
index aa0cd72..b8c1fc3 100644
--- a/arch/mips/loongson64/smp.c
+++ b/arch/mips/loongson64/smp.c
@@ -544,9 +544,6 @@ static int loongson3_cpu_disable(void)
unsigned long flags;
unsigned int cpu = smp_processor_id();
- if (cpu == 0)
- return -EBUSY;
-
set_cpu_online(cpu, false);
calculate_cpu_foreign_map();
local_irq_save(flags);
--
2.1.0
