From: James Morse <>

loongarch, mips, parisc, riscv and sh all print a warning if
register_cpu() returns an error. Architectures that use
GENERIC_CPU_DEVICES call panic() instead.

Errors in this path indicate something is wrong with the firmware
description of the platform, but the kernel is able to keep running.

Downgrade this to a warning to make it easier to debug this issue.

This will allow architectures that switching over to GENERIC_CPU_DEVICES
to drop their warning, but keep the existing behaviour.

Signed-off-by: James Morse <>
Reviewed-by: Russell King (Oracle) <>
Reviewed-by: Shaoqin Huang <>
Signed-off-by: Russell King (Oracle) <>
 drivers/base/cpu.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index 221ffbeb1c9b..82b6a76125f5 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -551,14 +551,15 @@ void __weak arch_unregister_cpu(int num)
 static void __init cpu_dev_register_generic(void)
-       int i;
+       int i, ret;
        for_each_present_cpu(i) {
-               if (arch_register_cpu(i))
-                       panic("Failed to register CPU device");
+               ret = arch_register_cpu(i);
+               if (ret)
+                       pr_warn("register_cpu %d failed (%d)\n", i, ret);

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