powerpc/smp: smp_ops->kick_cpu() should be able to fail
When we start a cpu we use smp_ops->kick_cpu(), which currently
returns void, it should be able to fail. Convert it to return
int, and update all uses.
Convert all the current error cases to return -ENOENT, which is
what would eventually be returned by __cpu_up() currently when
it doesn't detect the cpu as coming up in time.
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index cbdbb14..b6083f4 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -95,7 +95,7 @@
static void (*crash_ipi_function_ptr)(struct pt_regs *) = NULL;
#ifdef CONFIG_PPC64
-void __devinit smp_generic_kick_cpu(int nr)
+int __devinit smp_generic_kick_cpu(int nr)
{
BUG_ON(nr < 0 || nr >= NR_CPUS);
@@ -106,6 +106,8 @@
*/
paca[nr].cpu_start = 1;
smp_mb();
+
+ return 0;
}
#endif
@@ -434,7 +436,11 @@
/* wake up cpus */
DBG("smp: kicking cpu %d\n", cpu);
- smp_ops->kick_cpu(cpu);
+ rc = smp_ops->kick_cpu(cpu);
+ if (rc) {
+ pr_err("smp: failed starting cpu %d (rc %d)\n", cpu, rc);
+ return rc;
+ }
/*
* wait to see if the cpu made a callin (is actually up).