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powerpc/smp: smp_ops->kick_cpu() should be able to fail

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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>
This commit is contained in:
Michael Ellerman
2011-04-11 21:46:19 +00:00
committed by Benjamin Herrenschmidt
parent 6c5b59b913
commit de30097476
12 changed files with 46 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files
arch/powerpc/kernel/smp.c
+8 -2
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@@ -95,7 +95,7 @@ int smt_enabled_at_boot = 1;
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 @@ void __devinit smp_generic_kick_cpu(int nr)
*/
paca[nr].cpu_start = 1;
smp_mb();
return 0;
}
#endif
@@ -434,7 +436,11 @@ int __cpuinit __cpu_up(unsigned int cpu)
/* 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).