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ARM: smp: improve CPU bringup failure diagnostics

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We used to print a bland error message which gave no clue as to the
failure when we failed to bring up a secondary CPU.  Resolve this by
separating the two failure cases.

If boot_secondary() fails, we print a message indicating the returned
error code from boot_secondary():
	"CPU%u: failed to boot: %d\n", cpu, ret.

However, if boot_secondary() succeeded, but the CPU did not appear to
mark itself online within the timeout, indicate that it failed to come
online:
	"CPU%u: failed to come online\n", cpu

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2010-12-18 12:34:39 +00:00
parent 90b44199e8
commit 58613cd1d4
1 changed files with 5 additions and 9 deletions
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14
arch/arm/kernel/smp.c
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@ -164,8 +164,12 @@ int __cpuinit __cpu_up(unsigned int cpu)
barrier(); barrier();
} }
if (!cpu_online(cpu)) if (!cpu_online(cpu)) {
pr_crit("CPU%u: failed to come online\n", cpu);
ret = -EIO; ret = -EIO;
}
} else {
pr_err("CPU%u: failed to boot: %d\n", cpu, ret);
} }
secondary_data.stack = NULL; secondary_data.stack = NULL;
@ -181,14 +185,6 @@ int __cpuinit __cpu_up(unsigned int cpu)
pgd_free(&init_mm, pgd); pgd_free(&init_mm, pgd);
if (ret) {
printk(KERN_CRIT "CPU%u: processor failed to boot\n", cpu);
/*
* FIXME: We need to clean up the new idle thread. --rmk
*/
}
return ret; return ret;
} }