ARM: smp: improve CPU bringup failure diagnostics
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>
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