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powerpc/smp: soft-replugged CPUs must go back to start_secondary

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Various thing are torn down when a CPU is hot-unplugged. That CPU
is expected to go back to start_secondary when re-plugged to re
initialize everything, such as clock sources, maps, ...

Some implementations just return from cpu_die() callback
in the idle loop when the CPU is "re-plugged". This is not enough.

We fix it using a little asm trampoline which resets the stack
and calls back into start_secondary as if we were all fresh from
boot. The trampoline already existed on ppc64, but we add it for
ppc32

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Herrenschmidt
2011-02-10 18:45:24 +11:00
parent 963e5d3b76
commit fa3f82c8bb
4 changed files with 17 additions and 4 deletions
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arch/powerpc/include/asm/smp.h
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@@ -36,6 +36,7 @@ extern void cpu_die(void);
extern void smp_send_debugger_break(int cpu);
extern void smp_message_recv(int);
extern void start_secondary_resume(void);
DECLARE_PER_CPU(unsigned int, cpu_pvr);