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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2011-02-10 10:45:24 +0300 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2011-04-01 08:37:09 +0400 |
| commit | fa3f82c8bb7acbe049ea71f258b3ae0a33d9d40b (patch) | |
| tree | 9c5e71195c7948c139ea37d8d0e0287f062910f9 /arch/powerpc/include | |
| parent | 963e5d3b76d657f1ebcf3561446d2ba1872bbfa2 (diff) | |
| download | linux-fa3f82c8bb7acbe049ea71f258b3ae0a33d9d40b.tar.xz | |
powerpc/smp: soft-replugged CPUs must go back to start_secondary
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>
Diffstat (limited to 'arch/powerpc/include')
| -rw-r--r-- | arch/powerpc/include/asm/smp.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/smp.h b/arch/powerpc/include/asm/smp.h index 66e237bbe15f..1de0e97a394f 100644 --- a/arch/powerpc/include/asm/smp.h +++ b/arch/powerpc/include/asm/smp.h @@ -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); |