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[POWERPC] Fix CPU hotplug when using the SLB shadow buffer

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Before we register the SLB shadow buffer, we need to invalidate the
entries in the buffer, otherwise we can end up stale entries from when
we previously offlined the CPU.

This does this invalidate as well as unregistering the buffer with
PHYP before we offline the cpu.  Tested and fixes crashes seen on
970MP (thanks to tonyb) and POWER5.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Michael Neuling
2008-01-11 14:02:47 +11:00
committed by Paul Mackerras
parent 6f4347c969
commit 473980a993
4 changed files with 12 additions and 0 deletions
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arch/powerpc/platforms/pseries/hotplug-cpu.c
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@ -29,6 +29,7 @@
#include <asm/vdso_datapage.h>
#include <asm/pSeries_reconfig.h>
#include "xics.h"
#include "plpar_wrappers.h"
/* This version can't take the spinlock, because it never returns */
static struct rtas_args rtas_stop_self_args = {
@ -58,6 +59,7 @@ static void pseries_mach_cpu_die(void)
local_irq_disable();
idle_task_exit();
xics_teardown_cpu(0);
unregister_slb_shadow(hard_smp_processor_id(), __pa(get_slb_shadow()));
rtas_stop_self();
/* Should never get here... */
BUG();