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[POWERPC] ppc64: support CONFIG_DEBUG_PREEMPT

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Add CONFIG_DEBUG_PREEMPT support to ppc64: it was useful for testing
get_paca() preemption.  Cheat a little, just use debug_smp_processor_id()
in the debug version of get_paca(): it contains all the right checks and
reporting, though get_paca() doesn't really use smp_processor_id().

Use local_paca for what might have been called __raw_get_paca().
Silence harmless warnings from io.h and lparcfg.c with local_paca -
it is okay for iseries_lparcfg_data to be referencing shared_proc
with preemption enabled: all cpus should show the same value for
shared_proc.

Why do other architectures need TRACE_IRQFLAGS_SUPPORT for DEBUG_PREEMPT?
I don't know, ppc64 appears to get along fine without it.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Hugh Dickins
2006-11-01 05:44:54 +11:00
committed by Paul Mackerras
parent 5669c3cf19
commit 048c8bc90e
6 changed files with 16 additions and 5 deletions
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2
arch/powerpc/kernel/lparcfg.c
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@@ -77,7 +77,7 @@ static int iseries_lparcfg_data(struct seq_file *m, void *v)
int processors, max_processors;
unsigned long purr = get_purr();
shared = (int)(get_lppaca()->shared_proc);
shared = (int)(local_paca->lppaca_ptr->shared_proc);
seq_printf(m, "system_active_processors=%d\n",
(int)HvLpConfig_getSystemPhysicalProcessors());