[PATCH] ppc64: Spread lpevents by default on iSeries

[Michael Ellerman]

This patch changes the macros that initialise the paca array on iSeries,
such that every CPU processes lpevents by default. This makes the default
behaviour equivalent to specifying "spread_lpevents=n" on the kernel
command line, where n = number of cpus.

The spread_lpevents command line option remains in case people want the
old behaviour.


Signed-off-by: Michael Ellerman <michael at ellerman.id.au>

---

 arch/ppc64/kernel/iSeries_setup.c |    3 +++
 arch/ppc64/kernel/pacaData.c      |    8 ++++----
 2 files changed, 7 insertions(+), 4 deletions(-)

Index: work/arch/ppc64/kernel/pacaData.c
===================================================================
--- work.orig/arch/ppc64/kernel/pacaData.c
+++ work/arch/ppc64/kernel/pacaData.c
@@ -62,9 +62,9 @@ extern unsigned long __toc_start;
 	},								    \
 
 #ifdef CONFIG_PPC_ISERIES
-#define PACA_INIT_ISERIES(number, lpq)					    \
+#define PACA_INIT_ISERIES(number)					    \
 	.lppaca_ptr = &paca[number].lppaca,				    \
-	.lpqueue_ptr = (lpq),		/* &xItLpQueue, */		    \
+	.lpqueue_ptr = &xItLpQueue,					    \
 	.reg_save_ptr = &paca[number].reg_save,				    \
 	.reg_save = {							    \
 		.xDesc = 0xd397d9e2,	/* "LpRS" */			    \
@@ -74,13 +74,13 @@ extern unsigned long __toc_start;
 #define PACAINITDATA(number)						    \
 {									    \
 	PACA_INIT_COMMON(number, 0, 0, 0)				    \
-	PACA_INIT_ISERIES(number, NULL)					    \
+	PACA_INIT_ISERIES(number)					    \
 }
 
 #define BOOTCPU_PACAINITDATA(number)					    \
 {									    \
 	PACA_INIT_COMMON(number, 1, 0, STAB0_VIRT_ADDR)			    \
-	PACA_INIT_ISERIES(number, &xItLpQueue)				    \
+	PACA_INIT_ISERIES(number)					    \
 }
 
 #else
Index: work/arch/ppc64/kernel/iSeries_setup.c
===================================================================
--- work.orig/arch/ppc64/kernel/iSeries_setup.c
+++ work/arch/ppc64/kernel/iSeries_setup.c
@@ -871,6 +871,9 @@ static int set_spread_lpevents(char *str
 		for (i = 1; i < val; ++i)
 			paca[i].lpqueue_ptr = paca[0].lpqueue_ptr;
 
+		for (; i < NR_CPUS; ++i)
+			paca[i].lpqueue_ptr = NULL;
+
 		printk("lpevent processing spread over %ld processors\n", val);
 	} else {
 		printk("invalid spread_lpevents %ld\n", val);