From: Luming Yu <luyu@redhat.com>
Date: Sat, 13 Sep 2008 00:52:38 +0800
Subject: [ia64] set default max_purges=1 regardless of PAL return
Message-id: 48CA9E56.5070807@redhat.com
O-Subject: [RHEL 5.3 PATCH 1/1] bz 451593: set max_purges=1 by default regardless what PAL returns
Bugzilla: 451593
RH-Acked-by: Prarit Bhargava <prarit@redhat.com>

Update the patch series against -105 kernel. And add one more patch to
set max_purges=1 by default regardless what PAL returns to make sure no
regressions.
Please revew and ACKs.
NOTE: to apply, please keep it in this order:
1. [RHEL 5.3 PATCH 1/2] bz 451593: Multiple    outstanding    ptc.g
instruction support
2. [RHEL 5.3 PATCH 2/2]  bz 451593: Kernel parameter for max number
of concurrent global TLB purges
3. [RHEL 5.3 PATCH 1/1] bz 451593: set max_purges=1 by default
regardless what PAL returns

Test status:
Boot fine on tiger4 and Cold fusion, and nothing unusual found.

Please review and ACK.

Thanks,
Luming

diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
index 3e8b5f8..f96c41d 100644
--- a/arch/ia64/kernel/setup.c
+++ b/arch/ia64/kernel/setup.c
@@ -1069,6 +1069,11 @@ cpu_init (void)
 	/* set ia64_ctx.max_rid to the maximum RID that is supported by all CPUs: */
 	if (ia64_pal_vm_summary(NULL, &vmi) == 0) {
 		max_ctx = (1U << (vmi.pal_vm_info_2_s.rid_size - 3)) - 1;
+		if (vmi.pal_vm_info_2_s.max_purges!=1){
+			printk(KERN_WARNING "cpu_init: PAL max_purges is overridden to 1 "
+				"PALO is required for multiple outsanding ptc.g \n");
+			vmi.pal_vm_info_2_s.max_purges = 1;
+		}
 		setup_ptcg_sem(vmi.pal_vm_info_2_s.max_purges, NPTCG_FROM_PAL);
 	} else {
 		printk(KERN_WARNING "cpu_init: PAL VM summary failed, assuming 18 RID bits\n");