From: Jane Chu <jane.chu@oracle.com>
Date: Tue, 6 Jun 2017 22:25:01 +0000 (-0600)
Subject: arch/sparc: revised support for 4096cpus
X-Git-Tag: v4.1.12-104.0.20170618_1145~48
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=22afd5250f3cd4a94a2aa7aab09cea0f5cb21c97;p=users%2Fjedix%2Flinux-maple.git

arch/sparc: revised support for 4096cpus

In the process of upstreaming patch bbd4b32b05cc529e74b1dd5ee3edc396fa7dd129
that went into uek4 for the NR_CPUS=4096 support, I received and incorporated
a comment to split up the allocation for the mondo block and mondo cpulist.
This patch is to update uek4 for consistency.

Orabug: 25505750

Signed-off-by: Jane Chu <jane.chu@oracle.com>
Reviewed-by: Steve Sistare <steven.sistare@oracle.com>
Signed-off-by: Allen Pais <allen.pais@oracle.com>
---

diff --git a/arch/sparc/kernel/irq_64.c b/arch/sparc/kernel/irq_64.c
index dbdd66bcfcbb9..1bcb2aba19efb 100644
--- a/arch/sparc/kernel/irq_64.c
+++ b/arch/sparc/kernel/irq_64.c
@@ -1231,17 +1231,26 @@ static void __init init_cpu_send_mondo_info(struct trap_per_cpu *tb)
 {
 #ifdef CONFIG_SMP
 	unsigned long page;
-	unsigned int order;
+	void *mondo, *p;
 
-	order = get_order(num_possible_cpus() * sizeof(u16) + 64);
-	page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
+	BUILD_BUG_ON((NR_CPUS * sizeof(u16)) > PAGE_SIZE);
+
+	/* Make sure mondo block is 64byte aligned */
+	p = kzalloc(127, GFP_KERNEL);
+	if (!p) {
+		prom_printf("SUN4V: Error, cannot allocate mondo block.\n");
+		prom_halt();
+	}
+	mondo = (void *)(((unsigned long)p + 63) & ~0x3f);
+	tb->cpu_mondo_block_pa = __pa(mondo);
+
+	page = get_zeroed_page(GFP_KERNEL);
 	if (!page) {
-		prom_printf("SUN4V: Error, cannot allocate cpu mondo pages.\n");
+		prom_printf("SUN4V: Error, cannot allocate cpu list page.\n");
 		prom_halt();
 	}
 
-	tb->cpu_mondo_block_pa = __pa(page);
-	tb->cpu_list_pa = __pa(page + 64);
+	tb->cpu_list_pa = __pa(page);
 #endif
 }