From: Vitaly Kuznetsov <vkuznets@redhat.com>
Date: Wed, 7 Dec 2016 09:16:25 +0000 (-0800)
Subject: hv: allocate synic pages for all present CPUs
X-Git-Tag: Ubuntu-snapdragon-4.4.0-1057.61~870
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=bd8c77f21edba7202d07d39f8878bc2d4c5ddde0;p=mirror_ubuntu-zesty-kernel.git

hv: allocate synic pages for all present CPUs

BugLink: http://bugs.launchpad.net/bugs/1673538

commit 421b8f20d3c381b215f988b42428f56fc3b82405 upstream.

It may happen that not all CPUs are online when we do hv_synic_alloc() and
in case more CPUs come online later we may try accessing these allocated
structures.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
---

diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index 60db5ff43a03..a908064e6329 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -420,7 +420,7 @@ int hv_synic_alloc(void)
 		goto err;
 	}
 
-	for_each_online_cpu(cpu) {
+	for_each_present_cpu(cpu) {
 		hv_context.event_dpc[cpu] = kmalloc(size, GFP_ATOMIC);
 		if (hv_context.event_dpc[cpu] == NULL) {
 			pr_err("Unable to allocate event dpc\n");
@@ -491,7 +491,7 @@ void hv_synic_free(void)
 	int cpu;
 
 	kfree(hv_context.hv_numa_map);
-	for_each_online_cpu(cpu)
+	for_each_present_cpu(cpu)
 		hv_synic_free_cpu(cpu);
 }