This is a note to let you know that I've just added the patch titled
hv: allocate synic pages for all present CPUs
to the 4.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
hv-allocate-synic-pages-for-all-present-cpus.patch
and it can be found in the queue-4.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 421b8f20d3c381b215f988b42428f56fc3b82405 Mon Sep 17 00:00:00 2001
From: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
Date: Wed, 7 Dec 2016 01:16:25 -0800
Subject: hv: allocate synic pages for all present CPUs
From: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/hv/hv.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -411,7 +411,7 @@ 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");
@@ -482,7 +482,7 @@ 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);
}
Patches currently in stable-queue which might be from vkuznets@xxxxxxxxxx are
queue-4.10/hv-init-percpu_list-in-hv_synic_alloc.patch
queue-4.10/drivers-hv-vmbus-raise-retry-wait-limits-in-vmbus_post_msg.patch
queue-4.10/hv-allocate-synic-pages-for-all-present-cpus.patch
queue-4.10/hv-don-t-reset-hv_context.tsc_page-on-crash.patch