Re: [PATCH V2 06/15] hv: allocate synic pages for all present CPUs

[Greg KH]

On Sat, Dec 03, 2016 at 12:34:33PM -0800, k...@exchange.microsoft.com wrote:
> From: Vitaly Kuznetsov 
> 
> 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 
> Signed-off-by: K. Y. Srinivasan 
> ---
>  drivers/hv/hv.c |4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)

For stable releases?
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[PATCH V2 06/15] hv: allocate synic pages for all present CPUs

[kys]

From: Vitaly Kuznetsov 

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 
Signed-off-by: K. Y. Srinivasan 
---
 drivers/hv/hv.c |4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index 60dbd6c..e4bb498 100644
--- 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);
 }
 
-- 
1.7.4.1

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