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Groups > linux.kernel > #1408870 > unrolled thread
| Started by | Wenwei Tao <wwtao0320@163.com> |
|---|---|
| First post | 2016-05-30 10:50 +0200 |
| Last post | 2016-05-30 13:30 +0200 |
| Articles | 4 — 3 participants |
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[PATCH] mm/memcontrol.c: add memory allocation result check Wenwei Tao <wwtao0320@163.com> - 2016-05-30 10:50 +0200
Re: [PATCH] mm/memcontrol.c: add memory allocation result check Michal Hocko <mhocko@kernel.org> - 2016-05-30 11:00 +0200
Re: [PATCH] mm/memcontrol.c: add memory allocation result check Wenwei Tao <ww.tao0320@gmail.com> - 2016-05-30 11:30 +0200
Re: [PATCH] mm/memcontrol.c: add memory allocation result check Michal Hocko <mhocko@kernel.org> - 2016-05-30 13:30 +0200
| From | Wenwei Tao <wwtao0320@163.com> |
|---|---|
| Date | 2016-05-30 10:50 +0200 |
| Subject | [PATCH] mm/memcontrol.c: add memory allocation result check |
| Message-ID | <rEr3A-1OX-19@gated-at.bofh.it> |
From: Wenwei Tao <ww.tao0320@gmail.com>
The mem_cgroup_tree_per_node allocation might fail,
check that before continue the memcg init. Since it
is in the init phase, trigger the panic if that failure
happens.
Signed-off-by: Wenwei Tao <ww.tao0320@gmail.com>
---
mm/memcontrol.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 925b431..6385c62 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5712,6 +5712,7 @@ static int __init mem_cgroup_init(void)
rtpn = kzalloc_node(sizeof(*rtpn), GFP_KERNEL,
node_online(node) ? node : NUMA_NO_NODE);
+ BUG_ON(!rtpn);
for (zone = 0; zone < MAX_NR_ZONES; zone++) {
struct mem_cgroup_tree_per_zone *rtpz;
--
1.8.3.1
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| From | Michal Hocko <mhocko@kernel.org> |
|---|---|
| Date | 2016-05-30 11:00 +0200 |
| Message-ID | <rErdh-1TA-57@gated-at.bofh.it> |
| In reply to | #1408870 |
On Mon 30-05-16 16:45:51, Wenwei Tao wrote:
> From: Wenwei Tao <ww.tao0320@gmail.com>
>
> The mem_cgroup_tree_per_node allocation might fail,
> check that before continue the memcg init. Since it
> is in the init phase, trigger the panic if that failure
> happens.
We would blow up in the very same function so what is the point of the
explicit BUG_ON?
> Signed-off-by: Wenwei Tao <ww.tao0320@gmail.com>
> ---
> mm/memcontrol.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 925b431..6385c62 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -5712,6 +5712,7 @@ static int __init mem_cgroup_init(void)
>
> rtpn = kzalloc_node(sizeof(*rtpn), GFP_KERNEL,
> node_online(node) ? node : NUMA_NO_NODE);
> + BUG_ON(!rtpn);
>
> for (zone = 0; zone < MAX_NR_ZONES; zone++) {
> struct mem_cgroup_tree_per_zone *rtpz;
> --
> 1.8.3.1
>
>
> --
> To unsubscribe, send a message with 'unsubscribe linux-mm' in
> the body to majordomo@kvack.org. For more info on Linux MM,
> see: http://www.linux-mm.org/ .
> Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
--
Michal Hocko
SUSE Labs
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| From | Wenwei Tao <ww.tao0320@gmail.com> |
|---|---|
| Date | 2016-05-30 11:30 +0200 |
| Message-ID | <rErGh-2in-1@gated-at.bofh.it> |
| In reply to | #1408893 |
I think explicit BUG_ON may make the debug easier, since it can point
out the wrong line.
2016-05-30 16:53 GMT+08:00 Michal Hocko <mhocko@kernel.org>:
> On Mon 30-05-16 16:45:51, Wenwei Tao wrote:
>> From: Wenwei Tao <ww.tao0320@gmail.com>
>>
>> The mem_cgroup_tree_per_node allocation might fail,
>> check that before continue the memcg init. Since it
>> is in the init phase, trigger the panic if that failure
>> happens.
>
> We would blow up in the very same function so what is the point of the
> explicit BUG_ON?
>
>> Signed-off-by: Wenwei Tao <ww.tao0320@gmail.com>
>> ---
>> mm/memcontrol.c | 1 +
>> 1 file changed, 1 insertion(+)
>>
>> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
>> index 925b431..6385c62 100644
>> --- a/mm/memcontrol.c
>> +++ b/mm/memcontrol.c
>> @@ -5712,6 +5712,7 @@ static int __init mem_cgroup_init(void)
>>
>> rtpn = kzalloc_node(sizeof(*rtpn), GFP_KERNEL,
>> node_online(node) ? node : NUMA_NO_NODE);
>> + BUG_ON(!rtpn);
>>
>> for (zone = 0; zone < MAX_NR_ZONES; zone++) {
>> struct mem_cgroup_tree_per_zone *rtpz;
>> --
>> 1.8.3.1
>>
>>
>> --
>> To unsubscribe, send a message with 'unsubscribe linux-mm' in
>> the body to majordomo@kvack.org. For more info on Linux MM,
>> see: http://www.linux-mm.org/ .
>> Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
>
> --
> Michal Hocko
> SUSE Labs
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| From | Michal Hocko <mhocko@kernel.org> |
|---|---|
| Date | 2016-05-30 13:30 +0200 |
| Message-ID | <rEtyq-3wi-15@gated-at.bofh.it> |
| In reply to | #1408934 |
On Mon 30-05-16 17:28:40, Wenwei Tao wrote:
> I think explicit BUG_ON may make the debug easier, since it can point
> out the wrong line.
Does it? NULL ptr dereferencec 6 lines below sounds pretty close to me.
I am not nacking this patch I just think it doesn't add much. If others
think it will be useful I will not object.
> 2016-05-30 16:53 GMT+08:00 Michal Hocko <mhocko@kernel.org>:
> > On Mon 30-05-16 16:45:51, Wenwei Tao wrote:
> >> From: Wenwei Tao <ww.tao0320@gmail.com>
> >>
> >> The mem_cgroup_tree_per_node allocation might fail,
> >> check that before continue the memcg init. Since it
> >> is in the init phase, trigger the panic if that failure
> >> happens.
> >
> > We would blow up in the very same function so what is the point of the
> > explicit BUG_ON?
> >
> >> Signed-off-by: Wenwei Tao <ww.tao0320@gmail.com>
> >> ---
> >> mm/memcontrol.c | 1 +
> >> 1 file changed, 1 insertion(+)
> >>
> >> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> >> index 925b431..6385c62 100644
> >> --- a/mm/memcontrol.c
> >> +++ b/mm/memcontrol.c
> >> @@ -5712,6 +5712,7 @@ static int __init mem_cgroup_init(void)
> >>
> >> rtpn = kzalloc_node(sizeof(*rtpn), GFP_KERNEL,
> >> node_online(node) ? node : NUMA_NO_NODE);
> >> + BUG_ON(!rtpn);
> >>
> >> for (zone = 0; zone < MAX_NR_ZONES; zone++) {
> >> struct mem_cgroup_tree_per_zone *rtpz;
> >> --
> >> 1.8.3.1
> >>
> >>
> >> --
> >> To unsubscribe, send a message with 'unsubscribe linux-mm' in
> >> the body to majordomo@kvack.org. For more info on Linux MM,
> >> see: http://www.linux-mm.org/ .
> >> Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
> >
> > --
> > Michal Hocko
> > SUSE Labs
>
> --
> To unsubscribe, send a message with 'unsubscribe linux-mm' in
> the body to majordomo@kvack.org. For more info on Linux MM,
> see: http://www.linux-mm.org/ .
> Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
--
Michal Hocko
SUSE Labs
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