* [patch] cpuset: fix crash when adding CPUs to an empty set
@ 2015-01-21 6:16 Mike Galbraith
2015-01-28 2:41 ` Zefan Li
0 siblings, 1 reply; 7+ messages in thread
From: Mike Galbraith @ 2015-01-21 6:16 UTC (permalink / raw)
To: LKML; +Cc: Li Zefan
While creating a set of shielded CPUs, we passed cpuset_cpumask_can_shrink()
an empty cpumask (cur), and dl_bw_of(cpumask_any(cur)) made boom with it.
[ 514.513841] CPU: 0 PID: 6942 Comm: shield.sh Not tainted 3.19.0-master #19
[ 514.513841] Hardware name: MEDIONPC MS-7502/MS-7502, BIOS 6.00 PG 12/26/2007
[ 514.513841] task: ffff880224552450 ti: ffff8800caab8000 task.ti: ffff8800caab8000
[ 514.513841] RIP: 0010:[<ffffffff81073846>] [<ffffffff81073846>] cpuset_cpumask_can_shrink+0x56/0xb0
[ 514.513841] RSP: 0018:ffff8800caabbda8 EFLAGS: 00010202
[ 514.513841] RAX: 0000ffff00000000 RBX: ffff880037ae2ab8 RCX: 0000000000000000
[ 514.513841] RDX: 0000000000012900 RSI: 0000000000000000 RDI: 000000000000000c
[ 514.513841] RBP: ffff8800caabbdc8 R08: ffff880037ae2ab8 R09: 0000000000000034
[ 514.513841] R10: 00000077e6fd3d1a R11: ffff88022e9b301c R12: ffff880223c98ab8
[ 514.513841] R13: ffff880037ae2a00 R14: 0000000000000004 R15: ffff8802254b3c60
[ 514.513841] FS: 00007fdbab533700(0000) GS:ffff88022fc00000(0000) knlGS:0000000000000000
[ 514.513841] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 514.513841] CR2: 00007ffff8ab8000 CR3: 00000000bef11000 CR4: 00000000000007f0
[ 514.513841] Stack:
[ 514.513841] ffff880223c98ab8 ffffffff81a46c20 ffff880223c98a00 ffff880037ae2a00
[ 514.513841] ffff8800caabbdf8 ffffffff810cb82a ffff8800caabbdf8 ffff880037ae2a00
[ 514.513841] ffff8800ca9e5240 0000000000000000 ffff8800caabbe48 ffffffff810cc877
[ 514.513841] Call Trace:
[ 514.513841] [<ffffffff810cb82a>] validate_change+0x18a/0x200
[ 514.513841] [<ffffffff810cc877>] cpuset_write_resmask+0x3b7/0x720
[ 514.513841] [<ffffffff810c4d58>] cgroup_file_write+0x38/0x100
[ 514.513841] [<ffffffff811d953a>] kernfs_fop_write+0x12a/0x180
[ 514.513841] [<ffffffff8116e1a3>] vfs_write+0xb3/0x1d0
[ 514.513841] [<ffffffff8116ed06>] SyS_write+0x46/0xb0
[ 514.513841] [<ffffffff8159ced6>] system_call_fastpath+0x16/0x1b
Signed-off-by: Mike Galbraith <umgwanakikbuti@gmail.com>
---
kernel/cpuset.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -511,7 +511,7 @@ static int validate_change(struct cpuset
* tasks.
*/
ret = -EBUSY;
- if (is_cpu_exclusive(cur) &&
+ if (is_cpu_exclusive(cur) && !cpumask_empty(cur->cpus_allowed) &&
!cpuset_cpumask_can_shrink(cur->cpus_allowed,
trial->cpus_allowed))
goto out;
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [patch] cpuset: fix crash when adding CPUs to an empty set
2015-01-21 6:16 [patch] cpuset: fix crash when adding CPUs to an empty set Mike Galbraith
@ 2015-01-28 2:41 ` Zefan Li
2015-01-28 3:53 ` Mike Galbraith
0 siblings, 1 reply; 7+ messages in thread
From: Zefan Li @ 2015-01-28 2:41 UTC (permalink / raw)
To: Mike Galbraith; +Cc: LKML
Hi Mike,
On 2015/1/21 14:16, Mike Galbraith wrote:
>
> While creating a set of shielded CPUs, we passed cpuset_cpumask_can_shrink()
> an empty cpumask (cur), and dl_bw_of(cpumask_any(cur)) made boom with it.
>
> [ 514.513841] CPU: 0 PID: 6942 Comm: shield.sh Not tainted 3.19.0-master #19
> [ 514.513841] Hardware name: MEDIONPC MS-7502/MS-7502, BIOS 6.00 PG 12/26/2007
> [ 514.513841] task: ffff880224552450 ti: ffff8800caab8000 task.ti: ffff8800caab8000
> [ 514.513841] RIP: 0010:[<ffffffff81073846>] [<ffffffff81073846>] cpuset_cpumask_can_shrink+0x56/0xb0
> [ 514.513841] RSP: 0018:ffff8800caabbda8 EFLAGS: 00010202
> [ 514.513841] RAX: 0000ffff00000000 RBX: ffff880037ae2ab8 RCX: 0000000000000000
> [ 514.513841] RDX: 0000000000012900 RSI: 0000000000000000 RDI: 000000000000000c
> [ 514.513841] RBP: ffff8800caabbdc8 R08: ffff880037ae2ab8 R09: 0000000000000034
> [ 514.513841] R10: 00000077e6fd3d1a R11: ffff88022e9b301c R12: ffff880223c98ab8
> [ 514.513841] R13: ffff880037ae2a00 R14: 0000000000000004 R15: ffff8802254b3c60
> [ 514.513841] FS: 00007fdbab533700(0000) GS:ffff88022fc00000(0000) knlGS:0000000000000000
> [ 514.513841] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 514.513841] CR2: 00007ffff8ab8000 CR3: 00000000bef11000 CR4: 00000000000007f0
> [ 514.513841] Stack:
> [ 514.513841] ffff880223c98ab8 ffffffff81a46c20 ffff880223c98a00 ffff880037ae2a00
> [ 514.513841] ffff8800caabbdf8 ffffffff810cb82a ffff8800caabbdf8 ffff880037ae2a00
> [ 514.513841] ffff8800ca9e5240 0000000000000000 ffff8800caabbe48 ffffffff810cc877
> [ 514.513841] Call Trace:
> [ 514.513841] [<ffffffff810cb82a>] validate_change+0x18a/0x200
> [ 514.513841] [<ffffffff810cc877>] cpuset_write_resmask+0x3b7/0x720
> [ 514.513841] [<ffffffff810c4d58>] cgroup_file_write+0x38/0x100
> [ 514.513841] [<ffffffff811d953a>] kernfs_fop_write+0x12a/0x180
> [ 514.513841] [<ffffffff8116e1a3>] vfs_write+0xb3/0x1d0
> [ 514.513841] [<ffffffff8116ed06>] SyS_write+0x46/0xb0
> [ 514.513841] [<ffffffff8159ced6>] system_call_fastpath+0x16/0x1b
>
> Signed-off-by: Mike Galbraith <umgwanakikbuti@gmail.com>
>
> ---
> kernel/cpuset.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> --- a/kernel/cpuset.c
> +++ b/kernel/cpuset.c
> @@ -511,7 +511,7 @@ static int validate_change(struct cpuset
> * tasks.
> */
> ret = -EBUSY;
> - if (is_cpu_exclusive(cur) &&
> + if (is_cpu_exclusive(cur) && !cpumask_empty(cur->cpus_allowed) &&
> !cpuset_cpumask_can_shrink(cur->cpus_allowed,
> trial->cpus_allowed))
> goto out;
>
We should instead fix cpuset_cpumask_can_shrink() to check if the return value of
cpumask_any() >= nr_cpu_ids.
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [patch] cpuset: fix crash when adding CPUs to an empty set
2015-01-28 2:41 ` Zefan Li
@ 2015-01-28 3:53 ` Mike Galbraith
2015-01-28 4:24 ` Zefan Li
2015-01-28 14:33 ` [tip:sched/urgent] sched: Fix crash if cpuset_cpumask_can_shrink( ) is passed an empty cpumask tip-bot for Mike Galbraith
0 siblings, 2 replies; 7+ messages in thread
From: Mike Galbraith @ 2015-01-28 3:53 UTC (permalink / raw)
To: Zefan Li; +Cc: Peter Zijlstra, LKML
On Wed, 2015-01-28 at 10:41 +0800, Zefan Li wrote:
> > ---
> > kernel/cpuset.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > --- a/kernel/cpuset.c
> > +++ b/kernel/cpuset.c
> > @@ -511,7 +511,7 @@ static int validate_change(struct cpuset
> > * tasks.
> > */
> > ret = -EBUSY;
> > - if (is_cpu_exclusive(cur) &&
> > + if (is_cpu_exclusive(cur) && !cpumask_empty(cur->cpus_allowed) &&
> > !cpuset_cpumask_can_shrink(cur->cpus_allowed,
> > trial->cpus_allowed))
> > goto out;
> >
>
> We should instead fix cpuset_cpumask_can_shrink() to check if the return value of
> cpumask_any() >= nr_cpu_ids.
I like 0 lines better, but ok.
sched: Fix crash if cpuset_cpumask_can_shrink() is passed an empty cpumask
While creating an exclusive cpuset, we passed cpuset_cpumask_can_shrink()
an empty cpumask (cur), and dl_bw_of(cpumask_any(cur)) made boom with it.
[ 514.513841] CPU: 0 PID: 6942 Comm: shield.sh Not tainted 3.19.0-master #19
[ 514.513841] Hardware name: MEDIONPC MS-7502/MS-7502, BIOS 6.00 PG 12/26/2007
[ 514.513841] task: ffff880224552450 ti: ffff8800caab8000 task.ti: ffff8800caab8000
[ 514.513841] RIP: 0010:[<ffffffff81073846>] [<ffffffff81073846>] cpuset_cpumask_can_shrink+0x56/0xb0
[ 514.513841] RSP: 0018:ffff8800caabbda8 EFLAGS: 00010202
[ 514.513841] RAX: 0000ffff00000000 RBX: ffff880037ae2ab8 RCX: 0000000000000000
[ 514.513841] RDX: 0000000000012900 RSI: 0000000000000000 RDI: 000000000000000c
[ 514.513841] RBP: ffff8800caabbdc8 R08: ffff880037ae2ab8 R09: 0000000000000034
[ 514.513841] R10: 00000077e6fd3d1a R11: ffff88022e9b301c R12: ffff880223c98ab8
[ 514.513841] R13: ffff880037ae2a00 R14: 0000000000000004 R15: ffff8802254b3c60
[ 514.513841] FS: 00007fdbab533700(0000) GS:ffff88022fc00000(0000) knlGS:0000000000000000
[ 514.513841] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 514.513841] CR2: 00007ffff8ab8000 CR3: 00000000bef11000 CR4: 00000000000007f0
[ 514.513841] Stack:
[ 514.513841] ffff880223c98ab8 ffffffff81a46c20 ffff880223c98a00 ffff880037ae2a00
[ 514.513841] ffff8800caabbdf8 ffffffff810cb82a ffff8800caabbdf8 ffff880037ae2a00
[ 514.513841] ffff8800ca9e5240 0000000000000000 ffff8800caabbe48 ffffffff810cc877
[ 514.513841] Call Trace:
[ 514.513841] [<ffffffff810cb82a>] validate_change+0x18a/0x200
[ 514.513841] [<ffffffff810cc877>] cpuset_write_resmask+0x3b7/0x720
[ 514.513841] [<ffffffff810c4d58>] cgroup_file_write+0x38/0x100
[ 514.513841] [<ffffffff811d953a>] kernfs_fop_write+0x12a/0x180
[ 514.513841] [<ffffffff8116e1a3>] vfs_write+0xb3/0x1d0
[ 514.513841] [<ffffffff8116ed06>] SyS_write+0x46/0xb0
[ 514.513841] [<ffffffff8159ced6>] system_call_fastpath+0x16/0x1b
Signed-off-by: Mike Galbraith <umgwanakikbuti@gmail.com>
---
kernel/sched/core.c | 3 +++
1 file changed, 3 insertions(+)
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4739,6 +4739,9 @@ int cpuset_cpumask_can_shrink(const stru
struct dl_bw *cur_dl_b;
unsigned long flags;
+ if (!cpumask_weight(cur))
+ return ret;
+
rcu_read_lock_sched();
cur_dl_b = dl_bw_of(cpumask_any(cur));
trial_cpus = cpumask_weight(trial);
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [patch] cpuset: fix crash when adding CPUs to an empty set
2015-01-28 3:53 ` Mike Galbraith
@ 2015-01-28 4:24 ` Zefan Li
2015-01-28 11:53 ` Peter Zijlstra
2015-01-28 14:33 ` [tip:sched/urgent] sched: Fix crash if cpuset_cpumask_can_shrink( ) is passed an empty cpumask tip-bot for Mike Galbraith
1 sibling, 1 reply; 7+ messages in thread
From: Zefan Li @ 2015-01-28 4:24 UTC (permalink / raw)
To: Mike Galbraith; +Cc: Peter Zijlstra, LKML, Ingo Molnar
Cc: Ingo
Cc: Juri
On 2015/1/28 11:53, Mike Galbraith wrote:
> On Wed, 2015-01-28 at 10:41 +0800, Zefan Li wrote:
>
>>> ---
>>> kernel/cpuset.c | 2 +-
>>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> --- a/kernel/cpuset.c
>>> +++ b/kernel/cpuset.c
>>> @@ -511,7 +511,7 @@ static int validate_change(struct cpuset
>>> * tasks.
>>> */
>>> ret = -EBUSY;
>>> - if (is_cpu_exclusive(cur) &&
>>> + if (is_cpu_exclusive(cur) && !cpumask_empty(cur->cpus_allowed) &&
>>> !cpuset_cpumask_can_shrink(cur->cpus_allowed,
>>> trial->cpus_allowed))
>>> goto out;
>>>
>>
>> We should instead fix cpuset_cpumask_can_shrink() to check if the return value of
>> cpumask_any() >= nr_cpu_ids.
>
> I like 0 lines better, but ok.
>
> sched: Fix crash if cpuset_cpumask_can_shrink() is passed an empty cpumask
>
> While creating an exclusive cpuset, we passed cpuset_cpumask_can_shrink()
> an empty cpumask (cur), and dl_bw_of(cpumask_any(cur)) made boom with it.
>
> [ 514.513841] CPU: 0 PID: 6942 Comm: shield.sh Not tainted 3.19.0-master #19
> [ 514.513841] Hardware name: MEDIONPC MS-7502/MS-7502, BIOS 6.00 PG 12/26/2007
> [ 514.513841] task: ffff880224552450 ti: ffff8800caab8000 task.ti: ffff8800caab8000
> [ 514.513841] RIP: 0010:[<ffffffff81073846>] [<ffffffff81073846>] cpuset_cpumask_can_shrink+0x56/0xb0
> [ 514.513841] RSP: 0018:ffff8800caabbda8 EFLAGS: 00010202
> [ 514.513841] RAX: 0000ffff00000000 RBX: ffff880037ae2ab8 RCX: 0000000000000000
> [ 514.513841] RDX: 0000000000012900 RSI: 0000000000000000 RDI: 000000000000000c
> [ 514.513841] RBP: ffff8800caabbdc8 R08: ffff880037ae2ab8 R09: 0000000000000034
> [ 514.513841] R10: 00000077e6fd3d1a R11: ffff88022e9b301c R12: ffff880223c98ab8
> [ 514.513841] R13: ffff880037ae2a00 R14: 0000000000000004 R15: ffff8802254b3c60
> [ 514.513841] FS: 00007fdbab533700(0000) GS:ffff88022fc00000(0000) knlGS:0000000000000000
> [ 514.513841] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 514.513841] CR2: 00007ffff8ab8000 CR3: 00000000bef11000 CR4: 00000000000007f0
> [ 514.513841] Stack:
> [ 514.513841] ffff880223c98ab8 ffffffff81a46c20 ffff880223c98a00 ffff880037ae2a00
> [ 514.513841] ffff8800caabbdf8 ffffffff810cb82a ffff8800caabbdf8 ffff880037ae2a00
> [ 514.513841] ffff8800ca9e5240 0000000000000000 ffff8800caabbe48 ffffffff810cc877
> [ 514.513841] Call Trace:
> [ 514.513841] [<ffffffff810cb82a>] validate_change+0x18a/0x200
> [ 514.513841] [<ffffffff810cc877>] cpuset_write_resmask+0x3b7/0x720
> [ 514.513841] [<ffffffff810c4d58>] cgroup_file_write+0x38/0x100
> [ 514.513841] [<ffffffff811d953a>] kernfs_fop_write+0x12a/0x180
> [ 514.513841] [<ffffffff8116e1a3>] vfs_write+0xb3/0x1d0
> [ 514.513841] [<ffffffff8116ed06>] SyS_write+0x46/0xb0
> [ 514.513841] [<ffffffff8159ced6>] system_call_fastpath+0x16/0x1b
>
> Signed-off-by: Mike Galbraith <umgwanakikbuti@gmail.com>
>
Acked-by: Zefan Li <lizefan@huawei.com>
This fixes f82f80426f7afcf55953924e71555984a4bd6ce6
("sched/deadline: Ensure that updates to exclusive cpusets don't break AC").
> ---
> kernel/sched/core.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -4739,6 +4739,9 @@ int cpuset_cpumask_can_shrink(const stru
> struct dl_bw *cur_dl_b;
> unsigned long flags;
>
> + if (!cpumask_weight(cur))
> + return ret;
> +
> rcu_read_lock_sched();
> cur_dl_b = dl_bw_of(cpumask_any(cur));
> trial_cpus = cpumask_weight(trial);
>
>
> .
>
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [patch] cpuset: fix crash when adding CPUs to an empty set
2015-01-28 4:24 ` Zefan Li
@ 2015-01-28 11:53 ` Peter Zijlstra
2015-01-28 12:03 ` Mike Galbraith
0 siblings, 1 reply; 7+ messages in thread
From: Peter Zijlstra @ 2015-01-28 11:53 UTC (permalink / raw)
To: Zefan Li; +Cc: Mike Galbraith, LKML, Ingo Molnar
On Wed, Jan 28, 2015 at 12:24:52PM +0800, Zefan Li wrote:
> > sched: Fix crash if cpuset_cpumask_can_shrink() is passed an empty cpumask
> >
> > While creating an exclusive cpuset, we passed cpuset_cpumask_can_shrink()
> > an empty cpumask (cur), and dl_bw_of(cpumask_any(cur)) made boom with it.
> >
Is this the case where a new cpuset doesn't yet have CPUs assigned?
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [patch] cpuset: fix crash when adding CPUs to an empty set
2015-01-28 11:53 ` Peter Zijlstra
@ 2015-01-28 12:03 ` Mike Galbraith
0 siblings, 0 replies; 7+ messages in thread
From: Mike Galbraith @ 2015-01-28 12:03 UTC (permalink / raw)
To: Peter Zijlstra; +Cc: Zefan Li, LKML, Ingo Molnar
On Wed, 2015-01-28 at 12:53 +0100, Peter Zijlstra wrote:
> On Wed, Jan 28, 2015 at 12:24:52PM +0800, Zefan Li wrote:
> > > sched: Fix crash if cpuset_cpumask_can_shrink() is passed an empty cpumask
> > >
> > > While creating an exclusive cpuset, we passed cpuset_cpumask_can_shrink()
> > > an empty cpumask (cur), and dl_bw_of(cpumask_any(cur)) made boom with it.
> > >
>
> Is this the case where a new cpuset doesn't yet have CPUs assigned?
Yes.
-Mike
^ permalink raw reply [flat|nested] 7+ messages in thread
* [tip:sched/urgent] sched: Fix crash if cpuset_cpumask_can_shrink( ) is passed an empty cpumask
2015-01-28 3:53 ` Mike Galbraith
2015-01-28 4:24 ` Zefan Li
@ 2015-01-28 14:33 ` tip-bot for Mike Galbraith
1 sibling, 0 replies; 7+ messages in thread
From: tip-bot for Mike Galbraith @ 2015-01-28 14:33 UTC (permalink / raw)
To: linux-tip-commits
Cc: tglx, umgwanakikbuti, lizefan, peterz, mingo, linux-kernel, hpa,
torvalds
Commit-ID: bb2bc55a694d45cdeda91b6f28ab2adec28125ef
Gitweb: http://git.kernel.org/tip/bb2bc55a694d45cdeda91b6f28ab2adec28125ef
Author: Mike Galbraith <umgwanakikbuti@gmail.com>
AuthorDate: Wed, 28 Jan 2015 04:53:55 +0100
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Wed, 28 Jan 2015 15:28:15 +0100
sched: Fix crash if cpuset_cpumask_can_shrink() is passed an empty cpumask
While creating an exclusive cpuset, we passed cpuset_cpumask_can_shrink()
an empty cpumask (cur), and dl_bw_of(cpumask_any(cur)) made boom with it:
CPU: 0 PID: 6942 Comm: shield.sh Not tainted 3.19.0-master #19
Hardware name: MEDIONPC MS-7502/MS-7502, BIOS 6.00 PG 12/26/2007
task: ffff880224552450 ti: ffff8800caab8000 task.ti: ffff8800caab8000
RIP: 0010:[<ffffffff81073846>] [<ffffffff81073846>] cpuset_cpumask_can_shrink+0x56/0xb0
[...]
Call Trace:
[<ffffffff810cb82a>] validate_change+0x18a/0x200
[<ffffffff810cc877>] cpuset_write_resmask+0x3b7/0x720
[<ffffffff810c4d58>] cgroup_file_write+0x38/0x100
[<ffffffff811d953a>] kernfs_fop_write+0x12a/0x180
[<ffffffff8116e1a3>] vfs_write+0xb3/0x1d0
[<ffffffff8116ed06>] SyS_write+0x46/0xb0
[<ffffffff8159ced6>] system_call_fastpath+0x16/0x1b
Signed-off-by: Mike Galbraith <umgwanakikbuti@gmail.com>
Acked-by: Zefan Li <lizefan@huawei.com>
Fixes: f82f80426f7a ("sched/deadline: Ensure that updates to exclusive cpusets don't break AC")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/1422417235.5716.5.camel@marge.simpson.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
kernel/sched/core.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index c0accc0..5c86687 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4642,6 +4642,9 @@ int cpuset_cpumask_can_shrink(const struct cpumask *cur,
struct dl_bw *cur_dl_b;
unsigned long flags;
+ if (!cpumask_weight(cur))
+ return ret;
+
rcu_read_lock_sched();
cur_dl_b = dl_bw_of(cpumask_any(cur));
trial_cpus = cpumask_weight(trial);
^ permalink raw reply related [flat|nested] 7+ messages in thread
end of thread, other threads:[~2015-01-29 1:58 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2015-01-21 6:16 [patch] cpuset: fix crash when adding CPUs to an empty set Mike Galbraith
2015-01-28 2:41 ` Zefan Li
2015-01-28 3:53 ` Mike Galbraith
2015-01-28 4:24 ` Zefan Li
2015-01-28 11:53 ` Peter Zijlstra
2015-01-28 12:03 ` Mike Galbraith
2015-01-28 14:33 ` [tip:sched/urgent] sched: Fix crash if cpuset_cpumask_can_shrink( ) is passed an empty cpumask tip-bot for Mike Galbraith
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