2021-09-14 23:56:59

by Matteo Croce

[permalink] [raw]
Subject: [PATCH bpf-next v2] bpf: update bpf_get_smp_processor_id() documentation

From: Matteo Croce <[email protected]>

BPF programs run with migration disabled regardless of preemption, as
they are protected by migrate_disable().
Update the documentation accordingly.

Signed-off-by: Matteo Croce <[email protected]>
---
include/uapi/linux/bpf.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index d21326558d42..3e9785f1064a 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -1629,7 +1629,7 @@ union bpf_attr {
* u32 bpf_get_smp_processor_id(void)
* Description
* Get the SMP (symmetric multiprocessing) processor id. Note that
- * all programs run with preemption disabled, which means that the
+ * all programs run with migration disabled, which means that the
* SMP processor id is stable during all the execution of the
* program.
* Return
--
2.31.1


2021-09-15 00:10:51

by Yonghong Song

[permalink] [raw]
Subject: Re: [PATCH bpf-next v2] bpf: update bpf_get_smp_processor_id() documentation



On 9/14/21 4:54 PM, Matteo Croce wrote:
> From: Matteo Croce <[email protected]>
>
> BPF programs run with migration disabled regardless of preemption, as
> they are protected by migrate_disable().
> Update the documentation accordingly.
>
> Signed-off-by: Matteo Croce <[email protected]>

Acked-by: Yonghong Song <[email protected]>

2021-09-15 20:46:44

by Daniel Borkmann

[permalink] [raw]
Subject: Re: [PATCH bpf-next v2] bpf: update bpf_get_smp_processor_id() documentation

On 9/15/21 2:07 AM, Yonghong Song wrote:
> On 9/14/21 4:54 PM, Matteo Croce wrote:
>> From: Matteo Croce <[email protected]>
>>
>> BPF programs run with migration disabled regardless of preemption, as
>> they are protected by migrate_disable().
>> Update the documentation accordingly.
>>
>> Signed-off-by: Matteo Croce <[email protected]>
>
> Acked-by: Yonghong Song <[email protected]>

Applied, thanks & also copied this over to the tools/include/uapi/linux/bpf.h .