22 Jan
2021
22 Jan
'21
5:06 p.m.
On 2021/1/21 21:52, Jason Gunthorpe wrote:
On Thu, Jan 21, 2021 at 01:48:56PM +0000, liweihang wrote:
On 2021/1/21 21:36, Jason Gunthorpe wrote:
On Thu, Jan 21, 2021 at 01:33:42PM +0000, liweihang wrote:
We need to allocate memory while spin_lock is hold, how about using GFP_KERNEL or GFP_NOWAIT?
You should try hard not to do that. Convert he spinlock to a mutex, for instance.
Jason
But what if some kernel users call ib_post_send() when holding a spinlock?
I doubt extensions like this would be part of kernel verbs..
Does any ULP call ib_post_send under lock? I'm not sure that is valid.
Jason
I didn't find such a ULP calling ib_post_send in a spinlock either. Anyway, I will use GFP_NOWAIT instead of GFP_ATOMIC.
Thanks Weihang