Re: [PATCHv5 3/5] ext4: mballoc: Introduce pcpu seqcnt for freeing PA to improve ENOSPC handling

[Borislav Petkov]

On Wed, Jun 03, 2020 at 03:40:16PM +0530, Ritesh Harjani wrote:
> Yes, this is being discussed in the community.
> I have submitted a patch which should help fix this warning msg.
> Feel free to give this a try on your setup.
> 
> https://marc.info/?l=linux-ext4&m=159110574414645&w=2

I just triggered the same thing here too. Looking at your fix and not
even pretending to know what's going on with that percpu sequence
counting, I can't help but wonder why do you wanna do:

	seq = *raw_cpu_ptr(&discard_pa_seq);

instead of simply doing:

	seq = this_cpu_read(discard_pa_seq);

?

-- 
Regards/Gruss,
    Boris.

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