linux-kernel - Re: [PATCH 1/1] hugetlb: fix CONFIG_PADATA dependency for non-SMP system

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Date: Mon, 5 Feb 2024 16:08:37 +0800
From: Gang Li <gang.li@...ux.dev>
To: Muchun Song <muchun.song@...ux.dev>
Cc: Gang Li <ligang.bdlg@...edance.com>,
 Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org,
 linux-mm@...ck.org, Randy Dunlap <rdunlap@...radead.org>,
 kernel test robot <lkp@...el.com>
Subject: Re: [PATCH 1/1] hugetlb: fix CONFIG_PADATA dependency for non-SMP
 system

On 2024/2/5 15:37, Muchun Song wrote:
> Actually, I did not get it. Why the above code cannot work? The above
> code already make it serialized in one call, right? What do I miss here?
> 
> Thanks.
> 

PADATA consists of two distinct functionality:

One part is `padata_do_multithreaded`, which disregards
order and simply divides tasks into several groups for parallel
execution. My patch use `padata_do_multithreaded`.

The other part is composed of a set of APIs that, while handling data in
an out-of-order parallel manner, can eventually return the data with
ordered sequence. Only `crypto/pcrypt.c` use them. I guess these APIs
are designed specifically for `crypto/pcrypt.c`.
```
padata_alloc
padata_alloc_shell
padata_do_parallel
padata_do_serial
padata_free_shell
padata_free
```