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From: Muchun Song Mime-Version: 1.0 Subject: Re: [PATCH 1/1] hugetlb: fix CONFIG_PADATA dependency for non-SMP system Message-Id: <86B96EE5-A51C-4F06-BB18-0B3B12DBCCEC@linux.dev> Date: Thu, 8 Feb 2024 10:39:13 +0800 Cc: Gang Li , Andrew Morton , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Randy Dunlap , kernel test robot To: Gang Li X-Migadu-Flow: FLOW_OUT X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: A085E20014 X-Stat-Signature: ys7d38qndw8mr9p17wzs4j6yfqm87dfz X-HE-Tag: 1707359990-764884 X-HE-Meta: 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: =EF=BB=BF > On Feb 5, 2024, at 16:08, Gang Li wrote: >=20 > =EF=BB=BFOn 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. >=20 > PADATA consists of two distinct functionality: >=20 > 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`. OK. Since all users of PADATA of non-SMP case currently only use padata_do_m= ultithreaded, it=E2=80=99s possible and easy to implement a variant of that i= n non-SMP case. It is not necessary to implement another functionality unles= s the only user of crypto/pcrypt.c does not depend on SMP in the future, at l= east now it=E2=80=99s dependent on SMP. Thanks. >=20 > 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 > ```