linux-kernel - Re: [PATCH 1/7] ubi: block: Refactor sg list processing for highmem

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Date:   Fri, 11 Aug 2023 10:34:52 +0200 (CEST)
From:   Richard Weinberger <richard@....at>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     linux-mtd <linux-mtd@...ts.infradead.org>,
        Stephan Wurm <stephan.wurm@...berle.de>,
        stable <stable@...r.kernel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Oliver Neukum <oliver@...kum.org>,
        Ali Akcaagac <aliakc@....de>,
        Jamie Lenehan <lenehan@...bble.org>,
        James Bottomley <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-scsi <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH 1/7] ubi: block: Refactor sg list processing for highmem

----- Ursprüngliche Mail -----
> Von: "Christoph Hellwig" <hch@...radead.org>
> On Thu, Aug 10, 2023 at 09:54:46PM +0200, Richard Weinberger wrote:
>> > But why add the bounce buffering first if you can avoid it from the
>> > very beginning by just using kmap_local instead of adding a new
>> > caller for the deprecate kmap_atomic?
>> 
>> Because I want this fix also in all stable trees. kmap_local() is rather
>> new. When back porting patch 1/7, bounce buffers and kmap_atomic()
>> are needed anyway.
>> By doing this in patch 1/7 I avoid backport troubles and keep the
>> delta between upstream and stable trees minimal.
> 
> Just use plain kmap for the historic backports.

Hm, yes. For UBIblock kmap should be too expensive.

Thanks,
//richard