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

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Message-ID: <298860961.5257332.1691684136772.JavaMail.zimbra@nod.at>
Date:   Thu, 10 Aug 2023 18:15:36 +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>
>> Refactor ubi_eba_read_leb_sg() to use kmap_atomic() for sg list
>> access.
>> Since kmap_atomic() disables preempt a bounce buffer is needed.
>> kmap_local_page() is not used to allow easy backporting of this patch
>> to older kernels.
>> 
>> The followup patches in this series will switch to kmap_sg()
>> and we can remove our own helper and the bounce buffer.
> 
> Please just use kmap_local and avoid the bounce buffering.

Patch 6 does this.

Thanks,
//richard