linux-kernel - Re: [PATCH] scsi: ipr: Replace kmap() with kmap_local

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Message-Id: <167478863297.3972592.6852323055045197958.b4-ty@oracle.com>
Date:   Thu, 26 Jan 2023 22:22:56 -0500
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Brian King <brking@...ibm.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Fabio M. De Francesco" <fmdefrancesco@...il.com>
Cc:     "Martin K . Petersen" <martin.petersen@...cle.com>,
        Ira Weiny <ira.weiny@...el.com>
Subject: Re: [PATCH] scsi: ipr: Replace kmap() with kmap_local_page()

On Tue, 03 Jan 2023 19:25:56 +0100, Fabio M. De Francesco wrote:

> The use of kmap() is deprecated in favor of kmap_local_page().
> 
> There are two main problems with kmap(): (1) It comes with an overhead as
> the mapping space is restricted and protected by a global lock for
> synchronization and (2) it also requires global TLB invalidation when the
> kmap’s pool wraps and it might block when the mapping space is fully
> utilized until a slot becomes available.
> 
> [...]

Applied to 6.3/scsi-queue, thanks!

[1/1] scsi: ipr: Replace kmap() with kmap_local_page()
      https://git.kernel.org/mkp/scsi/c/a3e2e248fd77

-- 
Martin K. Petersen	Oracle Linux Engineering