linux-kernel - Re: [PATCH] ubi: fastmap: Check each mapping only once

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Date:   Thu, 29 Nov 2018 09:09:23 +0100
From:   Greg KH <greg@...ah.com>
To:     Martin Kepplinger <martin.kepplinger@...zinger.com>
Cc:     stable@...r.kernel.org, dedekind1@...il.com, richard@....at,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ubi: fastmap: Check each mapping only once

On Mon, Nov 26, 2018 at 11:38:42AM +0100, Martin Kepplinger wrote:
> From: Richard Weinberger <richard@....at>
> 
> [ Upstream commit 34653fd8c46e771585fce5975e4243f8fd401914 ]
> 
> This commit got merged along with commit 781932375ffc
> ("ubi: fastmap: Correctly handle interrupted erasures in EBA") upstream but
> only the latter has been applied to stable v4.14.54 as commit a23cf10d9abb.
> This resulted in a performance regression. Startup on i.MX platforms is
> delayed for up to a few seconds depending on the platform.
> This fixes ubi fastmap to be of the same performance as it has been before
> said fastmap changes.
> 
> Fixes: a23cf10d9abb ("ubi: fastmap: Correctly handle interrupted erasures in EBA")
> Signed-off-by: Richard Weinberger <richard@....at>
> Signed-off-by: Martin Kepplinger <martin.kepplinger@...zinger.com>
> ---
> 
> Richard, although this fixes a major slowdown regression in -stable, do you
> consider this "stable" too?
> 
> This applies and is tested only for the 4.14 stable tree. It seems to be
> equally relevant for 4.9 and 4.4 though.

Now queued up for 4.14.y, thanks.

greg k-h