linux-kernel - Re: [PATCH] libata-eh: Use switch() instead of sparse array for protocol strings

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Date:   Mon, 9 Jan 2017 09:22:07 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Tejun Heo <tj@...nel.org>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        "linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] libata-eh: Use switch() instead of sparse array for
 protocol strings

On Mon, Jan 09, 2017 at 08:21:43AM -0800, Christoph Hellwig wrote:
> Having it global is kinda weird anyway.  But looking the code none
> of the commands actually using is in the paging path, so it could
> simply be replaced with a dynamic allocation in ata_scsi_rbuf_fill
> for the actually needed size, which often will be very small,
> or sometimes even 0.

Prototype here, only tested with a simple mkfs.xfs and some I/O on
AHCI so far:

http://git.infradead.org/users/hch/block.git/shortlog/refs/heads/libata-kill-ata_scsi_rbuf