linux-kernel - Re: [PATCH 06/28] ata: use COMMAND_LINE_SIZE for ata_force_param

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Date:   Wed, 29 Jan 2020 09:18:19 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Cc:     Jens Axboe <axboe@...nel.dk>,
        Michael Schmitz <schmitzmic@...il.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/28] ata: use COMMAND_LINE_SIZE for
 ata_force_param_buf[] size

On Tue, Jan 28, 2020 at 02:33:21PM +0100, Bartlomiej Zolnierkiewicz wrote:
> Use COMMAND_LINE_SIZE instead PAGE_SIZE for ata_force_param_buf[]
> size as libata parameters buffer doesn't need to be bigger than
> the command line buffer.
> 
> For many architectures this results in decreased libata-core.o
> size (COMMAND_LINE_SIZE varies from 256 to 4096 while the minimum
> PAGE_SIZE is 4096).
> 
> Code size savings on m68k arch using atari_defconfig:
> 
>    text    data     bss     dec     hex filename
> before:
>   41064    4413      40   45517    b1cd drivers/ata/libata-core.o
> after:
>   41064     573      40   41677    a2cd drivers/ata/libata-core.o
> 
> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>

This looks like a good start, so:

Reviewed-by: Christoph Hellwig <hch@....de>

But evne COMMAND_LINE_SIZE is quite a lot of overhead.  Can we maybe add
a new Kconfig option to optionally disable the libata.force= entirely?