From mboxrd@z Thu Jan  1 00:00:00 1970
From: computersforpeace@gmail.com (Brian Norris)
Date: Wed, 11 Mar 2015 16:49:45 -0700
Subject: [PATCH v3] mtd: cfi: reduce stack size
In-Reply-To: <2266200.3mx7btcFe5@wuerfel>
References: <2266200.3mx7btcFe5@wuerfel>
Message-ID: <20150311234945.GG32500@ld-irv-0074>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Tue, Mar 10, 2015 at 05:48:37PM +0100, Arnd Bergmann wrote:
> The cfi_staa_write_buffers function uses a large amount of kernel stack
> whenever CONFIG_MTD_MAP_BANK_WIDTH_32 is set, and that results in a
> warning on ARM allmodconfig builds:
> 
> drivers/mtd/chips/cfi_cmdset_0020.c: In function 'cfi_staa_write_buffers':
> drivers/mtd/chips/cfi_cmdset_0020.c:651:1: warning: the frame size of 1208 bytes is larger than 1024 bytes [-Wframe-larger-than=]
> 
> It turns out that this is largely a result of a suboptimal implementation
> of map_word_andequal(). Replacing this function with a straightforward
> one reduces the stack size in this function by exactly 200 bytes,
> shrinks the .text segment for this file from 27648 bytes to 26608 bytes,
> and makes the warning go away.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
> v3: more whitespace changes
> v2: whitespace changes

Applied to l2-mtd.git. Thanks!

Brian