[PATCH v3] mtd: cfi: reduce stack size

[Brian Norris]

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 at arndb.de>
> ---
> v3: more whitespace changes
> v2: whitespace changes

Applied to l2-mtd.git. Thanks!

Brian