From mboxrd@z Thu Jan  1 00:00:00 1970
From: Scott Wood <scottwood@freescale.com>
Date: Thu, 15 Mar 2012 14:29:03 -0500
Subject: [U-Boot] [PATCH v4 16/27] Add spl load feature
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	<1331777784-8528-17-git-send-email-sjg@chromium.org>
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On 03/14/2012 09:16 PM, Simon Glass wrote:
> +#ifdef CONFIG_SPL_BUILD
> +static int reserve_stacks_spl(void)
> +{
> +	/* Why not -= ? */
> +	gd->dest_addr_sp += 128;	/* leave 32 words for abort-stack */
> +	gd->irq_sp = gd->dest_addr_sp;
> +	return 0;
> +}
> +#endif

Please explain what's going on here, and why it's suitable for all (or
at least most) SPLs.

And answer your own question about "Why not -=". :-)

-Scott