Re: [RFC] Templates and tweaks (for size performance and more)

[Russell King <rmk@arm.linux.org.uk>]

On Thu, Nov 07, 2002 at 12:09:10PM -0700, Tom Rini wrote:
> The following is vs current 2.5 BK and has been lightly tested on PPC
> (and compiled on i386).  This creates the default files for all current
> arches, and adapts ARM and ia64 as well to show how to override a
> generic param with an arch-specific one (and removes
> CONFIG_FORCE_MAX_ZONEORDER).

This isn't a "tweak" on ARM as in a user-adjustable value.  It needs to
specifically be reduced to prevent things from blowing up.

So, when SA1111-type machines are selected, the max zone order _must_
(no ifs or buts) be set to 9 or below.

> +/* This is the number of free areas per zone to manage, but the max
> + * number determines the maximum order of a page allocation request
> + * as well. */
> +/* Default: 11 */
> +#if defined(ASSABET_NEPONSET0) || defined(SA1100_ADSBITSY) || 		\
> +	defined(SA1100_BADGE4) || defined(SA1100_CONSUS) || 		\
> +	defined(SA1100_GRAPHICSMASTER) || defined(SA1100_JORNADA720) ||	\
> +	defined(ARCH_LUBBOCK) || defined(SA1100_PFS168) ||		\
> +	defined(SA1100_PT_SYSTEM3) || defined(SA1100_XP860)
> +#undef TWEAK_MAX_ORDER
> +#define TWEAK_MAX_ORDER		9
> +#endif

And the reason we have it in the configuration rather than the code is
to get rid of crap like the above.

-- 
Russell King (rmk@arm.linux.org.uk)                The developer of ARM Linux
             http://www.arm.linux.org.uk/personal/aboutme.html