[PATCH] ARM: setup_mm_for_reboot(): use flush_cache_louis()

[santosh.shilimkar@ti.com (Santosh Shilimkar)]

On Tuesday 06 November 2012 03:12 PM, Nicolas Pitre wrote:
>
> ... instead of flush_cache_all().  The later unconditionally flushes
> the L2 cache on ARMv7 architectures such as Cortex A15 and A7 which
> is costly and unnecessary in some scenarios where setup_mm_for_reboot()
> is used.  If L2 has to be flushed as well, it should already be done
> separately on other architectures anyway.
>
> Signed-off-by: Nicolas Pitre <nico@linaro.org>
>
> diff --git a/arch/arm/mm/idmap.c b/arch/arm/mm/idmap.c
> index ab88ed4f8e..2c61085a10 100644
> --- a/arch/arm/mm/idmap.c
> +++ b/arch/arm/mm/idmap.c
> @@ -104,7 +104,7 @@ early_initcall(init_static_idmap);
>   void setup_mm_for_reboot(void)
>   {
>   	/* Clean and invalidate L1. */
> -	flush_cache_all();
> +	flush_cache_louis();
>
>   	/* Switch to the identity mapping. */
>   	cpu_switch_mm(idmap_pgd, &init_mm);
>
Nice. Just one difference is that the I-cache invalidation won't
happen with this change. Not that it is needed here but capturing
that in change-log would be good.

Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>