[U-Boot] Make kmalloc'ed memory really DMA-safe

[Tom Rini]

On Fri, Aug 24, 2018 at 07:30:15PM +0900, Masahiro Yamada wrote:

> In Linux, the memory returned by kmalloc() is DMA-capable.
> However, it is not true in U-Boot.
> 
> At a glance, kmalloc() in U-Boot returns address aligned with
> ARCH_DMA_MINALIGN.  However, it never pads the allocated memory.
> This half-way house is completely useless because calling kmalloc()
> and malloc() in this order causes a cache sharing problem.
> 
> Change the implementation to call malloc_cache_aligned(), which
> allocates really DMA-capable memory.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro at socionext.com>

Applied to u-boot/master, thanks!

-- 
Tom
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