[PATCH v7 01/17] mm/slab: Decouple ARCH_KMALLOC_MINALIGN from ARCH_DMA_MINALIGN

[Vlastimil Babka]

On 6/12/23 17:31, Catalin Marinas wrote:
> In preparation for supporting a kmalloc() minimum alignment smaller than
> the arch DMA alignment, decouple the two definitions. This requires that
> either the kmalloc() caches are aligned to a (run-time) cache-line size
> or the DMA API bounces unaligned kmalloc() allocations. Subsequent
> patches will implement both options.
> 
> After this patch, ARCH_DMA_MINALIGN is expected to be used in static
> alignment annotations and defined by an architecture to be the maximum
> alignment for all supported configurations/SoCs in a single Image.
> Architectures opting in to a smaller ARCH_KMALLOC_MINALIGN will need to
> define its value in the arch headers.
> 
> Since ARCH_DMA_MINALIGN is now always defined, adjust the #ifdef in
> dma_get_cache_alignment() so that there is no change for architectures
> not requiring a minimum DMA alignment.
> 
> Signed-off-by: Catalin Marinas <catalin.marinas at arm.com>
> Cc: Andrew Morton <akpm at linux-foundation.org>
> Cc: Vlastimil Babka <vbabka at suse.cz>
> Cc: Christoph Hellwig <hch at lst.de>
> Cc: Robin Murphy <robin.murphy at arm.com>
> Tested-by: Isaac J. Manjarres <isaacmanjarres at google.com>

Acked-by: Vlastimil Babka <vbabka at suse.cz>