Commit 66d485b4 authored by Paul Mundt's avatar Paul Mundt
Browse files

sh: Bump up ARCH_KMALLOC_MINALIGN for DMA cases.


Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent eddeeb32
......@@ -138,22 +138,18 @@ typedef struct { unsigned long pgd; } pgd_t;
#endif
/*
* Slub defaults to 8-byte alignment, we're only interested in 4.
* Slab defaults to BYTES_PER_WORD, which ends up being the same anyways.
* Some drivers need to perform DMA into kmalloc'ed buffers
* and so we have to increase the kmalloc minalign for this.
*/
#ifdef CONFIG_SUPERH32
#define ARCH_KMALLOC_MINALIGN 4
#define ARCH_SLAB_MINALIGN 4
#else
/* If gcc inlines memset, it will use st.q instructions. Therefore, we need
kmalloc allocations to be 8-byte aligned. Without this, the alignment
becomes BYTE_PER_WORD i.e. only 4 (since sizeof(long)==sizeof(void*)==4 on
sh64 at the moment). */
#define ARCH_KMALLOC_MINALIGN 8
#define ARCH_KMALLOC_MINALIGN L1_CACHE_BYTES
#ifdef CONFIG_SUPERH64
/*
* We want 8-byte alignment for the slab caches as well, otherwise we have
* the same BYTES_PER_WORD (sizeof(void *)) min align in kmem_cache_create().
* While BYTES_PER_WORD == 4 on the current sh64 ABI, GCC will still
* happily generate {ld/st}.q pairs, requiring us to have 8-byte
* alignment to avoid traps. The kmalloc alignment is gauranteed by
* virtue of L1_CACHE_BYTES, requiring this to only be special cased
* for slab caches.
*/
#define ARCH_SLAB_MINALIGN 8
#endif
......
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