Messages in this thread | | | Date | Mon, 9 Jul 2018 16:49:25 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH v3] devres: Explicitly align datai[] to 64-bit |
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On Mon, Jul 09, 2018 at 02:33:26PM +0000, Alexey Brodkin wrote: > > In fact, since alloc_dr() uses kmalloc() to allocate the entire thing, > > it is impossible to guarantee a larger alignment than kmalloc does. > > Well but 4-bytes [which is critical for atomic64_t] should be much less > than a sane cache line length so above should work.
AFAICT ARCH_KMALLOC_MINALIGN ends up being 4 on x86_32 (it doesn't define ARCH_DMA_MINALIGN and doesn't seem to otherwise override the thing).
So unconditionally setting the alignment of devres::data to 8 seems broken.
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