Re: [PATCH] scatterlist: enable sg chaining for all architectures

From: Andrew Morton
Date: Tue Apr 28 2015 - 17:27:49 EST

On Sat, 25 Apr 2015 23:56:16 +0900 Akinobu Mita <akinobu.mita@xxxxxxxxx> wrote:

> Some architectures enable sg chaining option while others do not.
> The requirement to enable sg chaining is that pages must be aligned
> at a 32-bit boundary in order to overload the LSB of the pointer.
> Regardless of whether ARCH_HAS_SG_CHAIN is defined or not, the above
> requirement is always chacked by BUG_ON() in sg_assign_page. So
> all architectures can enable sg chaining.
> As you can see from the changes in drivers/target/target_core_rd.c,
> enabling SG chaining for all architectures allows us to allocate
> discontiguous scatterlist tables which can be traversed throughout
> by sg_next() without a special handling for some architectures.

Thanks, I'll grab this. If anyone has concerns, speak now or hold both

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