From: Linus Torvalds <[EMAIL PROTECTED]> Date: Wed, 17 Oct 2007 18:36:34 -0700 (PDT)
> Although I also wonder whether we want one global per-arch > ARCH_HAS_SG_CHAIN It's there because the DMA mapping support code for a platform has to be converted to handle these chains and audited to make sure the conversion is right. Some platforms, such as sparc64, took a lot of work to get right :-) Once that macro is set, the block device driver has to support it too, and there are knobs all the way down to the scsi host driver to indicate this. The idea is that all of this mess gets deleted in the end, it was meant to be a safe transition scheme. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/