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SubjectRe: [PATCH] block: fix q->max_segment_size checking in blk_recalc_rq_segments about VMERGE
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From: James Bottomley <James.Bottomley@HansenPartnership.com>
Date: Thu, 24 Jul 2008 23:47:50 -0400

> I'm sorry sparc broke, really I am ... but you changed your iommu code
> from one with a working vmerge to one without and failed to turn off
> vmerging. Partly it wasn't noticed because at 2*PAGE_SIZE you have a
> strange vmerge boundary, so it's harder to notice. However, I can't
> extrapolate that just because this happened on sparc it will inevitably
> happen on all other architectures.

The vmerge boundary on sparc64 was 8K which is equal to sparc64's base
PAGE_SIZE. I don't know where you get that 2*PAGE_SIZE from.



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