linux-kernel - Re: [PATCH v11 44/60] PCI: Add alt_size ressource allocation support

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Message-ID: <1460096669.31740.19.camel@kernel.crashing.org>
Date:	Fri, 08 Apr 2016 16:24:29 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Yinghai Lu <yinghai@...nel.org>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	David Miller <davem@...emloft.net>,
	Wei Yang <weiyang@...ux.vnet.ibm.com>, TJ <linux@....tj>,
	Yijing Wang <wangyijing@...wei.com>,
	Khalid Aziz <khalid.aziz@...cle.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v11 44/60] PCI: Add alt_size ressource allocation support

On Thu, 2016-04-07 at 17:56 -0700, Linus Torvalds wrote:
> Maybe the kernel should just accept the smaller alignment. If the
> minimum alignment we use is bigger than necessary, then we're just
> wrong about it, and perhaps we should just use the smaller alignment
> that the bios used.
> 
> So instead of adding this notion of alternate alignment, maybe we
> should just not be so uptight about our own minimum alignment
> requirements?

On the other hand it's nice to align things at page boundaries when
these resources can possibly be mapped by user space or KVM guests...

Cheers,
Ben.