linux-kernel - Re: [PATCH v5 01/14] x86/mm: sparse warning fix for early

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Date:	Tue, 10 Dec 2013 10:12:21 +0800
From:	Dave Young <dyoung@...hat.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
	x86@...nel.org, mjg59@...f.ucam.org,
	James.Bottomley@...senPartnership.com, vgoyal@...hat.com,
	ebiederm@...ssion.com, horms@...ge.net.au,
	kexec@...ts.infradead.org, greg@...ah.com, matt@...sole-pimps.org,
	toshi.kani@...com
Subject: Re: [PATCH v5 01/14] x86/mm: sparse warning fix for early_memremap

On 12/09/13 at 04:05pm, Borislav Petkov wrote:
> On Mon, Dec 09, 2013 at 05:42:14PM +0800, Dave Young wrote:
> > There's a lot of sparse warnings for code like below:
> > void *a = early_memremap(phys_addr, size);
> > 
> > early_memremap intend to map kernel memory with ioremap facility, the return
> > pointer should be a kernel ram pointer instead of iomem one.
> > 
> > For making the function clearer and supressing sparse warnings this patch
> > do below two things:
> > 1. cast to (__force void *) for the return value of early_memremap
> 
> I'd guess this is to shut up the __iomem thing? And we're getting that
> because we're using ioremap, ... hohum...

Yes, IMHO early_memremap really should not return __iomem pointer since it's
*memremap*... 

Thanks
Dave
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