linux-kernel - Re: [PATCH v2] mm/hotplug: Verify hotplug memory range

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Date:	Wed, 14 Aug 2013 16:45:08 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Toshi Kani <toshi.kani@...com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	kosaki.motohiro@...fujitsu.com, kamezawa.hiroyu@...fujitsu.com,
	dave@...1.net, isimatu.yasuaki@...fujitsu.com,
	tangchen@...fujitsu.com, vasilis.liaskovitis@...fitbricks.com
Subject: Re: [PATCH v2] mm/hotplug: Verify hotplug memory range

On Wed, 14 Aug 2013 17:34:02 -0600 Toshi Kani <toshi.kani@...com> wrote:

> > Printing a u64 is problematic.  Here you assume that u64 is implemented
> > as unsigned long long.  But it can be implemented as unsigned long, by
> > architectures which use include/asm-generic/int-l64.h.  Such an
> > architecture will generate a compile warning here, but I can't
> > immediately find a Kconfig combination which will make that happen.
> 
> Oh, I see.  Should I add the casting below and resend it to you?
> 
>                 (unsigned long long)start, (unsigned long long)size);

I was going to leave it as-is and see if anyone else can find a way of
triggering the warning.  But other sites in mm/memory_hotplug.c have
the casts so I went ahead and fixed it.

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