linux-kernel - Re: [PATCH] x86/mm: vmemmap and vmalloc base addressess are usngined longs

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Message-ID: <20180416094603.fj3wevho5j7wy7s6@black.fi.intel.com>
Date:   Mon, 16 Apr 2018 12:46:03 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Jiri Kosina <jikos@...nel.org>
Cc:     "Kirill A. Shutemov" <kirill@...temov.name>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        x86@...nel.org
Subject: Re: [PATCH] x86/mm: vmemmap and vmalloc base addressess are usngined
 longs

On Mon, Apr 16, 2018 at 09:43:02AM +0000, Jiri Kosina wrote:
> On Thu, 12 Apr 2018, Kirill A. Shutemov wrote:
> 
> > > Commits 9b46a051e4 ("x86/mm: Initialize vmemmap_base at boot-time") and 
> > > a7412546d8 ("x86/mm: Adjust vmalloc base and size at boot-time") lost the 
> > > type information for __VMALLOC_BASE_L4, __VMALLOC_BASE_L5, 
> > > __VMEMMAP_BASE_L4 and __VMEMMAP_BASE_L5 constants.
> > > 
> > > Let's declare them explicitly unsigned long again.
> > 
> > It is just cosmetics, right? I mean these literals are 'unsigned long'
> > anyway.
> 
> Yeah, I can't imagine this particular case leading to any overflow 
> scenario, as the literal is big enough to be automatically treated as 
> unsigned long by the compiler, but it shuts up sparse which treats this as 
> a generic case (where the missing UL might be a problem), and totally 
> pollutes the build output.
> 
> Either we put the 'UL' there, or teach sparse about figuring out the 
> 'closer bigger fitting type' for hexadecimal literals, which might be more 
> tricky.

I don't have a problem with the patch:

Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>

-- 
 Kirill A. Shutemov