linux-kernel - Re: [PATCH] arch: x86: boot: compressed: eboot: fix cast warnings on 32b platforms

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Date:	Tue, 01 Jan 2013 09:34:16 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Borislav Petkov <bp@...en8.de>,
	Stefan Hasko <hasko.stevo@...il.com>,
	Matt Fleming <matt.fleming@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arch: x86: boot: compressed: eboot: fix cast warnings
 on 32b platforms

On 12/26/2012 12:00 AM, Borislav Petkov wrote:
> On Sat, Dec 22, 2012 at 11:23:25AM +0100, Stefan Hasko wrote:
>> Fixed different size cast warnings in function setup_efi_pci
>>
>> Signed-off-by: Stefan Hasko <hasko.stevo@...il.com>
> 
> You might want to add the actual compiler warnings to the commit
> message:
> 
> arch/x86/boot/compressed/eboot.c: In function ‘setup_efi_pci’:
> arch/x86/boot/compressed/eboot.c:259:9: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
> arch/x86/boot/compressed/eboot.c:262:10: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
> arch/x86/boot/compressed/eboot.c:348:17: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
> arch/x86/boot/compressed/eboot.c:350:29: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
> 
> And yes, I see them in all{mod,yes}config builds here too. The issue,
> AFAICT, is that setup_data is __u64 to obviously accomodate 8-byte
> pointers on x86-64 but on 32-bit they're half the size. And we obviously
> cannot change struct setup_data since this is an ABI so I'd guess the
> casts to native pointer sizes are ok. So
> 
> Acked-by: Borislav Petkov <bp@...en8.de>
> 

Yes, but stylistically: we don't use uintptr_t in Linux, but rather
"unsigned long".

	-hpa


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