linux-kernel - Re: [PATCH 12/16] Fix types in EFI calls to match EFI function definitions.

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Message-ID: <CAFECyb8Jz7BatDUzdaiPvAvJg11-zWwAv5ZN1soMcXCvGPPHCw@mail.gmail.com>
Date:	Fri, 30 Aug 2013 16:16:53 -0700
From:	Roy Franz <roy.franz@...aro.org>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	matt.fleming@...el.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-efi@...r.kernel.org,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Leif Lindholm <leif.lindholm@...aro.org>,
	Dave Martin <dave.martin@....com>,
	Mark Salter <msalter@...hat.com>
Subject: Re: [PATCH 12/16] Fix types in EFI calls to match EFI function definitions.

On Fri, Aug 30, 2013 at 4:14 PM, Grant Likely <grant.likely@...retlab.ca> wrote:
> On Sat, Aug 31, 2013 at 12:12 AM, Roy Franz <roy.franz@...aro.org> wrote:
>> On Fri, Aug 30, 2013 at 6:39 AM, Grant Likely <grant.likely@...retlab.ca> wrote:
>>> I think you need some description in the commit text about why the type
>>> of chunksize is changing. It's not clear why you're making this change.
>>> It is a bug fix?
>>
>> The type was changed to match the EFI_FILE_PROTOCOL specification -
>> chunk size is
>> defined as a native width unsigned integer.  So yes, this is a bug in
>> that this is wrong for
>> ia32, since that really should be a u32 in that case.
>> Since the x86 wrappers break type checking by the compiler these types
>> were never checked at compile time
>> before.  chunksize is the the only change that isn't a cast to a type
>> of void pointer.
>>
>> I can break this change out as a separate patch if desired.
>
> I don't think it needs to be in a separate patch, but it does need to
> be described in the patch description.
>
> g.

Did that - how about:

Fix types in EFI calls to match EFI function definitions.

EFI calls can made directly on ARM, so the function pointers
are directly invoked.  This allows types to be checked at
compile time, so here we ensure that the parameters match
the function signature. The wrappers used by x86 prevent
any type checking.
Correct the type of chunksize to be based on native
width as specified by the EFI_FILE_PROTOCOL read()
function.

Signed-off-by: Roy Franz <roy.franz@...aro.org>
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