linux-kernel - Re: [tip:x86/x32] x32: Fix alignment fail in struct compat

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Message-ID: <CAMe9rOrjyh13MXCVgPLtZemjrkSC3uoMhB4_WCsXVjv7T2nMJg@mail.gmail.com>
Date:	Wed, 18 Apr 2012 17:14:42 -0700
From:	"H.J. Lu" <hjl.tools@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	mingo@...hat.com, linux-kernel@...r.kernel.org, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/x32] x32: Fix alignment fail in struct compat_siginfo

On Wed, Apr 18, 2012 at 5:09 PM, H. Peter Anvin <hpa@...or.com> wrote:
> On 04/18/2012 04:54 PM, H.J. Lu wrote:
>>>
>>> We could.  If we want to align the substructures then we need some major
>>> surgery to the compat_siginfo handling though.
>>>
>>
>> Since there will be no x32 kernel, align struct siginfo to 8byte for x32
>> will only be for user space code.  It shouldn't be a problem for kernel.
>>
>
> Well, for aligning the whole structure I don't think there is any change
> to the kernel at all...
>

That is true.  This is only by user codes to pass 8bye aligned
struct siginfo pointer to kernel.

-- 
H.J.
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