linux-kernel - Re: scripts/mod/file2alias.c cross compile problem

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Date:	Thu, 2 Aug 2007 21:24:56 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Adrian Bunk <bunk@...sta.de>
Cc:	"Luck, Tony" <tony.luck@...el.com>,
	Andreas Schwab <schwab@...e.de>, trenn@...e.de,
	Jan Dittmer <jdi@....org>, Len Brown <lenb@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-ia64@...r.kernel.org, rusty@...tcorp.com.au,
	jcm@...masters.org
Subject: Re: scripts/mod/file2alias.c cross compile problem

On Thu, Aug 02, 2007 at 09:15:09PM +0200, Adrian Bunk wrote:
> On Thu, Aug 02, 2007 at 08:09:03PM +0200, Sam Ravnborg wrote:
> > 
> > I second this. For anything visible in userspace from
> > include/* we require usage of the kernel specific
> > __u8, __u16, __u32, __u64 typedefs but for device_id we accept
> > kernel_ulong_t which result in the following crap in
> > file2alias.c:
> > 
> > /* We use the ELF typedefs for kernel_ulong_t but bite the bullet and
> >  * use either stdint.h or inttypes.h for the rest. */
> > #if KERNEL_ELFCLASS == ELFCLASS32
> > typedef Elf32_Addr      kernel_ulong_t;
> > #define BITS_PER_LONG 32
> > #else
> > typedef Elf64_Addr      kernel_ulong_t;
> > #define BITS_PER_LONG 64
> > #endif
> > 
> > And we ought to have __u64 available.
> > See for example types.h from asm-i386:
> > #if defined(__GNUC__) && !defined(__STRICT_ANSI__)
> > typedef __signed__ long long __s64;
> > typedef unsigned long long __u64;
> > #endif
> 
> 
> You are talking about something different than the current problem.
> 
> The current problem is that when crosscompiling we get a different 
> _padding_ due to file2alias.c being compiled with HOSTCC.

I am well aware of that.
My point was that we are dealing with userspace - in this case depmod.
So I wondered why we had special (as in less strict) rules here.

	Sam
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