Re: [PATCH] Introduce compat_u64 and compat_s64 types
From: David Miller
Date: Fri Jun 15 2007 - 05:55:30 EST
From: Arnd Bergmann <arnd@xxxxxxxx>
Date: Fri, 15 Jun 2007 11:31:37 +0200
> One common problem with 32 bit system call and ioctl emulation
> is the different alignment rules between i386 and 64 bit machines.
> A number of drivers work around this by marking the compat
> structures as 'attribute((packed))', which is not the right
> solution because it breaks all the non-x86 architectures that
> want to use the same compat code.
> Hopefully, this patch improves the situation, it introduces two
> new types, compat_u64 and compat_s64. These are defined on all
> architectures to have the same size and alignment as the 32 bit
> version of u64 and s64.
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Acked-by: David S. Miller <davem@xxxxxxxxxxxxx>
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