Messages in this thread | | | From | Andi Kleen <> | Subject | Re: [PATCH] Introduce compat_u64 and compat_s64 types | Date | Fri, 15 Jun 2007 13:55:57 +0200 |
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On Friday 15 June 2007 11:31:37 Arnd Bergmann wrote: > 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.
Why does it break them? It should just make them a little slower.
The network code requires unaligned accesses to work anyways so if your architecture doesn't support them it is already remotely crashable.
-Andi
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