[klibc] Re: sys_mmap2 on different architectures

David S. Miller davem at davemloft.net
Wed Feb 22 16:43:47 PST 2006

From: Benjamin LaHaise <bcrl at kvack.org>
Date: Wed, 22 Feb 2006 19:14:11 -0500

> The sys_mmap2() ABI is that the page shift is always fixed to whatever 
> page size is reasonable for the architecture, typically 2^12.  The syscall 
> should never be exposed as mmap2(), only as the large file size version 
> of mmap() (aka mmap64()).  The other consideration is that it should not 
> be implemented in 64 bit ABIs, as those machines should be using a 64 bit 
> native mmap().  Does that clear things up a bit?  Cheers,

Aha, that part I didn't catch.  Thanks for the clarification

I wonder why we did things that way with a fixed shift...

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