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Linux: Unified x86 Architecture
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Thomas Gleixner described an effort to create a unified x86 architecture tree, "the core idea behind our project is simple to describe: we introduce a new arch/x86/ and include/asm-x86/ file hierarchy that includes all the existing 32-bit and 64-bit x86 code and allows the building of either a 32-bit (i386) kernel or a 64-bit (x86_64) kernel." Andi Kleen expressed some concern, "I think it's a bad idea because it means we can never get rid of any old junk. IMNSHO arch/x86_64 is significantly cleaner and simpler in many ways than arch/i386 and I would like to preserve that. Also in general arch/x86_64 is much easier to hack than arch/i386 because it's easier to regression test and in general has to care about much less junk. And I don't know of any way to ever fix that for i386 besides splitting the old stuff off completely."
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