Re: asm-x86/byteorder.h, CONFIG_X86_BSWAP leaks to userland

[Arjan van de Ven]

On Sat, 26 Jul 2008 12:48:31 -0400
"H. Peter Anvin" <hpa@xxxxxxxxx> w
> > I'm not sure if it's time yet to make the bswap ones be exported,
> > as they would no longer be usable for those early machines.  X86
> > guys CC:d.
> 
> On i386 we still default to i386-compatible binaries; I *think* gcc
> has macros telling you if the user has used -march=i486 etc.

It is also not the kernels job to provide this sort of functionality to
userspace programs. At all. This is gcc/glibc/etc's job.

Rule of thumb: the kernel does not provide code for compiling inside
userspace programs.

(As opposed to providing datastructures that userspace programs can use
to talk to the kernel).



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