Re: [PATCH] x86: do not expose CONFIG_BSWAP to userspace

[Linus Torvalds]

On Wed, 28 Jan 2009, Harvey Harrison wrote:
>
> Use ifdef __i486__ to ensure the BSWAP instruction is available
> on 32-bit x86.
> 
> Signed-off-by: Harvey Harrison <harvey.harrison@xxxxxxxxx>
> ---
> HPA,
> 
> I'm afraid my knowledge of gcc compiler flags for various models is
> lacking, I used i486 as suggested, just wanted to make sure I understood
> you corectly.

I really don't think this works.

Try this:

	cpp -dM -m32 -march=pentium t.c | grep i486

and see the marked absense of __i486__ anywhere.

At least CONFIG_X86_BSWAP gives the right behaviour for the kernel.

			Linus
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