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SubjectRe: [PATCH] Dead code in i386/kernel/process.c
Brian Gerst wrote:
> This patch removes an artifact of code left over from the 2.0 days when
> the kernel didn't use flat segments.
>
>
> ------------------------------------------------------------------------
>
> diff -urN linux-2.5.30/arch/i386/kernel/process.c linux/arch/i386/kernel/process.c
> --- linux-2.5.30/arch/i386/kernel/process.c Fri Aug 2 10:15:28 2002
> +++ linux/arch/i386/kernel/process.c Sat Aug 3 16:41:03 2002
> @@ -313,11 +313,6 @@
> memcpy (swapper_pg_dir, swapper_pg_dir + USER_PGD_PTRS,
> sizeof (swapper_pg_dir [0]) * KERNEL_PGD_PTRS);
>
> - /* Make sure the first page is mapped to the start of physical memory.
> - It is normally not mapped, to trap kernel NULL pointer dereferences. */
> -
> - pg0[0] = _PAGE_RW | _PAGE_PRESENT;
> -
> /*
> * Use `swapper_pg_dir' as our page directory.
> */

I should clarify that the dead code does the same thing as the preceding
memcpy.

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