free entry in gdt_table

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Hello

I have a doubt, in kernels like 2.4.18 the second entry in gdt is not used

ENTRY(gdt_table)
        .quad 0x0000000000000000 /* NULL descriptor */
        .quad 0x0000000000000000 /* not used */
        .quad 0x00cf9a000000ffff /* 0x10 kernel 4GB code at 0x00000000 */

there are 4 bytes lost!

Why?
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• Next message: Andrew Morton: "2.4.20 low-latency patch"
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