Re: [STUPID] Best looking code to transfer to a t-shirt

[Alvaro Lopes <alvieboy@alvie.com>]

Maciej Soltysiak wrote:

>Hi,
>
>I am in a t-shirt transfering frenzy and was wondering which part of the
>kernel code it would be best to have on my t-shirt.
>I was looking at my favourite: netfilter code, but it is to clean, short
>and simple functions, no tons of pointers, no mallocs, no hex numbers, too
>many defines used. I was looking for something terribly complicated and
>looking awesome to the eye.
>  
>
arch/i386/mm/fault.c

        /*
         * Synchronize this task's top level page-table
         * with the 'reference' page table.
         *
         * Do _not_ use "tsk" here. We might be inside
         * an interrupt in the middle of a task switch..
         */
        int offset = __pgd_offset(address);
        pgd_t *pgd, *pgd_k;
        pmd_t *pmd, *pmd_k;
        pte_t *pte_k;

        asm("movl %%cr3,%0":"=r" (pgd));
        pgd = offset + (pgd_t *)__va(pgd);
        pgd_k = init_mm.pgd + offset;

        if (!pgd_present(*pgd_k))
            goto no_context;
        set_pgd(pgd, *pgd_k);
       
        pmd = pmd_offset(pgd, address);
        pmd_k = pmd_offset(pgd_k, address);
        if (!pmd_present(*pmd_k))
            goto no_context;
        set_pmd(pmd, *pmd_k);

        pte_k = pte_offset_kernel(pmd_k, address);
        if (!pte_present(*pte_k))
            goto no_context;
        return;
    }

-- 

Álvaro Lopes 
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