[Xen-devel] question (bug?) in xeno-linux code

["Runting Shi" <rshi@xxxxxxx>]

Hey, in xeno-linux, arch/i386/mm/pgtable-xen.c (line 363),

why are we doing set_pgd(&pgd[USER_PTRS_PER_PGD], __pgd(1 + __pa(pmd)));

shouldn't it be set_pgd(&pgd[USER_PTRS_PER_PGD + i], __pgd(1 + __pa(pmd))) 
or something?

I am just wondering why the for loop is there at all....


Thanks,

Elaine


for (i = USER_PTRS_PER_PGD; i < PTRS_PER_PGD; i++) {
                        pmd_t *pmd = kmem_cache_alloc(pmd_cache, GFP_KERNEL);
                        if (!pmd)
                                goto out_oom;
                        set_pgd(&pgd[USER_PTRS_PER_PGD], __pgd(1 + __pa(pmd)));
                }


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