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LoongArch: Code improvements in function pcpu_populate_pte()

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Do some code improvements in function pcpu_populate_pte():
1. Add memory allocation failure handling;
2. Replace pgd_populate() with p4d_populate(), it will be useful if
   there are four-level page tables.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Bibo Mao 2023-09-06 22:53:09 +08:00 committed by Huacai Chen
parent ad3ff10561
commit f33efa905c
1 changed files with 15 additions and 13 deletions
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28
arch/loongarch/kernel/numa.c
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@ -73,32 +73,34 @@ void __init pcpu_populate_pte(unsigned long addr)
pmd_t *pmd;
if (p4d_none(*p4d)) {
pud_t *new;
new = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
pgd_populate(&init_mm, pgd, new);
pud = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
if (!pud)
panic("%s: Failed to allocate memory\n", __func__);
p4d_populate(&init_mm, p4d, pud);
#ifndef __PAGETABLE_PUD_FOLDED
pud_init(new);
pud_init(pud);
#endif
}
pud = pud_offset(p4d, addr);
if (pud_none(*pud)) {
pmd_t *new;
new = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
pud_populate(&init_mm, pud, new);
pmd = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
if (!pmd)
panic("%s: Failed to allocate memory\n", __func__);
pud_populate(&init_mm, pud, pmd);
#ifndef __PAGETABLE_PMD_FOLDED
pmd_init(new);
pmd_init(pmd);
#endif
}
pmd = pmd_offset(pud, addr);
if (!pmd_present(*pmd)) {
pte_t *new;
pte_t *pte;
new = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
pmd_populate_kernel(&init_mm, pmd, new);
pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
if (!pte)
panic("%s: Failed to allocate memory\n", __func__);
pmd_populate_kernel(&init_mm, pmd, pte);
}
}