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And there is confusion between pgd and p4d in function fixmap_pte, such as pgd_none always returns zero. This patch adds unified function populate_kernel_pte and replaces pcpu_populate_pte and fixmap_pte. Signed-off-by: Bibo Mao --- arch/loongarch/include/asm/pgalloc.h | 1 + arch/loongarch/kernel/numa.c | 40 +-------------------- arch/loongarch/mm/init.c | 52 ++++++++++++++++------------ 3 files changed, 32 insertions(+), 61 deletions(-) diff --git a/arch/loongarch/include/asm/pgalloc.h b/arch/loongarch/include/asm/pgalloc.h index af1d1e4a6965..ca17b573dba6 100644 --- a/arch/loongarch/include/asm/pgalloc.h +++ b/arch/loongarch/include/asm/pgalloc.h @@ -91,4 +91,5 @@ static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address) #endif /* __PAGETABLE_PUD_FOLDED */ +extern pte_t * __init populate_kernel_pte(unsigned long addr); #endif /* _ASM_PGALLOC_H */ diff --git a/arch/loongarch/kernel/numa.c b/arch/loongarch/kernel/numa.c index 778e1c20bfb0..24a693b76873 100644 --- a/arch/loongarch/kernel/numa.c +++ b/arch/loongarch/kernel/numa.c @@ -67,46 +67,8 @@ static int __init pcpu_cpu_distance(unsigned int from, unsigned int to) void __init pcpu_populate_pte(unsigned long addr) { - pgd_t *pgd = pgd_offset_k(addr); - p4d_t *p4d = p4d_offset(pgd, addr); - pud_t *pud; - pmd_t *pmd; - - if (p4d_none(*p4d)) { - pud = memblock_alloc_raw(PAGE_SIZE, PAGE_SIZE); - if (!pud) - goto err_alloc; - p4d_populate(&init_mm, p4d, pud); -#ifndef __PAGETABLE_PUD_FOLDED - pud_init(pud); -#endif - } - - pud = pud_offset(p4d, addr); - if (pud_none(*pud)) { - pmd = memblock_alloc_raw(PAGE_SIZE, PAGE_SIZE); - if (!pmd) - goto err_alloc; - pud_populate(&init_mm, pud, pmd); -#ifndef __PAGETABLE_PMD_FOLDED - pmd_init(pmd); -#endif - } - - pmd = pmd_offset(pud, addr); - if (!pmd_present(*pmd)) { - pte_t *pte; - - pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE); - if (!pte) - goto err_alloc; - pmd_populate_kernel(&init_mm, pmd, pte); - } - + populate_kernel_pte(addr); return; - -err_alloc: - panic("%s: Failed to allocate memory\n", __func__); } void __init setup_per_cpu_areas(void) diff --git a/arch/loongarch/mm/init.c b/arch/loongarch/mm/init.c index 3b7d8129570b..6cd2948373ae 100644 --- a/arch/loongarch/mm/init.c +++ b/arch/loongarch/mm/init.c @@ -191,46 +191,49 @@ void vmemmap_free(unsigned long start, unsigned long end, struct vmem_altmap *al #endif #endif -static pte_t *fixmap_pte(unsigned long addr) +pte_t * __init populate_kernel_pte(unsigned long addr) { - pgd_t *pgd; - p4d_t *p4d; + pgd_t *pgd = pgd_offset_k(addr); + p4d_t *p4d = p4d_offset(pgd, addr); pud_t *pud; pmd_t *pmd; - pgd = pgd_offset_k(addr); - p4d = p4d_offset(pgd, addr); - - if (pgd_none(*pgd)) { - pud_t *new __maybe_unused; - - new = memblock_alloc_low(PAGE_SIZE, PAGE_SIZE); - pgd_populate(&init_mm, pgd, new); + if (p4d_none(*p4d)) { + pud = memblock_alloc_raw(PAGE_SIZE, PAGE_SIZE); + if (!pud) + goto err_alloc; + 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 __maybe_unused; - - new = memblock_alloc_low(PAGE_SIZE, PAGE_SIZE); - pud_populate(&init_mm, pud, new); + pmd = memblock_alloc_raw(PAGE_SIZE, PAGE_SIZE); + if (!pmd) + goto err_alloc; + pud_populate(&init_mm, pud, pmd); #ifndef __PAGETABLE_PMD_FOLDED - pmd_init(new); + pmd_init(pmd); #endif } pmd = pmd_offset(pud, addr); - if (pmd_none(*pmd)) { - pte_t *new __maybe_unused; + if (!pmd_present(*pmd)) { + pte_t *pte; - new = memblock_alloc_low(PAGE_SIZE, PAGE_SIZE); - pmd_populate_kernel(&init_mm, pmd, new); + pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE); + if (!pte) + goto err_alloc; + pmd_populate_kernel(&init_mm, pmd, pte); } return pte_offset_kernel(pmd, addr); + +err_alloc: + panic("%s: Failed to allocate memory\n", __func__); + return NULL; } void __init __set_fixmap(enum fixed_addresses idx, @@ -241,7 +244,12 @@ void __init __set_fixmap(enum fixed_addresses idx, BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); - ptep = fixmap_pte(addr); + /* + * Now only FIX_EARLYCON_MEM_BASE fixed map is used + * __set_fixmap must be called before mem_init since function + * populate_kernel_pte allocates memory with memblock_alloc method. + */ + ptep = populate_kernel_pte(addr); if (!pte_none(*ptep)) { pte_ERROR(*ptep); return;