Unverified Commit a0a31fd8 authored by Zong Li's avatar Zong Li Committed by Palmer Dabbelt
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riscv: allocate a complete page size for each page table 



Each page table should be created by allocating a complete page size
for it. Otherwise, the content of the page table would be corrupted
somewhere through memory allocation which allocates the memory at the
middle of the page table for other use.

Signed-off-by: default avatarZong Li <zong.li@sifive.com>
Signed-off-by: default avatarPalmer Dabbelt <palmerdabbelt@google.com>
parent e7167043

arch/riscv/mm/kasan_init.c

+16 −11
Original line number Diff line number Diff line
@@ -46,29 +46,34 @@ asmlinkage void __init kasan_early_init(void) 


static void __init populate(void *start, void *end)

{

	unsigned long i;

	unsigned long i, offset;

	unsigned long vaddr = (unsigned long)start & PAGE_MASK;

	unsigned long vend = PAGE_ALIGN((unsigned long)end);

	unsigned long n_pages = (vend - vaddr) / PAGE_SIZE;

	unsigned long n_ptes =

	    ((n_pages + PTRS_PER_PTE) & -PTRS_PER_PTE) / PTRS_PER_PTE;

	unsigned long n_pmds =

		(n_pages % PTRS_PER_PTE) ? n_pages / PTRS_PER_PTE + 1 :

						n_pages / PTRS_PER_PTE;

	    ((n_ptes + PTRS_PER_PMD) & -PTRS_PER_PMD) / PTRS_PER_PMD;



	pte_t *pte =

	    memblock_alloc(n_ptes * PTRS_PER_PTE * sizeof(pte_t), PAGE_SIZE);

	pmd_t *pmd =

	    memblock_alloc(n_pmds * PTRS_PER_PMD * sizeof(pmd_t), PAGE_SIZE);

	pgd_t *pgd = pgd_offset_k(vaddr);

	pmd_t *pmd = memblock_alloc(n_pmds * sizeof(pmd_t), PAGE_SIZE);

	pte_t *pte = memblock_alloc(n_pages * sizeof(pte_t), PAGE_SIZE);



	for (i = 0; i < n_pages; i++) {

		phys_addr_t phys = memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);



		set_pte(pte + i, pfn_pte(PHYS_PFN(phys), PAGE_KERNEL));

		set_pte(&pte[i], pfn_pte(PHYS_PFN(phys), PAGE_KERNEL));

	}



	for (i = 0; i < n_pmds; ++pgd, i += PTRS_PER_PMD)

		set_pgd(pgd, pfn_pgd(PFN_DOWN(__pa(((uintptr_t)(pmd + i)))),

	for (i = 0, offset = 0; i < n_ptes; i++, offset += PTRS_PER_PTE)

		set_pmd(&pmd[i],

			pfn_pmd(PFN_DOWN(__pa(&pte[offset])),

				__pgprot(_PAGE_TABLE)));



	for (i = 0; i < n_pages; ++pmd, i += PTRS_PER_PTE)

		set_pmd(pmd, pfn_pmd(PFN_DOWN(__pa((uintptr_t)(pte + i))),

	for (i = 0, offset = 0; i < n_pmds; i++, offset += PTRS_PER_PMD)

		set_pgd(&pgd[i],

			pfn_pgd(PFN_DOWN(__pa(&pmd[offset])),

				__pgprot(_PAGE_TABLE)));



	flush_tlb_all();

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