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Commit 4a6d8cf9 authored by Christophe Leroy's avatar Christophe Leroy Committed by Michael Ellerman
Browse files

powerpc/mm: don't use pte_alloc_kernel() until slab is available on PPC32 



In the same way as PPC64, implement early allocation functions and
avoid calling pte_alloc_kernel() before slab is available.

Reviewed-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: default avatarChristophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 627f06c6

arch/powerpc/mm/pgtable_32.c

+28 −6
Original line number Diff line number Diff line
@@ -43,11 +43,8 @@ EXPORT_SYMBOL(ioremap_bot); /* aka VMALLOC_END */ 


extern char etext[], _stext[], _sinittext[], _einittext[];



__ref pte_t *pte_alloc_one_kernel(struct mm_struct *mm)

pte_t *pte_alloc_one_kernel(struct mm_struct *mm)

{

	if (!slab_is_available())

		return memblock_alloc(PTE_FRAG_SIZE, PTE_FRAG_SIZE);



	return (pte_t *)pte_fragment_alloc(mm, 1);

}
@@ -205,7 +202,29 @@ void iounmap(volatile void __iomem *addr) 
}

EXPORT_SYMBOL(iounmap);



int map_kernel_page(unsigned long va, phys_addr_t pa, pgprot_t prot)

static void __init *early_alloc_pgtable(unsigned long size)

{

	void *ptr = memblock_alloc(size, size);



	if (!ptr)

		panic("%s: Failed to allocate %lu bytes align=0x%lx\n",

		      __func__, size, size);



	return ptr;

}



static pte_t __init *early_pte_alloc_kernel(pmd_t *pmdp, unsigned long va)

{

	if (pmd_none(*pmdp)) {

		pte_t *ptep = early_alloc_pgtable(PTE_FRAG_SIZE);



		pmd_populate_kernel(&init_mm, pmdp, ptep);

	}

	return pte_offset_kernel(pmdp, va);

}





int __ref map_kernel_page(unsigned long va, phys_addr_t pa, pgprot_t prot)

{

	pmd_t *pd;

	pte_t *pg;
@@ -214,7 +233,10 @@ int map_kernel_page(unsigned long va, phys_addr_t pa, pgprot_t prot) 
	/* Use upper 10 bits of VA to index the first level map */

	pd = pmd_offset(pud_offset(pgd_offset_k(va), va), va);

	/* Use middle 10 bits of VA to index the second-level map */

	if (likely(slab_is_available()))

		pg = pte_alloc_kernel(pd, va);

	else

		pg = early_pte_alloc_kernel(pd, va);

	if (pg != 0) {

		err = 0;

		/* The PTE should never be already set nor present in the