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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: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy 2019-04-26 15:58:06 +00:00 committed by Michael Ellerman
parent 627f06c6f5
commit 4a6d8cf900
1 changed files with 28 additions and 6 deletions
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34
arch/powerpc/mm/pgtable_32.c
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@ -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 */
pg = pte_alloc_kernel(pd, va);
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