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arm64: mm: Consolidate early page table allocation 

The logic for early allocation of page tables is duplicated between
pgd_kernel_pgtable_alloc() and pgd_pgtable_alloc(). Drop the duplication
by calling one from the other and renaming pgd_kernel_pgtable_alloc()
accordingly.

Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon 2019-04-08 11:23:48 +01:00
parent 54c8d9119e
commit 475ba3fc19
1 changed files with 7 additions and 11 deletions
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18
arch/arm64/mm/mmu.c
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@ -371,7 +371,7 @@ static void __create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys,
} while (pgdp++, addr = next, addr != end);
}
static phys_addr_t pgd_kernel_pgtable_alloc(int shift)
static phys_addr_t __pgd_pgtable_alloc(int shift)
{
void *ptr = (void *)__get_free_page(PGALLOC_GFP);
BUG_ON(!ptr);
@ -383,8 +383,7 @@ static phys_addr_t pgd_kernel_pgtable_alloc(int shift)
static phys_addr_t pgd_pgtable_alloc(int shift)
{
void *ptr = (void *)__get_free_page(PGALLOC_GFP);
BUG_ON(!ptr);
phys_addr_t pa = __pgd_pgtable_alloc(shift);
/*
* Call proper page table ctor in case later we need to
@ -395,13 +394,11 @@ static phys_addr_t pgd_pgtable_alloc(int shift)
* folded, and if so pgtable_pmd_page_ctor() becomes nop.
*/
if (shift == PAGE_SHIFT)
BUG_ON(!pgtable_page_ctor(virt_to_page(ptr)));
BUG_ON(!pgtable_page_ctor(phys_to_page(pa)));
else if (shift == PMD_SHIFT)
BUG_ON(!pgtable_pmd_page_ctor(virt_to_page(ptr)));
BUG_ON(!pgtable_pmd_page_ctor(phys_to_page(pa)));
/* Ensure the zeroed page is visible to the page table walker */
dsb(ishst);
return __pa(ptr);
return pa;
}
/*
@ -605,7 +602,7 @@ static int __init map_entry_trampoline(void)
/* Map only the text into the trampoline page table */
memset(tramp_pg_dir, 0, PGD_SIZE);
__create_pgd_mapping(tramp_pg_dir, pa_start, TRAMP_VALIAS, PAGE_SIZE,
prot, pgd_kernel_pgtable_alloc, 0);
prot, __pgd_pgtable_alloc, 0);
/* Map both the text and data into the kernel page table */
__set_fixmap(FIX_ENTRY_TRAMP_TEXT, pa_start, prot);
@ -1077,8 +1074,7 @@ int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
flags = NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS;
__create_pgd_mapping(swapper_pg_dir, start, __phys_to_virt(start),
size, PAGE_KERNEL, pgd_kernel_pgtable_alloc,
flags);
size, PAGE_KERNEL, __pgd_pgtable_alloc, flags);
return __add_pages(nid, start >> PAGE_SHIFT, size >> PAGE_SHIFT,
altmap, want_memblock);