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ARM: pgtable: provide get_top_pte() to complement set_top_pte()

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Provide get_top_pte() to complement set_top_pte(), moving the only
users of TOP_PTE to arch/arm/mm/mm.h.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2011-07-04 11:22:27 +01:00
parent 67ece14431
commit 0d31fe47b0
2 changed files with 8 additions and 5 deletions
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8
arch/arm/mm/highmem.c
View File

@ -69,7 +69,7 @@ void *__kmap_atomic(struct page *page)
* With debugging enabled, kunmap_atomic forces that entry to 0. * With debugging enabled, kunmap_atomic forces that entry to 0.
* Make sure it was indeed properly unmapped. * Make sure it was indeed properly unmapped.
*/ */
BUG_ON(!pte_none(*(TOP_PTE(vaddr)))); BUG_ON(!pte_none(get_top_pte(vaddr)));
#endif #endif
/* /*
* When debugging is off, kunmap_atomic leaves the previous mapping * When debugging is off, kunmap_atomic leaves the previous mapping
@ -119,7 +119,7 @@ void *kmap_atomic_pfn(unsigned long pfn)
idx = type + KM_TYPE_NR * smp_processor_id(); idx = type + KM_TYPE_NR * smp_processor_id();
vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
#ifdef CONFIG_DEBUG_HIGHMEM #ifdef CONFIG_DEBUG_HIGHMEM
BUG_ON(!pte_none(*(TOP_PTE(vaddr)))); BUG_ON(!pte_none(get_top_pte(vaddr)));
#endif #endif
set_top_pte(vaddr, pfn_pte(pfn, kmap_prot)); set_top_pte(vaddr, pfn_pte(pfn, kmap_prot));
@ -129,11 +129,9 @@ void *kmap_atomic_pfn(unsigned long pfn)
struct page *kmap_atomic_to_page(const void *ptr) struct page *kmap_atomic_to_page(const void *ptr)
{ {
unsigned long vaddr = (unsigned long)ptr; unsigned long vaddr = (unsigned long)ptr;
pte_t *pte;
if (vaddr < FIXADDR_START) if (vaddr < FIXADDR_START)
return virt_to_page(ptr); return virt_to_page(ptr);
pte = TOP_PTE(vaddr); return pte_page(get_top_pte(vaddr));
return pte_page(*pte);
} }

5
arch/arm/mm/mm.h
View File

@ -24,6 +24,11 @@ static inline void set_top_pte(unsigned long va, pte_t pte)
local_flush_tlb_kernel_page(va); local_flush_tlb_kernel_page(va);
} }
static inline pte_t get_top_pte(unsigned long va)
{
return *TOP_PTE(va);
}
static inline pmd_t *pmd_off_k(unsigned long virt) static inline pmd_t *pmd_off_k(unsigned long virt)
{ {
return pmd_offset(pud_offset(pgd_offset_k(virt), virt), virt); return pmd_offset(pud_offset(pgd_offset_k(virt), virt), virt);