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powerpc/mm: Add missing pmd accessors

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This patch add documentation and missing accessors.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Aneesh Kumar K.V
2014-11-05 21:57:39 +05:30
committed by Michael Ellerman
parent 9e819963b4
commit 06743521d0
5 changed files with 78 additions and 17 deletions
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3
arch/powerpc/mm/hugetlbpage.c
View File

@@ -62,6 +62,9 @@ static unsigned nr_gpages;
/*
* We have PGD_INDEX_SIZ = 12 and PTE_INDEX_SIZE = 8, so that we can have
* 16GB hugepage pte in PGD and 16MB hugepage pte at PMD;
*
* Defined in such a way that we can optimize away code block at build time
* if CONFIG_HUGETLB_PAGE=n.
*/
int pmd_huge(pmd_t pmd)
{

22
arch/powerpc/mm/pgtable_64.c
View File

@@ -35,6 +35,7 @@
#include <linux/vmalloc.h>
#include <linux/memblock.h>
#include <linux/slab.h>
#include <linux/hugetlb.h>
#include <asm/pgalloc.h>
#include <asm/page.h>
@@ -344,16 +345,31 @@ EXPORT_SYMBOL(iounmap);
EXPORT_SYMBOL(__iounmap);
EXPORT_SYMBOL(__iounmap_at);
#ifndef __PAGETABLE_PUD_FOLDED
/* 4 level page table */
struct page *pgd_page(pgd_t pgd)
{
if (pgd_huge(pgd))
return pte_page(pgd_pte(pgd));
return virt_to_page(pgd_page_vaddr(pgd));
}
#endif
struct page *pud_page(pud_t pud)
{
if (pud_huge(pud))
return pte_page(pud_pte(pud));
return virt_to_page(pud_page_vaddr(pud));
}
/*
* For hugepage we have pfn in the pmd, we use PTE_RPN_SHIFT bits for flags
* For PTE page, we have a PTE_FRAG_SIZE (4K) aligned virtual address.
*/
struct page *pmd_page(pmd_t pmd)
{
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
if (pmd_trans_huge(pmd))
if (pmd_trans_huge(pmd) || pmd_huge(pmd))
return pfn_to_page(pmd_pfn(pmd));
#endif
return virt_to_page(pmd_page_vaddr(pmd));
}