Commit e8a75963 authored by Vineet Gupta's avatar Vineet Gupta
Browse files

ARC: mm: switch pgtable_to to pte_t * 



ARC is the only arch with unsigned long type (vs. struct page *).
Historically this was done to avoid the page_address() calls in various
arch hooks which need to get the virtual/logical address of the table.

Some arches alternately define it as pte_t *, and is as efficient as
unsigned long (generated code doesn't change)

Suggested-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
parent 049e6dde

arch/arc/include/asm/page.h

+2 −2
Original line number Diff line number Diff line
@@ -43,7 +43,6 @@ typedef struct { 
typedef struct {

	unsigned long pgprot;

} pgprot_t;

typedef unsigned long pgtable_t;



#define pte_val(x)      ((x).pte)

#define pgd_val(x)      ((x).pgd)
@@ -60,7 +59,6 @@ typedef unsigned long pgtable_t; 
typedef unsigned long pte_t;

typedef unsigned long pgd_t;

typedef unsigned long pgprot_t;

typedef unsigned long pgtable_t;



#define pte_val(x)	(x)

#define pgd_val(x)	(x)
@@ -71,6 +69,8 @@ typedef unsigned long pgtable_t; 


#endif



typedef pte_t * pgtable_t;



#define ARCH_PFN_OFFSET     (CONFIG_LINUX_LINK_BASE >> PAGE_SHIFT)



#define pfn_valid(pfn)      (((pfn) - ARCH_PFN_OFFSET) < max_mapnr)

arch/arc/include/asm/pgalloc.h

+3 −3
Original line number Diff line number Diff line
@@ -107,7 +107,7 @@ pte_alloc_one(struct mm_struct *mm, unsigned long address) 
	pgtable_t pte_pg;

	struct page *page;



	pte_pg = __get_free_pages(GFP_KERNEL | __GFP_REPEAT, __get_order_pte());

	pte_pg = (pgtable_t)__get_free_pages(GFP_KERNEL | __GFP_REPEAT, __get_order_pte());

	if (!pte_pg)

		return 0;

	memzero((void *)pte_pg, PTRS_PER_PTE * 4);
@@ -128,12 +128,12 @@ static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) 
static inline void pte_free(struct mm_struct *mm, pgtable_t ptep)

{

	pgtable_page_dtor(virt_to_page(ptep));

	free_pages(ptep, __get_order_pte());

	free_pages((unsigned long)ptep, __get_order_pte());

}



#define __pte_free_tlb(tlb, pte, addr)  pte_free((tlb)->mm, pte)



#define check_pgt_cache()   do { } while (0)

#define pmd_pgtable(pmd) pmd_page_vaddr(pmd)

#define pmd_pgtable(pmd)	((pgtable_t) pmd_page_vaddr(pmd))



#endif /* _ASM_ARC_PGALLOC_H */

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