Commit 4d66bcc7 authored by Kirill A. Shutemov's avatar Kirill A. Shutemov Committed by Linus Torvalds
Browse files

ia64: expose number of page table levels on Kconfig level 



We would want to use number of page table level to define mm_struct.
Let's expose it as CONFIG_PGTABLE_LEVELS.

We need to define PGTABLE_LEVELS before sourcing init/Kconfig:
arch/Kconfig will define default value and it's sourced from init/Kconfig.

Signed-off-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Tested-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 1bcad26e

arch/ia64/Kconfig

+5 −13
Original line number Diff line number Diff line 
config PGTABLE_LEVELS

	int "Page Table Levels" if !IA64_PAGE_SIZE_64KB

	range 3 4 if !IA64_PAGE_SIZE_64KB

	default 3



source "init/Kconfig"



source "kernel/Kconfig.freezer"
@@ -286,19 +291,6 @@ config IA64_PAGE_SIZE_64KB 


endchoice



choice

	prompt "Page Table Levels"

	default PGTABLE_3



config PGTABLE_3

	bool "3 Levels"



config PGTABLE_4

	depends on !IA64_PAGE_SIZE_64KB

	bool "4 Levels"



endchoice



if IA64_HP_SIM

config HZ

	default 32

arch/ia64/include/asm/page.h

+2 −2
Original line number Diff line number Diff line
@@ -173,7 +173,7 @@ get_order (unsigned long size) 
   */

  typedef struct { unsigned long pte; } pte_t;

  typedef struct { unsigned long pmd; } pmd_t;

#ifdef CONFIG_PGTABLE_4

#if CONFIG_PGTABLE_LEVELS == 4

  typedef struct { unsigned long pud; } pud_t;

#endif

  typedef struct { unsigned long pgd; } pgd_t;
@@ -182,7 +182,7 @@ get_order (unsigned long size) 


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

# define pmd_val(x)	((x).pmd)

#ifdef CONFIG_PGTABLE_4

#if CONFIG_PGTABLE_LEVELS == 4

# define pud_val(x)	((x).pud)

#endif

# define pgd_val(x)	((x).pgd)

arch/ia64/include/asm/pgalloc.h

+2 −2
Original line number Diff line number Diff line
@@ -32,7 +32,7 @@ static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) 
	quicklist_free(0, NULL, pgd);

}



#ifdef CONFIG_PGTABLE_4

#if CONFIG_PGTABLE_LEVELS == 4

static inline void

pgd_populate(struct mm_struct *mm, pgd_t * pgd_entry, pud_t * pud)

{
@@ -49,7 +49,7 @@ static inline void pud_free(struct mm_struct *mm, pud_t *pud) 
	quicklist_free(0, NULL, pud);

}

#define __pud_free_tlb(tlb, pud, address)	pud_free((tlb)->mm, pud)

#endif /* CONFIG_PGTABLE_4 */

#endif /* CONFIG_PGTABLE_LEVELS == 4 */



static inline void

pud_populate(struct mm_struct *mm, pud_t * pud_entry, pmd_t * pmd)

arch/ia64/include/asm/pgtable.h

+6 −6
Original line number Diff line number Diff line
@@ -99,7 +99,7 @@ 
#define PMD_MASK	(~(PMD_SIZE-1))

#define PTRS_PER_PMD	(1UL << (PTRS_PER_PTD_SHIFT))



#ifdef CONFIG_PGTABLE_4

#if CONFIG_PGTABLE_LEVELS == 4

/*

 * Definitions for second level:

 *
@@ -117,7 +117,7 @@ 
 *

 * PGDIR_SHIFT determines what a first-level page table entry can map.

 */

#ifdef CONFIG_PGTABLE_4

#if CONFIG_PGTABLE_LEVELS == 4

#define PGDIR_SHIFT		(PUD_SHIFT + (PTRS_PER_PTD_SHIFT))

#else

#define PGDIR_SHIFT		(PMD_SHIFT + (PTRS_PER_PTD_SHIFT))
@@ -180,7 +180,7 @@ 
#define __S111	__pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_RWX)



#define pgd_ERROR(e)	printk("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e))

#ifdef CONFIG_PGTABLE_4

#if CONFIG_PGTABLE_LEVELS == 4

#define pud_ERROR(e)	printk("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e))

#endif

#define pmd_ERROR(e)	printk("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))
@@ -281,7 +281,7 @@ extern unsigned long VMALLOC_END; 
#define pud_page_vaddr(pud)		((unsigned long) __va(pud_val(pud) & _PFN_MASK))

#define pud_page(pud)			virt_to_page((pud_val(pud) + PAGE_OFFSET))



#ifdef CONFIG_PGTABLE_4

#if CONFIG_PGTABLE_LEVELS == 4

#define pgd_none(pgd)			(!pgd_val(pgd))

#define pgd_bad(pgd)			(!ia64_phys_addr_valid(pgd_val(pgd)))

#define pgd_present(pgd)		(pgd_val(pgd) != 0UL)
@@ -384,7 +384,7 @@ pgd_offset (const struct mm_struct *mm, unsigned long address) 
   here.  */

#define pgd_offset_gate(mm, addr)	pgd_offset_k(addr)



#ifdef CONFIG_PGTABLE_4

#if CONFIG_PGTABLE_LEVELS == 4

/* Find an entry in the second-level page table.. */

#define pud_offset(dir,addr) \

	((pud_t *) pgd_page_vaddr(*(dir)) + (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1)))
@@ -586,7 +586,7 @@ extern struct page *zero_page_memmap_ptr; 
#define __HAVE_ARCH_PGD_OFFSET_GATE





#ifndef CONFIG_PGTABLE_4

#if CONFIG_PGTABLE_LEVELS == 3

#include <asm-generic/pgtable-nopud.h>

#endif

#include <asm-generic/pgtable.h>

arch/ia64/kernel/ivt.S

+6 −6
Original line number Diff line number Diff line
@@ -146,7 +146,7 @@ ENTRY(vhpt_miss) 
(p6)	dep r17=r18,r19,3,(PAGE_SHIFT-3)	// r17=pgd_offset for region 5

(p7)	dep r17=r18,r17,3,(PAGE_SHIFT-6)	// r17=pgd_offset for region[0-4]

	cmp.eq p7,p6=0,r21			// unused address bits all zeroes?

#ifdef CONFIG_PGTABLE_4

#if CONFIG_PGTABLE_LEVELS == 4

	shr.u r28=r22,PUD_SHIFT			// shift pud index into position

#else

	shr.u r18=r22,PMD_SHIFT			// shift pmd index into position
@@ -155,7 +155,7 @@ ENTRY(vhpt_miss) 
	ld8 r17=[r17]				// get *pgd (may be 0)

	;;

(p7)	cmp.eq p6,p7=r17,r0			// was pgd_present(*pgd) == NULL?

#ifdef CONFIG_PGTABLE_4

#if CONFIG_PGTABLE_LEVELS == 4

	dep r28=r28,r17,3,(PAGE_SHIFT-3)	// r28=pud_offset(pgd,addr)

	;;

	shr.u r18=r22,PMD_SHIFT			// shift pmd index into position
@@ -222,13 +222,13 @@ ENTRY(vhpt_miss) 
	 */

	ld8 r25=[r21]				// read *pte again

	ld8 r26=[r17]				// read *pmd again

#ifdef CONFIG_PGTABLE_4

#if CONFIG_PGTABLE_LEVELS == 4

	ld8 r19=[r28]				// read *pud again

#endif

	cmp.ne p6,p7=r0,r0

	;;

	cmp.ne.or.andcm p6,p7=r26,r20		// did *pmd change

#ifdef CONFIG_PGTABLE_4

#if CONFIG_PGTABLE_LEVELS == 4

	cmp.ne.or.andcm p6,p7=r19,r29		// did *pud change

#endif

	mov r27=PAGE_SHIFT<<2
@@ -476,7 +476,7 @@ ENTRY(nested_dtlb_miss) 
(p6)	dep r17=r18,r19,3,(PAGE_SHIFT-3)	// r17=pgd_offset for region 5

(p7)	dep r17=r18,r17,3,(PAGE_SHIFT-6)	// r17=pgd_offset for region[0-4]

	cmp.eq p7,p6=0,r21			// unused address bits all zeroes?

#ifdef CONFIG_PGTABLE_4

#if CONFIG_PGTABLE_LEVELS == 4

	shr.u r18=r22,PUD_SHIFT			// shift pud index into position

#else

	shr.u r18=r22,PMD_SHIFT			// shift pmd index into position
@@ -487,7 +487,7 @@ ENTRY(nested_dtlb_miss) 
(p7)	cmp.eq p6,p7=r17,r0			// was pgd_present(*pgd) == NULL?

	dep r17=r18,r17,3,(PAGE_SHIFT-3)	// r17=p[u|m]d_offset(pgd,addr)

	;;

#ifdef CONFIG_PGTABLE_4

#if CONFIG_PGTABLE_LEVELS == 4

(p7)	ld8 r17=[r17]				// get *pud (may be 0)

	shr.u r18=r22,PMD_SHIFT			// shift pmd index into position

	;;

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