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Commit 458a3e64 authored by Tejun Heo's avatar Tejun Heo
Browse files

x86: update populate_extra_pte() and add populate_extra_pmd() 



Impact: minor change to populate_extra_pte() and addition of pmd flavor

Update populate_extra_pte() to return pointer to the pte_t for the
specified address and add populate_extra_pmd() which only populates
till the pmd and returns pointer to the pmd entry for the address.

For 64bit, pud/pmd/pte fill functions are separated out from
set_pte_vaddr[_pud]() and used for set_pte_vaddr[_pud]() and
populate_extra_{pte|pmd}().

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent c0c0a293

arch/x86/include/asm/pgtable.h

+2 −1
Original line number Diff line number Diff line
@@ -402,7 +402,8 @@ int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn, 


/* Install a pte for a particular vaddr in kernel space. */

void set_pte_vaddr(unsigned long vaddr, pte_t pte);

void populate_extra_pte(unsigned long vaddr);

pmd_t *populate_extra_pmd(unsigned long vaddr);

pte_t *populate_extra_pte(unsigned long vaddr);



#ifdef CONFIG_X86_32

extern void native_pagetable_setup_start(pgd_t *base);

arch/x86/kernel/setup_percpu.c

+6 −1
Original line number Diff line number Diff line
@@ -41,6 +41,11 @@ unsigned long __per_cpu_offset[NR_CPUS] __read_mostly = { 
};

EXPORT_SYMBOL(__per_cpu_offset);



static void __init pcpu4k_populate_pte(unsigned long addr)

{

	populate_extra_pte(addr);

}



static inline void setup_percpu_segment(int cpu)

{

#ifdef CONFIG_X86_32
@@ -104,7 +109,7 @@ void __init setup_per_cpu_areas(void) 
		}

	}



	pcpu_unit_size = pcpu_setup_static(populate_extra_pte, pages, size);

	pcpu_unit_size = pcpu_setup_static(pcpu4k_populate_pte, pages, size);



	free_bootmem(__pa(pages), pages_size);

arch/x86/mm/init_32.c

+10 −3
Original line number Diff line number Diff line
@@ -137,14 +137,21 @@ static pte_t * __init one_page_table_init(pmd_t *pmd) 
	return pte_offset_kernel(pmd, 0);

}



void __init populate_extra_pte(unsigned long vaddr)

pmd_t * __init populate_extra_pmd(unsigned long vaddr)

{

	int pgd_idx = pgd_index(vaddr);

	int pmd_idx = pmd_index(vaddr);



	return one_md_table_init(swapper_pg_dir + pgd_idx) + pmd_idx;

}



pte_t * __init populate_extra_pte(unsigned long vaddr)

{

	int pte_idx = pte_index(vaddr);

	pmd_t *pmd;



	pmd = one_md_table_init(swapper_pg_dir + pgd_idx);

	one_page_table_init(pmd + pmd_idx);

	pmd = populate_extra_pmd(vaddr);

	return one_page_table_init(pmd) + pte_idx;

}



static pte_t *__init page_table_kmap_check(pte_t *pte, pmd_t *pmd,

arch/x86/mm/init_64.c

+45 −30
Original line number Diff line number Diff line
@@ -168,34 +168,51 @@ static __ref void *spp_getpage(void) 
	return ptr;

}



void

set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte)

static pud_t * __init fill_pud(pgd_t *pgd, unsigned long vaddr)

{

	pud_t *pud;

	pmd_t *pmd;

	pte_t *pte;

	if (pgd_none(*pgd)) {

		pud_t *pud = (pud_t *)spp_getpage();

		pgd_populate(&init_mm, pgd, pud);

		if (pud != pud_offset(pgd, 0))

			printk(KERN_ERR "PAGETABLE BUG #00! %p <-> %p\n",

			       pud, pud_offset(pgd, 0));

	}

	return pud_offset(pgd, vaddr);

}



	pud = pud_page + pud_index(vaddr);

static pmd_t * __init fill_pmd(pud_t *pud, unsigned long vaddr)

{

	if (pud_none(*pud)) {

		pmd = (pmd_t *) spp_getpage();

		pmd_t *pmd = (pmd_t *) spp_getpage();

		pud_populate(&init_mm, pud, pmd);

		if (pmd != pmd_offset(pud, 0)) {

		if (pmd != pmd_offset(pud, 0))

			printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n",

			       pmd, pmd_offset(pud, 0));

			return;

	}

	return pmd_offset(pud, vaddr);

}

	pmd = pmd_offset(pud, vaddr);



static pte_t * __init fill_pte(pmd_t *pmd, unsigned long vaddr)

{

	if (pmd_none(*pmd)) {

		pte = (pte_t *) spp_getpage();

		pte_t *pte = (pte_t *) spp_getpage();

		pmd_populate_kernel(&init_mm, pmd, pte);

		if (pte != pte_offset_kernel(pmd, 0)) {

		if (pte != pte_offset_kernel(pmd, 0))

			printk(KERN_ERR "PAGETABLE BUG #02!\n");

			return;

	}

	return pte_offset_kernel(pmd, vaddr);

}



	pte = pte_offset_kernel(pmd, vaddr);

void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte)

{

	pud_t *pud;

	pmd_t *pmd;

	pte_t *pte;



	pud = pud_page + pud_index(vaddr);

	pmd = fill_pmd(pud, vaddr);

	pte = fill_pte(pmd, vaddr);



	set_pte(pte, new_pte);



	/*
@@ -205,8 +222,7 @@ set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte) 
	__flush_tlb_one(vaddr);

}



void

set_pte_vaddr(unsigned long vaddr, pte_t pteval)

void set_pte_vaddr(unsigned long vaddr, pte_t pteval)

{

	pgd_t *pgd;

	pud_t *pud_page;
@@ -223,23 +239,22 @@ set_pte_vaddr(unsigned long vaddr, pte_t pteval) 
	set_pte_vaddr_pud(pud_page, vaddr, pteval);

}



void __init populate_extra_pte(unsigned long vaddr)

pmd_t * __init populate_extra_pmd(unsigned long vaddr)

{

	pgd_t *pgd;

	pud_t *pud;



	pgd = pgd_offset_k(vaddr);

	if (pgd_none(*pgd)) {

		pud = (pud_t *)spp_getpage();

		pgd_populate(&init_mm, pgd, pud);

		if (pud != pud_offset(pgd, 0)) {

			printk(KERN_ERR "PAGETABLE BUG #00! %p <-> %p\n",

			       pud, pud_offset(pgd, 0));

			return;

		}

	pud = fill_pud(pgd, vaddr);

	return fill_pmd(pud, vaddr);

}



	set_pte_vaddr_pud((pud_t *)pgd_page_vaddr(*pgd), vaddr, __pte(0));

pte_t * __init populate_extra_pte(unsigned long vaddr)

{

	pmd_t *pmd;



	pmd = populate_extra_pmd(vaddr);

	return fill_pte(pmd, vaddr);

}



/*