Commit 5c51bdbe authored by Yinghai Lu's avatar Yinghai Lu Committed by H. Peter Anvin
Browse files

x86, mm: Merge alloc_low_page between 64bit and 32bit 



They are almost same except 64 bit need to handle after_bootmem case.

Add mm_internal.h to make that alloc_low_page() only to be accessible
from arch/x86/mm/init*.c

Signed-off-by: default avatarYinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/1353123563-3103-25-git-send-email-yinghai@kernel.org


Signed-off-by: default avatarH. Peter Anvin <hpa@linux.intel.com>
parent 868bf4d6

arch/x86/mm/init.c

+34 −0
Original line number Diff line number Diff line
@@ -17,10 +17,44 @@ 
#include <asm/proto.h>

#include <asm/dma.h>		/* for MAX_DMA_PFN */



#include "mm_internal.h"



unsigned long __initdata pgt_buf_start;

unsigned long __meminitdata pgt_buf_end;

unsigned long __meminitdata pgt_buf_top;



__ref void *alloc_low_page(void)

{

	unsigned long pfn;

	void *adr;



#ifdef CONFIG_X86_64

	if (after_bootmem) {

		adr = (void *)get_zeroed_page(GFP_ATOMIC | __GFP_NOTRACK);



		return adr;

	}

#endif



	if ((pgt_buf_end + 1) >= pgt_buf_top) {

		unsigned long ret;

		if (min_pfn_mapped >= max_pfn_mapped)

			panic("alloc_low_page: ran out of memory");

		ret = memblock_find_in_range(min_pfn_mapped << PAGE_SHIFT,

					max_pfn_mapped << PAGE_SHIFT,

					PAGE_SIZE, PAGE_SIZE);

		if (!ret)

			panic("alloc_low_page: can not alloc memory");

		memblock_reserve(ret, PAGE_SIZE);

		pfn = ret >> PAGE_SHIFT;

	} else

		pfn = pgt_buf_end++;



	adr = __va(pfn * PAGE_SIZE);

	clear_page(adr);

	return adr;

}



/* need 4 4k for initial PMD_SIZE, 4k for 0-ISA_END_ADDRESS */

#define INIT_PGT_BUF_SIZE	(5 * PAGE_SIZE)

RESERVE_BRK(early_pgt_alloc, INIT_PGT_BUF_SIZE);

arch/x86/mm/init_32.c

+2 −24
Original line number Diff line number Diff line
@@ -53,36 +53,14 @@ 
#include <asm/page_types.h>

#include <asm/init.h>



#include "mm_internal.h"



unsigned long highstart_pfn, highend_pfn;



static noinline int do_test_wp_bit(void);



bool __read_mostly __vmalloc_start_set = false;



static __init void *alloc_low_page(void)

{

	unsigned long pfn;

	void *adr;



	if ((pgt_buf_end + 1) >= pgt_buf_top) {

		unsigned long ret;

		if (min_pfn_mapped >= max_pfn_mapped)

			panic("alloc_low_page: ran out of memory");

		ret = memblock_find_in_range(min_pfn_mapped << PAGE_SHIFT,

					max_pfn_mapped << PAGE_SHIFT,

					PAGE_SIZE, PAGE_SIZE);

		if (!ret)

			panic("alloc_low_page: can not alloc memory");

		memblock_reserve(ret, PAGE_SIZE);

		pfn = ret >> PAGE_SHIFT;

	} else

		pfn = pgt_buf_end++;



	adr = __va(pfn * PAGE_SIZE);

	clear_page(adr);

	return adr;

}



/*

 * Creates a middle page table and puts a pointer to it in the

 * given global directory entry. This only returns the gd entry

arch/x86/mm/init_64.c

+2 −30
Original line number Diff line number Diff line
@@ -54,6 +54,8 @@ 
#include <asm/uv/uv.h>

#include <asm/setup.h>



#include "mm_internal.h"



static int __init parse_direct_gbpages_off(char *arg)

{

	direct_gbpages = 0;
@@ -314,36 +316,6 @@ void __init cleanup_highmap(void) 
	}

}



static __ref void *alloc_low_page(void)

{

	unsigned long pfn;

	void *adr;



	if (after_bootmem) {

		adr = (void *)get_zeroed_page(GFP_ATOMIC | __GFP_NOTRACK);



		return adr;

	}



	if ((pgt_buf_end + 1) >= pgt_buf_top) {

		unsigned long ret;

		if (min_pfn_mapped >= max_pfn_mapped)

			panic("alloc_low_page: ran out of memory");

		ret = memblock_find_in_range(min_pfn_mapped << PAGE_SHIFT,

					max_pfn_mapped << PAGE_SHIFT,

					PAGE_SIZE, PAGE_SIZE);

		if (!ret)

			panic("alloc_low_page: can not alloc memory");

		memblock_reserve(ret, PAGE_SIZE);

		pfn = ret >> PAGE_SHIFT;

	} else

		pfn = pgt_buf_end++;



	adr = __va(pfn * PAGE_SIZE);

	clear_page(adr);

	return adr;

}



static unsigned long __meminit

phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end,

	      pgprot_t prot)

arch/x86/mm/mm_internal.h

0 → 100644
+6 −0
Original line number Diff line number Diff line 
#ifndef __X86_MM_INTERNAL_H

#define __X86_MM_INTERNAL_H



void *alloc_low_page(void);



#endif	/* __X86_MM_INTERNAL_H */

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