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Subject[PATCH 24/46] x86, mm: Merge alloc_low_page between 64bit and 32bit
Date
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: Yinghai Lu <yinghai@kernel.org>
---
arch/x86/mm/init.c | 34 ++++++++++++++++++++++++++++++++++
arch/x86/mm/init_32.c | 26 ++------------------------
arch/x86/mm/init_64.c | 32 ++------------------------------
arch/x86/mm/mm_internal.h | 6 ++++++
4 files changed, 44 insertions(+), 54 deletions(-)
create mode 100644 arch/x86/mm/mm_internal.h

diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index 76a6e82..ffbb7af 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -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);
diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index 7bb1106..a7f2df1 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -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
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 1960820..1d53def 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -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)
diff --git a/arch/x86/mm/mm_internal.h b/arch/x86/mm/mm_internal.h
new file mode 100644
index 0000000..b3f993a
--- /dev/null
+++ b/arch/x86/mm/mm_internal.h
@@ -0,0 +1,6 @@
+#ifndef __X86_MM_INTERNAL_H
+#define __X86_MM_INTERNAL_H
+
+void *alloc_low_page(void);
+
+#endif /* __X86_MM_INTERNAL_H */
--
1.7.7


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