[PATCH] unify PFN_* macros

Just about every architecture defines some macros to do operations on pfns.
 They're all virtually identical.  This patch consolidates all of them.

One minor glitch is that at least i386 uses them in a very skeletal header
file.  To keep away from #include dependency hell, I stuck the new
definitions in a new, isolated header.

Of all of the implementations, sh64 is the only one that varied by a bit.
It used some masks to ensure that any sign-extension got ripped away before
the arithmetic is done.  This has been posted to that sh64 maintainers and
the development list.

Compiles on x86, x86_64, ia64 and ppc64.

Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

23 files changed, 29 insertions, 68 deletions

diff --git a/arch/alpha/kernel/setup.c b/arch/alpha/kernel/setup.c
index b4e5f8f..9402624 100644
--- a/arch/alpha/kernel/setup.c
+++ b/arch/alpha/kernel/setup.c
@@ -34,6 +34,7 @@
 #include <linux/root_dev.h>
 #include <linux/initrd.h>
 #include <linux/eisa.h>
+#include <linux/pfn.h>
 #ifdef CONFIG_MAGIC_SYSRQ
 #include <linux/sysrq.h>
 #include <linux/reboot.h>
@@ -241,9 +242,6 @@ reserve_std_resources(void)
 		request_resource(io, standard_io_resources+i);
 }
 
-#define PFN_UP(x)	(((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
-#define PFN_DOWN(x)	((x) >> PAGE_SHIFT)
-#define PFN_PHYS(x)	((x) << PAGE_SHIFT)
 #define PFN_MAX		PFN_DOWN(0x80000000)
 #define for_each_mem_cluster(memdesc, cluster, i)		\
 	for ((cluster) = (memdesc)->cluster, (i) = 0;		\
@@ -472,11 +470,6 @@ page_is_ram(unsigned long pfn)
 	return 0;
 }
 
-#undef PFN_UP
-#undef PFN_DOWN
-#undef PFN_PHYS
-#undef PFN_MAX
-
 void __init
 setup_arch(char **cmdline_p)
 {
diff --git a/arch/alpha/mm/numa.c b/arch/alpha/mm/numa.c
index 6d52512..bf6b65c 100644
--- a/arch/alpha/mm/numa.c
+++ b/arch/alpha/mm/numa.c
@@ -13,6 +13,7 @@
 #include <linux/bootmem.h>
 #include <linux/swap.h>
 #include <linux/initrd.h>
+#include <linux/pfn.h>
 
 #include <asm/hwrpb.h>
 #include <asm/pgalloc.h>
@@ -27,9 +28,6 @@ bootmem_data_t node_bdata[MAX_NUMNODES];
 #define DBGDCONT(args...)
 #endif
 
-#define PFN_UP(x)       (((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
-#define PFN_DOWN(x)     ((x) >> PAGE_SHIFT)
-#define PFN_PHYS(x)     ((x) << PAGE_SHIFT)
 #define for_each_mem_cluster(memdesc, cluster, i)		\
 	for ((cluster) = (memdesc)->cluster, (i) = 0;		\
 	     (i) < (memdesc)->numclusters; (i)++, (cluster)++)
diff --git a/arch/arm26/mm/init.c b/arch/arm26/mm/init.c
index e3ecaa4..7da8a52 100644
--- a/arch/arm26/mm/init.c
+++ b/arch/arm26/mm/init.c
@@ -23,6 +23,7 @@
 #include <linux/initrd.h>
 #include <linux/bootmem.h>
 #include <linux/blkdev.h>
+#include <linux/pfn.h>
 
 #include <asm/segment.h>
 #include <asm/mach-types.h>
@@ -101,12 +102,6 @@ struct node_info {
 	int bootmap_pages;
 };
 
-#define PFN_DOWN(x)	((x) >> PAGE_SHIFT)
-#define PFN_UP(x)	(PAGE_ALIGN(x) >> PAGE_SHIFT)
-#define PFN_SIZE(x)	((x) >> PAGE_SHIFT)
-#define PFN_RANGE(s,e)	PFN_SIZE(PAGE_ALIGN((unsigned long)(e)) - \
-				(((unsigned long)(s)) & PAGE_MASK))
-
 /*
  * FIXME: We really want to avoid allocating the bootmap bitmap
  * over the top of the initrd.  Hopefully, this is located towards
diff --git a/arch/cris/kernel/setup.c b/arch/cris/kernel/setup.c
index 1ba57ef..619a6ee 100644
--- a/arch/cris/kernel/setup.c
+++ b/arch/cris/kernel/setup.c
@@ -18,6 +18,7 @@
 #include <linux/seq_file.h>
 #include <linux/tty.h>
 #include <linux/utsname.h>
+#include <linux/pfn.h>
 
 #include <asm/setup.h>
 
@@ -88,10 +89,6 @@ setup_arch(char **cmdline_p)
 	init_mm.end_data =   (unsigned long) &_edata;
 	init_mm.brk =        (unsigned long) &_end;
 
-#define PFN_UP(x)       (((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
-#define PFN_DOWN(x)     ((x) >> PAGE_SHIFT)
-#define PFN_PHYS(x)     ((x) << PAGE_SHIFT)
-
 	/* min_low_pfn points to the start of DRAM, start_pfn points
 	 * to the first DRAM pages after the kernel, and max_low_pfn
 	 * to the end of DRAM.
diff --git a/arch/i386/kernel/setup.c b/arch/i386/kernel/setup.c
index 6917daa..8c08660 100644
--- a/arch/i386/kernel/setup.c
+++ b/arch/i386/kernel/setup.c
@@ -46,6 +46,7 @@
 #include <linux/kexec.h>
 #include <linux/crash_dump.h>
 #include <linux/dmi.h>
+#include <linux/pfn.h>
 
 #include <video/edid.h>
 
diff --git a/arch/i386/mm/discontig.c b/arch/i386/mm/discontig.c
index c3f3ae9..fe6eb90 100644
--- a/arch/i386/mm/discontig.c
+++ b/arch/i386/mm/discontig.c
@@ -31,6 +31,7 @@
 #include <linux/nodemask.h>
 #include <linux/module.h>
 #include <linux/kexec.h>
+#include <linux/pfn.h>
 
 #include <asm/e820.h>
 #include <asm/setup.h>
diff --git a/arch/m32r/kernel/setup.c b/arch/m32r/kernel/setup.c
index d742037..0d78942 100644
--- a/arch/m32r/kernel/setup.c
+++ b/arch/m32r/kernel/setup.c
@@ -24,6 +24,7 @@
 #include <linux/tty.h>
 #include <linux/cpu.h>
 #include <linux/nodemask.h>
+#include <linux/pfn.h>
 
 #include <asm/processor.h>
 #include <asm/pgtable.h>
diff --git a/arch/m32r/mm/discontig.c b/arch/m32r/mm/discontig.c
index 70c8528..cf610a7 100644
--- a/arch/m32r/mm/discontig.c
+++ b/arch/m32r/mm/discontig.c
@@ -13,6 +13,7 @@
 #include <linux/initrd.h>
 #include <linux/nodemask.h>
 #include <linux/module.h>
+#include <linux/pfn.h>
 
 #include <asm/setup.h>
 
diff --git a/arch/m32r/mm/init.c b/arch/m32r/mm/init.c
index 2e0fe19..b71348f 100644
--- a/arch/m32r/mm/init.c
+++ b/arch/m32r/mm/init.c
@@ -18,6 +18,7 @@
 #include <linux/highmem.h>
 #include <linux/bitops.h>
 #include <linux/nodemask.h>
+#include <linux/pfn.h>
 #include <asm/types.h>
 #include <asm/processor.h>
 #include <asm/page.h>
diff --git a/arch/mips/ite-boards/ivr/init.c b/arch/mips/ite-boards/ivr/init.c
index ea4e193..b774db0 100644
--- a/arch/mips/ite-boards/ivr/init.c
+++ b/arch/mips/ite-boards/ivr/init.c
@@ -45,9 +45,6 @@ extern void  __init prom_init_cmdline(void);
 extern unsigned long __init prom_get_memsize(void);
 extern void __init it8172_init_ram_resource(unsigned long memsize);
 
-#define PFN_UP(x)	(((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
-#define PFN_ALIGN(x)	(((unsigned long)(x) + (PAGE_SIZE - 1)) & PAGE_MASK)
-
 const char *get_system_type(void)
 {
 	return "Globespan IVR";
diff --git a/arch/mips/ite-boards/qed-4n-s01b/init.c b/arch/mips/ite-boards/qed-4n-s01b/init.c
index 56dca7e..e8ec8be 100644
--- a/arch/mips/ite-boards/qed-4n-s01b/init.c
+++ b/arch/mips/ite-boards/qed-4n-s01b/init.c
@@ -45,9 +45,6 @@ extern void  __init prom_init_cmdline(void);
 extern unsigned long __init prom_get_memsize(void);
 extern void __init it8172_init_ram_resource(unsigned long memsize);
 
-#define PFN_UP(x)	(((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
-#define PFN_ALIGN(x)	(((unsigned long)(x) + (PAGE_SIZE - 1)) & PAGE_MASK)
-
 const char *get_system_type(void)
 {
 	return "ITE QED-4N-S01B";
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index 0cb3b60..dcbfd27 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -34,6 +34,7 @@
 #include <linux/highmem.h>
 #include <linux/console.h>
 #include <linux/mmzone.h>
+#include <linux/pfn.h>
 
 #include <asm/addrspace.h>
 #include <asm/bootinfo.h>
@@ -257,10 +258,6 @@ static inline int parse_rd_cmdline(unsigned long* rd_start, unsigned long* rd_en
 	return 0;
 }
 
-#define PFN_UP(x)	(((x) + PAGE_SIZE - 1) >> PAGE_SHIFT)
-#define PFN_DOWN(x)	((x) >> PAGE_SHIFT)
-#define PFN_PHYS(x)	((x) << PAGE_SHIFT)
-
 #define MAXMEM		HIGHMEM_START
 #define MAXMEM_PFN	PFN_DOWN(MAXMEM)
 
@@ -493,10 +490,6 @@ static inline void resource_init(void)
 	}
 }
 
-#undef PFN_UP
-#undef PFN_DOWN
-#undef PFN_PHYS
-
 #undef MAXMEM
 #undef MAXMEM_PFN
 
diff --git a/arch/mips/mips-boards/generic/memory.c b/arch/mips/mips-boards/generic/memory.c
index ee5e70c..32c9210 100644
--- a/arch/mips/mips-boards/generic/memory.c
+++ b/arch/mips/mips-boards/generic/memory.c
@@ -49,9 +49,6 @@ static char *mtypes[3] = {
 /* References to section boundaries */
 extern char _end;
 
-#define PFN_ALIGN(x)    (((unsigned long)(x) + (PAGE_SIZE - 1)) & PAGE_MASK)
-
-
 struct prom_pmemblock * __init prom_getmdesc(void)
 {
 	char *memsize_str;
@@ -109,10 +106,10 @@ struct prom_pmemblock * __init prom_getmdesc(void)
 
 	mdesc[3].type = yamon_dontuse;
 	mdesc[3].base = 0x00100000;
-	mdesc[3].size = CPHYSADDR(PFN_ALIGN(&_end)) - mdesc[3].base;
+	mdesc[3].size = CPHYSADDR(PAGE_ALIGN(&_end)) - mdesc[3].base;
 
 	mdesc[4].type = yamon_free;
-	mdesc[4].base = CPHYSADDR(PFN_ALIGN(&_end));
+	mdesc[4].base = CPHYSADDR(PAGE_ALIGN(&_end));
 	mdesc[4].size = memsize - mdesc[4].base;
 
 	return &mdesc[0];
diff --git a/arch/mips/mips-boards/sim/sim_mem.c b/arch/mips/mips-boards/sim/sim_mem.c
index 1ec4e75..e57f737 100644
--- a/arch/mips/mips-boards/sim/sim_mem.c
+++ b/arch/mips/mips-boards/sim/sim_mem.c
@@ -42,9 +42,6 @@ static char *mtypes[3] = {
 /* References to section boundaries */
 extern char _end;
 
-#define PFN_ALIGN(x)    (((unsigned long)(x) + (PAGE_SIZE - 1)) & PAGE_MASK)
-
-
 struct prom_pmemblock * __init prom_getmdesc(void)
 {
 	unsigned int memsize;
@@ -64,10 +61,10 @@ struct prom_pmemblock * __init prom_getmdesc(void)
 
 	mdesc[2].type = simmem_reserved;
 	mdesc[2].base = 0x00100000;
-	mdesc[2].size = CPHYSADDR(PFN_ALIGN(&_end)) - mdesc[2].base;
+	mdesc[2].size = CPHYSADDR(PAGE_ALIGN(&_end)) - mdesc[2].base;
 
 	mdesc[3].type = simmem_free;
-	mdesc[3].base = CPHYSADDR(PFN_ALIGN(&_end));
+	mdesc[3].base = CPHYSADDR(PAGE_ALIGN(&_end));
 	mdesc[3].size = memsize - mdesc[3].base;
 
 	return &mdesc[0];
diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c
index 52f7d59..ad89c44 100644
--- a/arch/mips/mm/init.c
+++ b/arch/mips/mm/init.c
@@ -25,6 +25,7 @@
 #include <linux/highmem.h>
 #include <linux/swap.h>
 #include <linux/proc_fs.h>
+#include <linux/pfn.h>
 
 #include <asm/bootinfo.h>
 #include <asm/cachectl.h>
@@ -177,9 +178,6 @@ void __init paging_init(void)
 	free_area_init(zones_size);
 }
 
-#define PFN_UP(x)	(((x) + PAGE_SIZE - 1) >> PAGE_SHIFT)
-#define PFN_DOWN(x)	((x) >> PAGE_SHIFT)
-
 static inline int page_is_ram(unsigned long pagenr)
 {
 	int i;
diff --git a/arch/mips/sgi-ip27/ip27-memory.c b/arch/mips/sgi-ip27/ip27-memory.c
index e0d095d..6c00dce 100644
--- a/arch/mips/sgi-ip27/ip27-memory.c
+++ b/arch/mips/sgi-ip27/ip27-memory.c
@@ -19,6 +19,7 @@
 #include <linux/nodemask.h>
 #include <linux/swap.h>
 #include <linux/bootmem.h>
+#include <linux/pfn.h>
 #include <asm/page.h>
 #include <asm/sections.h>
 
@@ -28,8 +29,6 @@
 #include <asm/sn/sn_private.h>
 
 
-#define PFN_UP(x)		(((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
-
 #define SLOT_PFNSHIFT           (SLOT_SHIFT - PAGE_SHIFT)
 #define PFN_NASIDSHFT           (NASID_SHFT - PAGE_SHIFT)
 
diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
index c0e79843..7ee4ca2 100644
--- a/arch/sh/kernel/setup.c
+++ b/arch/sh/kernel/setup.c
@@ -20,6 +20,7 @@
 #include <linux/root_dev.h>
 #include <linux/utsname.h>
 #include <linux/cpu.h>
+#include <linux/pfn.h>
 #include <asm/uaccess.h>
 #include <asm/io.h>
 #include <asm/sections.h>
@@ -275,10 +276,6 @@ void __init setup_arch(char **cmdline_p)
 
 	sh_mv_setup(cmdline_p);
 
-#define PFN_UP(x)	(((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
-#define PFN_DOWN(x)	((x) >> PAGE_SHIFT)
-#define PFN_PHYS(x)	((x) << PAGE_SHIFT)
-
 	/*
 	 * Find the highest page frame number we have available
 	 */
diff --git a/arch/sh64/kernel/setup.c b/arch/sh64/kernel/setup.c
index c7a7b816..d2711c9 100644
--- a/arch/sh64/kernel/setup.c
+++ b/arch/sh64/kernel/setup.c
@@ -48,6 +48,7 @@
 #include <linux/root_dev.h>
 #include <linux/cpu.h>
 #include <linux/initrd.h>
+#include <linux/pfn.h>
 #include <asm/processor.h>
 #include <asm/page.h>
 #include <asm/pgtable.h>
diff --git a/arch/um/kernel/physmem.c b/arch/um/kernel/physmem.c
index 0e65340..0500800 100644
--- a/arch/um/kernel/physmem.c
+++ b/arch/um/kernel/physmem.c
@@ -9,6 +9,7 @@
 #include "linux/vmalloc.h"
 #include "linux/bootmem.h"
 #include "linux/module.h"
+#include "linux/pfn.h"
 #include "asm/types.h"
 #include "asm/pgtable.h"
 #include "kern_util.h"
@@ -316,8 +317,6 @@ void map_memory(unsigned long virt, unsigned long phys, unsigned long len,
 	}
 }
 
-#define PFN_UP(x) (((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
-
 extern int __syscall_stub_start, __binary_start;
 
 void setup_physmem(unsigned long start, unsigned long reserve_end,
diff --git a/include/asm-i386/setup.h b/include/asm-i386/setup.h
index 826a8ca..ee94145 100644
--- a/include/asm-i386/setup.h
+++ b/include/asm-i386/setup.h
@@ -6,9 +6,7 @@
 #ifndef _i386_SETUP_H
 #define _i386_SETUP_H
 
-#define PFN_UP(x)	(((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
-#define PFN_DOWN(x)	((x) >> PAGE_SHIFT)
-#define PFN_PHYS(x)	((x) << PAGE_SHIFT)
+#include <linux/pfn.h>
 
 /*
  * Reserved space for vmalloc and iomap - defined in asm/page.h
diff --git a/include/asm-m32r/setup.h b/include/asm-m32r/setup.h
index 5f028dc..52f4fa2 100644
--- a/include/asm-m32r/setup.h
+++ b/include/asm-m32r/setup.h
@@ -24,10 +24,6 @@
 #define RAMDISK_PROMPT_FLAG		(0x8000)
 #define RAMDISK_LOAD_FLAG		(0x4000)
 
-#define PFN_UP(x)	(((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
-#define PFN_DOWN(x)	((x) >> PAGE_SHIFT)
-#define PFN_PHYS(x)	((x) << PAGE_SHIFT)
-
 extern unsigned long memory_start;
 extern unsigned long memory_end;
 
diff --git a/include/asm-sh64/platform.h b/include/asm-sh64/platform.h
index 7046a90..bd0d9c4 100644
--- a/include/asm-sh64/platform.h
+++ b/include/asm-sh64/platform.h
@@ -61,9 +61,4 @@ extern int platform_int_priority[NR_INTC_IRQS];
 #define code_resource (platform_parms.kram_res_p[STANDARD_KRAM_RESOURCES - 2])
 #define data_resource (platform_parms.kram_res_p[STANDARD_KRAM_RESOURCES - 1])
 
-/* Be prepared to 64-bit sign extensions */
-#define PFN_UP(x)       ((((x) + PAGE_SIZE-1) >> PAGE_SHIFT) & 0x000fffff)
-#define PFN_DOWN(x)     (((x) >> PAGE_SHIFT) & 0x000fffff)
-#define PFN_PHYS(x)     ((x) << PAGE_SHIFT)
-
 #endif	/* __ASM_SH64_PLATFORM_H */
diff --git a/include/linux/pfn.h b/include/linux/pfn.h
new file mode 100644
index 0000000..bb01f8b
--- /dev/null
+++ b/include/linux/pfn.h
@@ -0,0 +1,9 @@
+#ifndef _LINUX_PFN_H_
+#define _LINUX_PFN_H_
+
+#define PFN_ALIGN(x)	(((unsigned long)(x) + (PAGE_SIZE - 1)) & PAGE_MASK)
+#define PFN_UP(x)	(((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
+#define PFN_DOWN(x)	((x) >> PAGE_SHIFT)
+#define PFN_PHYS(x)	((x) << PAGE_SHIFT)
+
+#endif