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From: Max Kellermann <max.kellermann@ionos.com>
To: akpm@linux-foundation.org,
	linux-mm@kvack.org,
	linux-kernel@vger.kernel.org
Cc: willy@infradead.org,
	sfr@canb.auug.org.au,
	Max Kellermann <max.kellermann@ionos.com>
Subject: [PATCH v4 14/15] linux/mm.h: move high_memory to mm/high_memory.h
Date: Tue, 12 Mar 2024 10:41:32 +0100
Message-Id: <20240312094133.2084996-15-max.kellermann@ionos.com>
In-Reply-To: <20240312094133.2084996-1-max.kellermann@ionos.com>
References: <20240312094133.2084996-1-max.kellermann@ionos.com>
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This variable is used by lots of arch/*/include/asm/ headers, but
these do not (and should not) include the huge linux/mm.h header.
Let's move this "extern" variable to a separate header and include
this one in arch/.

Signed-off-by: Max Kellermann <max.kellermann@ionos.com>
---
 arch/arm/include/asm/memory.h                | 4 ++++
 arch/arm/include/asm/pgtable.h               | 2 ++
 arch/csky/include/asm/page.h                 | 1 +
 arch/hexagon/include/asm/mem-layout.h        | 4 ++++
 arch/m68k/include/asm/page_mm.h              | 1 +
 arch/m68k/include/asm/pgtable_mm.h           | 1 +
 arch/parisc/include/asm/floppy.h             | 1 +
 arch/powerpc/include/asm/book3s/32/pgtable.h | 4 ++++
 arch/powerpc/include/asm/nohash/32/pgtable.h | 1 +
 arch/powerpc/include/asm/page.h              | 1 +
 arch/x86/include/asm/floppy.h                | 1 +
 arch/x86/include/asm/pgtable_32_areas.h      | 4 ++++
 drivers/mtd/nand/onenand/onenand_samsung.c   | 1 +
 include/linux/mm.h                           | 2 +-
 include/linux/mm/high_memory.h               | 7 +++++++
 15 files changed, 34 insertions(+), 1 deletion(-)
 create mode 100644 include/linux/mm/high_memory.h

diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
index ef2aa79ece5a..a67afb213e2e 100644
--- a/arch/arm/include/asm/memory.h
+++ b/arch/arm/include/asm/memory.h
@@ -387,6 +387,10 @@ static inline unsigned long __virt_to_idmap(unsigned long x)
  */
 #define ARCH_PFN_OFFSET		PHYS_PFN_OFFSET
 
+#ifndef __ASSEMBLY__
+#include <linux/mm/high_memory.h>
+#endif
+
 #define virt_to_page(kaddr)	pfn_to_page(virt_to_pfn(kaddr))
 #define virt_addr_valid(kaddr)	(((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \
 					&& pfn_valid(virt_to_pfn(kaddr)))
diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h
index be91e376df79..eb80f6a65619 100644
--- a/arch/arm/include/asm/pgtable.h
+++ b/arch/arm/include/asm/pgtable.h
@@ -11,6 +11,8 @@
 #include <asm/proc-fns.h>
 
 #ifndef __ASSEMBLY__
+#include <linux/mm/high_memory.h>
+
 /*
  * ZERO_PAGE is a global shared page that is always zero: used
  * for zero-mapped memory areas etc..
diff --git a/arch/csky/include/asm/page.h b/arch/csky/include/asm/page.h
index 0ca6c408c07f..17ccc91c3cd6 100644
--- a/arch/csky/include/asm/page.h
+++ b/arch/csky/include/asm/page.h
@@ -32,6 +32,7 @@
 
 #ifndef __ASSEMBLY__
 
+#include <linux/mm/high_memory.h>
 #include <linux/pfn.h>
 
 #define virt_addr_valid(kaddr)  ((void *)(kaddr) >= (void *)PAGE_OFFSET && \
diff --git a/arch/hexagon/include/asm/mem-layout.h b/arch/hexagon/include/asm/mem-layout.h
index e2f99413fe56..a09116c50043 100644
--- a/arch/hexagon/include/asm/mem-layout.h
+++ b/arch/hexagon/include/asm/mem-layout.h
@@ -10,6 +10,10 @@
 
 #include <linux/const.h>
 
+#ifndef __ASSEMBLY__
+#include <linux/mm/high_memory.h>
+#endif
+
 /*
  * Have to do this for ginormous numbers, else they get printed as
  * negative numbers, which the linker no likey when you try to
diff --git a/arch/m68k/include/asm/page_mm.h b/arch/m68k/include/asm/page_mm.h
index e0ae4d5fc985..f958655d1931 100644
--- a/arch/m68k/include/asm/page_mm.h
+++ b/arch/m68k/include/asm/page_mm.h
@@ -5,6 +5,7 @@
 #ifndef __ASSEMBLY__
 
 #include <linux/compiler.h>
+#include <linux/mm/high_memory.h>
 #include <asm/module.h>
 
 /*
diff --git a/arch/m68k/include/asm/pgtable_mm.h b/arch/m68k/include/asm/pgtable_mm.h
index dbdf1c2b2f66..ec593656bdc5 100644
--- a/arch/m68k/include/asm/pgtable_mm.h
+++ b/arch/m68k/include/asm/pgtable_mm.h
@@ -13,6 +13,7 @@
 
 #ifndef __ASSEMBLY__
 #include <asm/processor.h>
+#include <linux/mm/high_memory.h>
 #include <linux/sched.h>
 #include <linux/threads.h>
 
diff --git a/arch/parisc/include/asm/floppy.h b/arch/parisc/include/asm/floppy.h
index b318a7df52f6..98ed37c5dc59 100644
--- a/arch/parisc/include/asm/floppy.h
+++ b/arch/parisc/include/asm/floppy.h
@@ -8,6 +8,7 @@
 #ifndef __ASM_PARISC_FLOPPY_H
 #define __ASM_PARISC_FLOPPY_H
 
+#include <linux/mm/high_memory.h>
 #include <linux/vmalloc.h>
 
 
diff --git a/arch/powerpc/include/asm/book3s/32/pgtable.h b/arch/powerpc/include/asm/book3s/32/pgtable.h
index 52971ee30717..03e0a32e1c2c 100644
--- a/arch/powerpc/include/asm/book3s/32/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/32/pgtable.h
@@ -4,6 +4,10 @@
 
 #include <asm-generic/pgtable-nopmd.h>
 
+#ifndef __ASSEMBLY__
+#include <linux/mm/high_memory.h>
+#endif
+
 /*
  * The "classic" 32-bit implementation of the PowerPC MMU uses a hash
  * table containing PTEs, together with a set of 16 segment registers,
diff --git a/arch/powerpc/include/asm/nohash/32/pgtable.h b/arch/powerpc/include/asm/nohash/32/pgtable.h
index 9164a9e41b02..8a9f5b546e4a 100644
--- a/arch/powerpc/include/asm/nohash/32/pgtable.h
+++ b/arch/powerpc/include/asm/nohash/32/pgtable.h
@@ -5,6 +5,7 @@
 #include <asm-generic/pgtable-nopmd.h>
 
 #ifndef __ASSEMBLY__
+#include <linux/mm/high_memory.h>
 #include <linux/sched.h>
 #include <linux/threads.h>
 #include <asm/mmu.h>			/* For sub-arch specific PPC_PIN_SIZE */
diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h
index e411e5a70ea3..9ae87fc2c648 100644
--- a/arch/powerpc/include/asm/page.h
+++ b/arch/powerpc/include/asm/page.h
@@ -7,6 +7,7 @@
  */
 
 #ifndef __ASSEMBLY__
+#include <linux/mm/high_memory.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
 #include <linux/bug.h>
diff --git a/arch/x86/include/asm/floppy.h b/arch/x86/include/asm/floppy.h
index 6ec3fc969ad5..7756e984f146 100644
--- a/arch/x86/include/asm/floppy.h
+++ b/arch/x86/include/asm/floppy.h
@@ -10,6 +10,7 @@
 #ifndef _ASM_X86_FLOPPY_H
 #define _ASM_X86_FLOPPY_H
 
+#include <linux/mm/high_memory.h>
 #include <linux/vmalloc.h>
 
 /*
diff --git a/arch/x86/include/asm/pgtable_32_areas.h b/arch/x86/include/asm/pgtable_32_areas.h
index b6355416a15a..b339137b4f4e 100644
--- a/arch/x86/include/asm/pgtable_32_areas.h
+++ b/arch/x86/include/asm/pgtable_32_areas.h
@@ -3,6 +3,10 @@
 
 #include <asm/cpu_entry_area.h>
 
+#ifndef __ASSEMBLY__
+#include <linux/mm/high_memory.h>
+#endif
+
 /*
  * Just any arbitrary offset to the start of the vmalloc VM area: the
  * current 8MB value just means that there will be a 8MB "hole" after the
diff --git a/drivers/mtd/nand/onenand/onenand_samsung.c b/drivers/mtd/nand/onenand/onenand_samsung.c
index fd6890a03d55..7c3cc270386d 100644
--- a/drivers/mtd/nand/onenand/onenand_samsung.c
+++ b/drivers/mtd/nand/onenand/onenand_samsung.c
@@ -15,6 +15,7 @@
 #include <linux/platform_device.h>
 #include <linux/sched.h>
 #include <linux/slab.h>
+#include <linux/mm/high_memory.h>
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/onenand.h>
 #include <linux/mtd/partitions.h>
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 80fc7df2856a..1d7b4c781995 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -6,6 +6,7 @@
 #include <linux/mm/folio_size.h>
 #include <linux/mm/folio_usage.h>
 #include <linux/mm/folio_zone.h>
+#include <linux/mm/high_memory.h>
 #include <linux/mm/page_address.h>
 #include <linux/mm/page_section.h>
 #include <linux/mm/pfmemalloc.h>
@@ -82,7 +83,6 @@ static inline void totalram_pages_add(long count)
 	atomic_long_add(count, &_totalram_pages);
 }
 
-extern void * high_memory;
 extern int page_cluster;
 extern const int page_cluster_max;
 
diff --git a/include/linux/mm/high_memory.h b/include/linux/mm/high_memory.h
new file mode 100644
index 000000000000..e504aafd0d48
--- /dev/null
+++ b/include/linux/mm/high_memory.h
@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_MM_HIGH_MEMORY_H
+#define _LINUX_MM_HIGH_MEMORY_H
+
+extern void * high_memory;
+
+#endif /* _LINUX_MM_HIGH_MEMORY_H */
-- 
2.39.2