[PATCH v8 16/19] mm: move is_ioremap_addr() into new header file

[Baoquan He <bhe@redhat.com>]

Now is_ioremap_addr() is only used in kernel/iomem.c and gonna be used
in mm/ioremap.c. Move it into its own new header file linux/ioremap.h.

Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Baoquan He <bhe@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
v7->v8:
Fix conflict when rebasing to the latest linus's tree, it's caused by
commit ef104443bffa ("procfs: consolidate arch_report_meminfo declaration")
in file arch/powerpc/include/asm/pgtable.h.

 arch/powerpc/include/asm/pgtable.h | 10 ----------
 include/linux/ioremap.h            | 30 ++++++++++++++++++++++++++++++
 include/linux/mm.h                 |  5 -----
 kernel/iomem.c                     |  1 +
 mm/ioremap.c                       | 10 +---------
 5 files changed, 32 insertions(+), 24 deletions(-)
 create mode 100644 include/linux/ioremap.h

diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h
index 6a88bfdaa69b..445a22987aa3 100644
--- a/arch/powerpc/include/asm/pgtable.h
+++ b/arch/powerpc/include/asm/pgtable.h
@@ -157,16 +157,6 @@ static inline pgtable_t pmd_pgtable(pmd_t pmd)
 	return (pgtable_t)pmd_page_vaddr(pmd);
 }
 
-#ifdef CONFIG_PPC64
-#define is_ioremap_addr is_ioremap_addr
-static inline bool is_ioremap_addr(const void *x)
-{
-	unsigned long addr = (unsigned long)x;
-
-	return addr >= IOREMAP_BASE && addr < IOREMAP_END;
-}
-#endif /* CONFIG_PPC64 */
-
 #endif /* __ASSEMBLY__ */
 
 #endif /* _ASM_POWERPC_PGTABLE_H */
diff --git a/include/linux/ioremap.h b/include/linux/ioremap.h
new file mode 100644
index 000000000000..f0e99fc7dd8b
--- /dev/null
+++ b/include/linux/ioremap.h
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_IOREMAP_H
+#define _LINUX_IOREMAP_H
+
+#include <linux/kasan.h>
+#include <asm/pgtable.h>
+
+#if defined(CONFIG_HAS_IOMEM) || defined(CONFIG_GENERIC_IOREMAP)
+/*
+ * Ioremap often, but not always uses the generic vmalloc area. E.g on
+ * Power ARCH, it could have different ioremap space.
+ */
+#ifndef IOREMAP_START
+#define IOREMAP_START   VMALLOC_START
+#define IOREMAP_END     VMALLOC_END
+#endif
+static inline bool is_ioremap_addr(const void *x)
+{
+	unsigned long addr = (unsigned long)kasan_reset_tag(x);
+
+	return addr >= IOREMAP_START && addr < IOREMAP_END;
+}
+#else
+static inline bool is_ioremap_addr(const void *x)
+{
+	return false;
+}
+#endif
+
+#endif /* _LINUX_IOREMAP_H */
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 2dd73e4f3d8e..2bac9ec3527e 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1055,11 +1055,6 @@ unsigned long vmalloc_to_pfn(const void *addr);
  * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there
  * is no special casing required.
  */
-
-#ifndef is_ioremap_addr
-#define is_ioremap_addr(x) is_vmalloc_addr(x)
-#endif
-
 #ifdef CONFIG_MMU
 extern bool is_vmalloc_addr(const void *x);
 extern int is_vmalloc_or_module_addr(const void *x);
diff --git a/kernel/iomem.c b/kernel/iomem.c
index 62c92e43aa0d..9682471e6471 100644
--- a/kernel/iomem.c
+++ b/kernel/iomem.c
@@ -3,6 +3,7 @@
 #include <linux/types.h>
 #include <linux/io.h>
 #include <linux/mm.h>
+#include <linux/ioremap.h>
 
 #ifndef ioremap_cache
 /* temporary while we convert existing ioremap_cache users to memremap */
diff --git a/mm/ioremap.c b/mm/ioremap.c
index 68d9895144ad..a21a6c9fa5ab 100644
--- a/mm/ioremap.c
+++ b/mm/ioremap.c
@@ -10,15 +10,7 @@
 #include <linux/mm.h>
 #include <linux/io.h>
 #include <linux/export.h>
-
-/*
- * Ioremap often, but not always uses the generic vmalloc area. E.g on
- * Power ARCH, it could have different ioremap space.
- */
-#ifndef IOREMAP_START
-#define IOREMAP_START   VMALLOC_START
-#define IOREMAP_END     VMALLOC_END
-#endif
+#include <linux/ioremap.h>
 
 void __iomem *generic_ioremap_prot(phys_addr_t phys_addr, size_t size,
 				   pgprot_t prot)
-- 
2.34.1