mm: move is_ioremap_addr() into new header file

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.

Link: https://lkml.kernel.org/r/[e-mail]
Suggested-by: Christoph Hellwig <[e-mail]>
Signed-off-by: Baoquan He <[e-mail]>
Reviewed-by: Christoph Hellwig <[e-mail]>
Cc: Alexander Gordeev <[e-mail]>
Cc: Arnd Bergmann <[e-mail]>
Cc: Brian Cain <[e-mail]>
Cc: Catalin Marinas <[e-mail]>
Cc: Christian Borntraeger <[e-mail]>
Cc: Christophe Leroy <[e-mail]>
Cc: Chris Zankel <[e-mail]>
Cc: David Laight <[e-mail]>
Cc: Geert Uytterhoeven <[e-mail]>
Cc: Gerald Schaefer <[e-mail]>
Cc: Heiko Carstens <[e-mail]>
Cc: Helge Deller <[e-mail]>
Cc: "James E.J. Bottomley" <[e-mail]>
Cc: John Paul Adrian Glaubitz <[e-mail]>
Cc: Jonas Bonn <[e-mail]>
Cc: Kefeng Wang <[e-mail]>
Cc: Matthew Wilcox <[e-mail]>
Cc: Max Filippov <[e-mail]>
Cc: Michael Ellerman <[e-mail]>
Cc: Mike Rapoport (IBM) <[e-mail]>
Cc: Nathan Chancellor <[e-mail]>
Cc: Nicholas Piggin <[e-mail]>
Cc: Niklas Schnelle <[e-mail]>
Cc: Rich Felker <[e-mail]>
Cc: Stafford Horne <[e-mail]>
Cc: Stefan Kristiansson <[e-mail]>
Cc: Sven Schnelle <[e-mail]>
Cc: Vasily Gorbik <[e-mail]>
Cc: Vineet Gupta <[e-mail]>
Cc: Will Deacon <[e-mail]>
Cc: Yoshinori Sato <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

arch/powerpc/include/asm/pgtable.h

···
 	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 */

include/linux/ioremap.h

···
+/* 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 */

include/linux/mm.h

···
  * 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);

kernel/iomem.c

···
 #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 */

mm/ioremap.c

···
 #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)