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From:   Baoquan He <bhe@redhat.com>
To:     linux-kernel@vger.kernel.org
Cc:     linux-arch@vger.kernel.org, linux-mm@kvack.org, arnd@arndb.de,
        christophe.leroy@csgroup.eu, hch@lst.de, rppt@kernel.org,
        willy@infradead.org, agordeev@linux.ibm.com,
        wangkefeng.wang@huawei.com, schnelle@linux.ibm.com,
        David.Laight@ACULAB.COM, shorne@gmail.com, deller@gmx.de,
        Baoquan He <bhe@redhat.com>
Subject: [PATCH v6 16/19] mm: move is_ioremap_addr() into new header file
Date:   Fri,  9 Jun 2023 15:55:25 +0800
Message-Id: <20230609075528.9390-17-bhe@redhat.com>
In-Reply-To: <20230609075528.9390-1-bhe@redhat.com>
References: <20230609075528.9390-1-bhe@redhat.com>
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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>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Baoquan He <bhe@redhat.com>
---
v6:
  Newly added - Christoph

 arch/powerpc/include/asm/pgtable.h |  8 --------
 include/linux/ioremap.h            | 30 ++++++++++++++++++++++++++++++
 include/linux/mm.h                 |  5 -----
 kernel/iomem.c                     |  1 +
 mm/ioremap.c                       | 10 +---------
 5 files changed, 32 insertions(+), 22 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 9972626ddaf6..d252323a753f 100644
--- a/arch/powerpc/include/asm/pgtable.h
+++ b/arch/powerpc/include/asm/pgtable.h
@@ -158,14 +158,6 @@ static inline pgtable_t pmd_pgtable(pmd_t 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;
-}
-
 struct seq_file;
 void arch_report_meminfo(struct seq_file *m);
 #endif /* CONFIG_PPC64 */
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 27ce77080c79..7379f19768b4 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1041,11 +1041,6 @@ 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