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-rw-r--r--include/linux/ioremap.h30
1 files changed, 30 insertions, 0 deletions
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 */