include/linux/ioremap.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_IOREMAP_H
   3 #define _LINUX_IOREMAP_H
   4
   5 #include <linux/kasan.h>
   6 #include <asm/pgtable.h>
   7 #include <asm/vmalloc.h>
   8
   9 #if defined(CONFIG_HAS_IOMEM) || defined(CONFIG_GENERIC_IOREMAP)
  10 /*
  11  * Ioremap often, but not always uses the generic vmalloc area. E.g on
  12  * Power ARCH, it could have different ioremap space.
  13  */
  14 #ifndef IOREMAP_START
  15 #define IOREMAP_START   VMALLOC_START
  16 #define IOREMAP_END     VMALLOC_END
  17 #endif
  18 static inline bool is_ioremap_addr(const void *x)
  19 {
  20         unsigned long addr = (unsigned long)kasan_reset_tag(x);
  21
  22         return addr >= IOREMAP_START && addr < IOREMAP_END;
  23 }
  24 #else
  25 static inline bool is_ioremap_addr(const void *x)
  26 {
  27         return false;
  28 }
  29 #endif
  30
  31 #endif /* _LINUX_IOREMAP_H */