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[RFC,2/4] asm-generic/io.h: Add IO_SPACE_BASE

Message ID 1610729929-188490-3-git-send-email-john.garry@huawei.com
State New
Headers show
Series Fix arm64 crash for accessing unmapped IO port regions (reboot) | expand

Commit Message

John Garry Jan. 15, 2021, 4:58 p.m. UTC
Add a fallback default for IO_SPACE_BASE (at 0) for when an architecture
does not define a value.

Signed-off-by: John Garry <john.garry@huawei.com>
 include/asm-generic/io.h | 4 ++++
 1 file changed, 4 insertions(+)
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diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
index 9ea83d80eb6f..4d74a0c696ca 100644
--- a/include/asm-generic/io.h
+++ b/include/asm-generic/io.h
@@ -448,6 +448,10 @@  static inline void writesq(volatile void __iomem *addr, const void *buffer,
 #define IO_SPACE_LIMIT 0xffff
+#ifndef IO_SPACE_BASE
+#define IO_SPACE_BASE 0x0
  * {in,out}{b,w,l}() access little endian I/O. {in,out}{b,w,l}_p() can be
  * implemented on hardware that needs an additional delay for I/O accesses to