[PATCH v5 03/12] mm: Reserve asm-generic prot flag 0x10 for arch use

Mark Brown
2020-01-22T21:21:35Z

The asm-generic mman definitions are used by a few architectures
that also define an arch-specific PROT flag with value 0x10. This
currently applies to sparc and powerpc, and arm64 will soon join
in.

To help future maintainers, document the use of this flag in the
asm-generic header too.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
include/uapi/asm-generic/mman-common.h | 1 +
1 file changed, 1 insertion(+)

diff --git a/include/uapi/asm-generic/mman-common.h b/include/uapi/asm-generic/mman-common.h
index c160a5354eb6..81442d2aaecb 100644
--- a/include/uapi/asm-generic/mman-common.h
+++ b/include/uapi/asm-generic/mman-common.h
@@ -11,6 +11,7 @@
#define PROT_WRITE 0x2 /* page can be written */
#define PROT_EXEC 0x4 /* page can be executed */
#define PROT_SEM 0x8 /* page may be used for atomic ops */
+ /* 0x10 reserved for arch-specific use */
#define PROT_NONE 0x0 /* page can not be accessed */
#define PROT_GROWSDOWN 0x01000000 /* mprotect flag: extend change to start of growsdown vma */
#define PROT_GROWSUP 0x02000000 /* mprotect flag: extend change to end of growsup vma */
--
2.20.1