[PATCH v4 05/24] arm64:ilp32: expose 'kernel_long' as 'long long' for ILP32

From: Philipp Tomsich
Date: Mon Apr 13 2015 - 16:18:04 EST

From: Andrew Pinski <apinski@xxxxxxxxxx>

Since we want time_t and some other userland types to be the same
between ILP32 and LP64, we define __kernel_long_t to be long long.

To reuse the bulk of LP64 system calls (and data structures), the LP64
kernel data types ('kernel_long', 'kernel_ulong') are exposed as their
ILP32 'long long' and 'unsigned long long' equivalents to allow glibc
to correctly interpret most data-structures used in the kernel ABI
(i.el with the exception of those, that include pointers).

Signed-off-by: Philipp Tomsich <philipp.tomsich@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Christoph Muellner <christoph.muellner@xxxxxxxxxxxxxxxxxxxxx>
arch/arm64/include/uapi/asm/posix_types.h | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/uapi/asm/posix_types.h b/arch/arm64/include/uapi/asm/posix_types.h
index 7985ff6..d6a7cb5 100644
--- a/arch/arm64/include/uapi/asm/posix_types.h
+++ b/arch/arm64/include/uapi/asm/posix_types.h
@@ -5,6 +5,16 @@ typedef unsigned short __kernel_old_uid_t;
typedef unsigned short __kernel_old_gid_t;
#define __kernel_old_uid_t __kernel_old_uid_t

+#if defined(__ILP32__)
+/* The ILP32 kernel ABI reuses LP64 system calls where possible; to
+ this end, the equivalent ILP32 type definitions are used (a 64bit
+ 'long'-type in LP64 corresponds to a 'long long' in LP64). */
+typedef long long __kernel_long_t;
+typedef unsigned long long __kernel_ulong_t;
+#define __kernel_long_t __kernel_long_t
+#endif /* defined(__ILP32__) */
#include <asm-generic/posix_types.h>

-#endif /* __ASM_POSIX_TYPES_H */
+#endif /* __ASM_POSIX_TYPES_H */

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