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diff -Naur acpica-unix2-20160831/source/include/platform/aclinux.h acpica-unix2-20160831-s390x/source/include/platform/aclinux.h
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--- acpica-unix2-20160831/source/include/platform/aclinux.h	2016-09-01 15:18:36.306268594 -0600
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+++ acpica-unix2-20160831-s390x/source/include/platform/aclinux.h	2016-09-01 16:01:34.955157827 -0600
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@@ -194,7 +194,8 @@
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 #define ACPI_CAST_PTHREAD_T(Pthread) ((ACPI_THREAD_ID) (Pthread))
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 #if defined(__ia64__)    || defined(__x86_64__) ||\
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-    defined(__aarch64__) || defined(__PPC64__)
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+    defined(__aarch64__) || defined(__PPC64__)  ||\
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+    defined(__s390x__)
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 #define ACPI_MACHINE_WIDTH          64
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 #define COMPILER_DEPENDENT_INT64    long
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 #define COMPILER_DEPENDENT_UINT64   unsigned long