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-rw-r--r--llvm/tools/llvm-exegesis/lib/BenchmarkRunner.cpp7
1 files changed, 7 insertions, 0 deletions
diff --git a/llvm/tools/llvm-exegesis/lib/BenchmarkRunner.cpp b/llvm/tools/llvm-exegesis/lib/BenchmarkRunner.cpp
index d1b0a58..8e242cd 100644
--- a/llvm/tools/llvm-exegesis/lib/BenchmarkRunner.cpp
+++ b/llvm/tools/llvm-exegesis/lib/BenchmarkRunner.cpp
@@ -44,7 +44,14 @@
#define GLIBC_INITS_RSEQ
#endif
#endif
+
+// Before kernel 4.17, Linux did not support MAP_FIXED_NOREPLACE, so if it is
+// not available, simplfy define it as MAP_FIXED which performs the same
+// function but does not guarantee existing mappings won't get clobbered.
+#ifndef MAP_FIXED_NOREPLACE
+#define MAP_FIXED_NOREPLACE MAP_FIXED
#endif
+#endif // __linux__
namespace llvm {
namespace exegesis {