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--- ceph-12.1.1.orig/src/rocksdb/util/murmurhash.cc	2017-04-27 01:13:46.000000000 +0100
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+++ ceph-12.1.1.orig/src/rocksdb/util/murmurhash.cc	2017-07-25 11:37:28.910266684 +0100
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@@ -113,8 +113,8 @@ unsigned int MurmurHash2 ( const void *
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     switch(len)
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     {
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-    case 3: h ^= data[2] << 16;
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-    case 2: h ^= data[1] << 8;
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+    case 3: h ^= data[2] << 16; // fallthrough
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+    case 2: h ^= data[1] << 8; // fallthrough
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     case 1: h ^= data[0];
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         h *= m;
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     };