From 0b985d2b11df9b34bbc8ebb300b2ec493d7dc5b8 Mon Sep 17 00:00:00 2001
From: Loic Dachary <ldachary@redhat.com>
Date: Tue, 25 Nov 2014 10:39:21 +0100
Subject: [PATCH] arch: fix neon feature detection

The fread function returns the number of elements read, not the number
of bytes.

Introduced by 1cef8339f7a2a503327c20c014e696c91d36281e , after giant.

Add tests for protection against similar regressions.

http://tracker.ceph.com/issues/10185 Fixes: #10185

Signed-off-by: Loic Dachary <ldachary@redhat.com>
---
 src/arch/neon.c       |  2 +-
 src/test/test_arch.cc | 88 +++++++++++++++++++++++++++++++++++++++----
 2 files changed, 81 insertions(+), 9 deletions(-)

diff --git a/src/arch/neon.c b/src/arch/neon.c
index 8baadedcc8d4b..6dad7e6e13eb9 100644
--- a/src/arch/neon.c
+++ b/src/arch/neon.c
@@ -22,7 +22,7 @@ static unsigned long get_auxval(unsigned long type)
 	if (f) {
 		ElfW(auxv_t) entry;
 		while ((read = fread(&entry, sizeof(entry), 1, f)) > 0) {
-			if (read != sizeof(entry))
+			if (read != 1)
 				break;
 			if (entry.a_type == type) {
 				result = entry.a_un.a_val;
diff --git a/src/test/test_arch.cc b/src/test/test_arch.cc
index 7b7ffe42f67e6..3b0cd8267f228 100644
--- a/src/test/test_arch.cc
+++ b/src/test/test_arch.cc
@@ -1,20 +1,92 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph distributed storage system
+ *
+ * Copyright (C) 2014 Red Hat <contact@redhat.com>
+ *
+ * Author: Loic Dachary <loic@dachary.org>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ */
 
 #include <stdio.h>
-#include <stdlib.h>
-#include <assert.h>
 
 #include "arch/probe.h"
 #include "arch/intel.h"
 #include "arch/neon.h"
+#include "global/global_init.h"
+#include "common/ceph_argparse.h"
+#include "global/global_context.h"
+#include "gtest/gtest.h"
+
+#define FLAGS_SIZE 4096
+
+TEST(Arch, all)
+{
+  ceph_arch_probe();
+  EXPECT_TRUE(ceph_arch_probed);
+  
+#if (__arm__ || __aarch64__ || __x86_64__) && __linux__
+  char flags[FLAGS_SIZE];
+  FILE *f = popen("grep '^\\(flags\\|Features\\)[	 ]*:' "
+                  "/proc/cpuinfo | head -1", "r");
+  if(f == NULL || fgets(flags, FLAGS_SIZE - 1, f) == NULL) {
+    // silently do nothing if /proc/cpuinfo does exist, is not
+    // readable or does not contain the expected information
+    if (f)
+      pclose(f);
+    return;
+  }
+  pclose(f);
+  flags[strlen(flags) - 1] = ' ';
+
+  int expected;
+
+  expected = strstr(flags, " neon ") ? 1 : 0;
+  EXPECT_EQ(expected, ceph_arch_neon);
+
+  expected = strstr(flags, " pclmulqdq ") ? 1 : 0;
+  EXPECT_EQ(expected, ceph_arch_intel_pclmul);
+
+  expected = strstr(flags, " sse4_2 ") ? 1 : 0;
+  EXPECT_EQ(expected, ceph_arch_intel_sse42);
+
+  expected = strstr(flags, " sse4_1 ") ? 1 : 0;
+  EXPECT_EQ(expected, ceph_arch_intel_sse41);
+
+  expected = (strstr(flags, " sse3 ") || strstr(flags, " ssse3 ")) ? 1 : 0;
+  EXPECT_EQ(expected, ceph_arch_intel_sse3);
+
+  expected = strstr(flags, " ssse3 ") ? 1 : 0;
+  EXPECT_EQ(expected, ceph_arch_intel_ssse3);
+
+  expected = strstr(flags, " sse2 ") ? 1 : 0;
+  EXPECT_EQ(expected, ceph_arch_intel_sse2);
+#endif
+}
 
 int main(int argc, char **argv)
 {
-	ceph_arch_probe();
-	assert(ceph_arch_probed);
+  vector<const char*> args;
+  argv_to_vec(argc, (const char **)argv, args);
 
-	printf("ceph_arch_intel_sse42 = %d\n", ceph_arch_intel_sse42);
-        printf("ceph_arch_intel_sse2 = %d\n", ceph_arch_intel_sse2);
-	printf("ceph_arch_neon = %d\n", ceph_arch_neon);
+  global_init(NULL, args, CEPH_ENTITY_TYPE_CLIENT, CODE_ENVIRONMENT_UTILITY, 0);
+  common_init_finish(g_ceph_context);
 
-	return 0;
+  ::testing::InitGoogleTest(&argc, argv);
+  return RUN_ALL_TESTS();
 }
+
+
+/*
+ * Local Variables:
+ * compile-command: "cd .. ; make -j4 &&
+ *   make unittest_arch &&
+ *   valgrind --tool=memcheck ./unittest_arch --gtest_filter=*.*"
+ * End:
+ */
-- 
2.39.5