Revert "[scudo] Make getNumberOfCPUs Fuchsia compliant"

This reverts commit r317604.

Android doesn't have cpu_set_t.

llvm-svn: 317655

compiler-rt/lib/sanitizer_common/sanitizer_common.h

@@ -933,9 +933,6 @@ void CheckNoDeepBind(const char *filename, int flag);
 // be used to seed a PRNG. Defaults to blocking like the underlying syscall.
 bool GetRandom(void *buffer, uptr length, bool blocking = true);
 
-// Returns the number of logical processors on the system.
-u32 GetNumberOfCPUs();
-
 }  // namespace __sanitizer
 
 inline void *operator new(__sanitizer::operator_new_size_type size,

compiler-rt/lib/sanitizer_common/sanitizer_fuchsia.cc

@@ -520,10 +520,6 @@ bool GetRandom(void *buffer, uptr length, bool blocking) {
   return true;
 }
 
-u32 GetNumberOfCPUs() {
-  return zx_system_get_num_cpus();
-}
-
 }  // namespace __sanitizer
 
 using namespace __sanitizer;  // NOLINT

compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cc

@@ -37,14 +37,9 @@
 #if SANITIZER_FREEBSD
 #include <pthread_np.h>
 #include <osreldate.h>
-#include <sys/sysctl.h>
 #define pthread_getattr_np pthread_attr_get_np
 #endif
 
-#if SANITIZER_NETBSD
-#include <sys/sysctl.h>
-#endif
-
 #if SANITIZER_LINUX
 #include <sys/prctl.h>
 #endif
@@ -543,23 +538,6 @@ uptr GetRSS() {
   return rss * GetPageSizeCached();
 }
 
-// sysconf(_SC_NPROCESSORS_{CONF,ONLN}) cannot be used as they allocate memory.
-u32 GetNumberOfCPUs() {
-#if SANITIZER_FREEBSD || SANITIZER_NETBSD
-  u32 ncpu;
-  int req[2];
-  size_t len = sizeof(ncpu);
-  req[0] = CTL_HW;
-  req[1] = HW_NCPU;
-  CHECK_EQ(sysctl(req, 2, &ncpu, &len, NULL, 0), 0);
-  return ncpu;
-#else
-  cpu_set_t CPUs;
-  CHECK_EQ(sched_getaffinity(0, sizeof(cpu_set_t), &CPUs), 0);
-  return CPU_COUNT(&CPUs);
-#endif
-}
-
 // 64-bit Android targets don't provide the deprecated __android_log_write.
 // Starting with the L release, syslog() works and is preferable to
 // __android_log_write.

compiler-rt/lib/sanitizer_common/sanitizer_mac.cc

@@ -1000,11 +1000,6 @@ bool GetRandom(void *buffer, uptr length, bool blocking) {
   UNIMPLEMENTED();
 }
 
-// FIXME: implement on this platform.
-u32 GetNumberOfCPUs() {
-  UNIMPLEMENTED();
-}
-
 }  // namespace __sanitizer
 
 #endif  // SANITIZER_MAC

compiler-rt/lib/sanitizer_common/sanitizer_win.cc

@@ -1093,11 +1093,6 @@ bool GetRandom(void *buffer, uptr length, bool blocking) {
   UNIMPLEMENTED();
 }
 
-// FIXME: implement on this platform.
-u32 GetNumberOfCPUs() {
-  UNIMPLEMENTED();
-}
-
 }  // namespace __sanitizer
 
 #endif  // _WIN32

compiler-rt/lib/scudo/scudo_tsd_shared.cpp

@@ -24,10 +24,17 @@ static atomic_uint32_t CurrentIndex;
 static ScudoTSD *TSDs;
 static u32 NumberOfTSDs;
 
+// sysconf(_SC_NPROCESSORS_{CONF,ONLN}) cannot be used as they allocate memory.
+static u32 getNumberOfCPUs() {
+  cpu_set_t CPUs;
+  CHECK_EQ(sched_getaffinity(0, sizeof(cpu_set_t), &CPUs), 0);
+  return CPU_COUNT(&CPUs);
+}
+
 static void initOnce() {
   CHECK_EQ(pthread_key_create(&PThreadKey, NULL), 0);
   initScudo();
-  NumberOfTSDs = Min(Max(1U, GetNumberOfCPUs()),
+  NumberOfTSDs = Min(Max(1U, getNumberOfCPUs()),
                      static_cast<u32>(SCUDO_SHARED_TSD_POOL_SIZE));
   TSDs = reinterpret_cast<ScudoTSD *>(
       MmapOrDie(sizeof(ScudoTSD) * NumberOfTSDs, "ScudoTSDs"));