linux: fix accuracy of get_nprocs and get_nprocs_conf [BZ #28865]

get_nprocs() and get_nprocs_conf() use various methods to obtain an
accurate number of processors.  Re-introduce __get_nprocs_sched() as
a source of information, and fix the order in which these methods are
used to return the most accurate information.  The primary source of
information used in both functions remains unchanged.

This also changes __get_nprocs_sched() error return value from 2 to 0,
but all its users are already prepared to handle that.

Old fallback order:
  get_nprocs:
    /sys/devices/system/cpu/online -> /proc/stat -> 2
  get_nprocs_conf:
    /sys/devices/system/cpu/ -> /proc/stat -> 2

New fallback order:
  get_nprocs:
    /sys/devices/system/cpu/online -> /proc/stat -> sched_getaffinity -> 2
  get_nprocs_conf:
    /sys/devices/system/cpu/ -> /proc/stat -> sched_getaffinity -> 2

Fixes: 342298278e ("linux: Revert the use of sched_getaffinity on get_nproc")
Closes: BZ #28865
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

sysdeps/unix/sysv/linux/getsysstats.c

@@ -50,9 +50,8 @@ __get_nprocs_sched (void)
        is an arbitrary values assuming such systems should be rare and there
        is no offline cpus.  */
     return max_num_cpus;
-  /* Some other error.  2 is conservative (not a uniprocessor system, so
-     atomics are needed). */
-  return 2;
+  /* Some other error.  */
+  return 0;
 }
 
 static char *
@@ -108,22 +107,19 @@ next_line (int fd, char *const buffer, char **cp, char **re,
 }
 
 static int
-get_nproc_stat (char *buffer, size_t buffer_size)
+get_nproc_stat (void)
 {
+  enum { buffer_size = 1024 };
+  char buffer[buffer_size];
   char *buffer_end = buffer + buffer_size;
   char *cp = buffer_end;
   char *re = buffer_end;
-
-  /* Default to an SMP system in case we cannot obtain an accurate
-     number.  */
-  int result = 2;
+  int result = 0;
 
   const int flags = O_RDONLY | O_CLOEXEC;
   int fd = __open_nocancel ("/proc/stat", flags);
   if (fd != -1)
     {
-      result = 0;
-
       char *l;
       while ((l = next_line (fd, buffer, &cp, &re, buffer_end)) != NULL)
 	/* The current format of /proc/stat has all the cpu* entries
@@ -139,8 +135,8 @@ get_nproc_stat (char *buffer, size_t buffer_size)
   return result;
 }
 
-int
-__get_nprocs (void)
+static int
+get_nprocs_cpu_online (void)
 {
   enum { buffer_size = 1024 };
   char buffer[buffer_size];
@@ -179,7 +175,8 @@ __get_nprocs (void)
 		  }
 	      }
 
-	    result += m - n + 1;
+	    if (m >= n)
+	      result += m - n + 1;
 
 	    l = endp;
 	    if (l < re && *l == ',')
@@ -188,28 +185,18 @@ __get_nprocs (void)
 	while (l < re && *l != '\n');
 
       __close_nocancel_nostatus (fd);
-
-      if (result > 0)
-	return result;
     }
 
-  return get_nproc_stat (buffer, buffer_size);
+  return result;
 }
-libc_hidden_def (__get_nprocs)
-weak_alias (__get_nprocs, get_nprocs)
 
-
-/* On some architectures it is possible to distinguish between configured
-   and active cpus.  */
-int
-__get_nprocs_conf (void)
+static int
+get_nprocs_cpu (void)
 {
-  /* Try to use the sysfs filesystem.  It has actual information about
-     online processors.  */
+  int count = 0;
   DIR *dir = __opendir ("/sys/devices/system/cpu");
   if (dir != NULL)
     {
-      int count = 0;
       struct dirent64 *d;
 
       while ((d = __readdir64 (dir)) != NULL)
@@ -224,12 +211,57 @@ __get_nprocs_conf (void)
 
       __closedir (dir);
 
-      return count;
     }
+  return count;
+}
 
-  enum { buffer_size = 1024 };
-  char buffer[buffer_size];
-  return get_nproc_stat (buffer, buffer_size);
+static int
+get_nprocs_fallback (void)
+{
+  int result;
+
+  /* Try /proc/stat first.  */
+  result = get_nproc_stat ();
+  if (result != 0)
+    return result;
+
+  /* Try sched_getaffinity.  */
+  result = __get_nprocs_sched ();
+  if (result != 0)
+    return result;
+
+  /* We failed to obtain an accurate number.  Be conservative: return
+     the smallest number meaning that this is not a uniprocessor system,
+     so atomics are needed.  */
+  return 2;
+}
+
+int
+__get_nprocs (void)
+{
+  /* Try /sys/devices/system/cpu/online first.  */
+  int result = get_nprocs_cpu_online ();
+  if (result != 0)
+    return result;
+
+  /* Fall back to /proc/stat and sched_getaffinity.  */
+  return get_nprocs_fallback ();
+}
+libc_hidden_def (__get_nprocs)
+weak_alias (__get_nprocs, get_nprocs)
+
+/* On some architectures it is possible to distinguish between configured
+   and active cpus.  */
+int
+__get_nprocs_conf (void)
+{
+  /* Try /sys/devices/system/cpu/ first.  */
+  int result = get_nprocs_cpu ();
+  if (result != 0)
+    return result;
+
+  /* Fall back to /proc/stat and sched_getaffinity.  */
+  return get_nprocs_fallback ();
 }
 libc_hidden_def (__get_nprocs_conf)
 weak_alias (__get_nprocs_conf, get_nprocs_conf)