1 files changed, 46 insertions, 0 deletions
diff --git a/include/linux/threads.h b/include/linux/threads.h
new file mode 100644
index 000000000..c34173e6c
--- /dev/null
+++ b/include/linux/threads.h
@@ -0,0 +1,46 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_THREADS_H
+#define _LINUX_THREADS_H
+
+
+/*
+ * The default limit for the nr of threads is now in
+ * /proc/sys/kernel/threads-max.
+ */
+
+/*
+ * Maximum supported processors.  Setting this smaller saves quite a
+ * bit of memory.  Use nr_cpu_ids instead of this except for static bitmaps.
+ */
+#ifndef CONFIG_NR_CPUS
+/* FIXME: This should be fixed in the arch's Kconfig */
+#define CONFIG_NR_CPUS	1
+#endif
+
+/* Places which use this should consider cpumask_var_t. */
+#define NR_CPUS		CONFIG_NR_CPUS
+
+#define MIN_THREADS_LEFT_FOR_ROOT 4
+
+/*
+ * This controls the default maximum pid allocated to a process
+ */
+#define PID_MAX_DEFAULT (CONFIG_BASE_SMALL ? 0x1000 : 0x8000)
+
+/*
+ * A maximum of 4 million PIDs should be enough for a while.
+ * [NOTE: PID/TIDs are limited to 2^30 ~= 1 billion, see FUTEX_TID_MASK.]
+ */
+#define PID_MAX_LIMIT (CONFIG_BASE_SMALL ? PAGE_SIZE * 8 : \
+	(sizeof(long) > 4 ? 4 * 1024 * 1024 : PID_MAX_DEFAULT))
+
+/*
+ * Define a minimum number of pids per cpu.  Heuristically based
+ * on original pid max of 32k for 32 cpus.  Also, increase the
+ * minimum settable value for pid_max on the running system based
+ * on similar defaults.  See kernel/pid.c:pid_idr_init() for details.
+ */
+#define PIDS_PER_CPU_DEFAULT	1024
+#define PIDS_PER_CPU_MIN	8
+
+#endif