[PATCH] base-small: shrink PID tables

CONFIG_BASE_SMALL reduce size of pidmap table for small machines
Signed-off-by: Matt Mackall <mpm@selenic.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/linux/threads.h

@@ -7,7 +7,7 @@
  * The default limit for the nr of threads is now in
  * /proc/sys/kernel/threads-max.
  */
- 
+
 /*
  * Maximum supported processors that can run under SMP.  This value is
  * set via configure setting.  The maximum is equal to the size of the
@@ -25,11 +25,12 @@
 /*
  * This controls the default maximum pid allocated to a process
  */
-#define PID_MAX_DEFAULT 0x8000
+#define PID_MAX_DEFAULT (CONFIG_BASE_SMALL ? 0x1000 : 0x8000)
 
 /*
  * A maximum of 4 million PIDs should be enough for a while:
  */
-#define PID_MAX_LIMIT (sizeof(long) > 4 ? 4*1024*1024 : PID_MAX_DEFAULT)
+#define PID_MAX_LIMIT (CONFIG_BASE_SMALL ? PAGE_SIZE * 8 : \
+	(sizeof(long) > 4 ? 4 * 1024 * 1024 : PID_MAX_DEFAULT))
 
 #endif