// $Header$
// Kernel Version:
//  VERSION = 2
//  PATCHLEVEL = 5
//  SUBLEVEL = 48
//  EXTRAVERSION =
--- 2.5/fs/select.c	2002-11-20 19:08:58.000000000 +0100
+++ build-2.5/fs/select.c	2002-11-20 19:00:11.000000000 +0100
@@ -62,6 +62,7 @@
  * - the poll table contains 6 wait queue entries. This means that no dynamic
  *   memory allocation is necessary for the wait queues if one of the first
  *   6 file descriptors has new data.
+ * - sys_select saves 192 bytes on the stack, enough for 256 file descriptors.
  * <manfred@colorfullife.com>
  */
 
@@ -261,14 +262,18 @@
 	return retval;
 }
 
-static void *select_bits_alloc(int size)
+#define SELECT_INLINE_BYTES	32
+static inline void *select_bits_alloc(int size, void *internal)
 {
+	if(size <= SELECT_INLINE_BYTES)
+		return internal;
 	return kmalloc(6 * size, GFP_KERNEL);
 }
 
-static void select_bits_free(void *bits, int size)
+static inline void select_bits_free(void *bits, void *internal)
 {
-	kfree(bits);
+	if(bits != internal)
+		kfree(bits);
 }
 
 /*
@@ -286,6 +291,7 @@
 sys_select(int n, fd_set *inp, fd_set *outp, fd_set *exp, struct timeval *tvp)
 {
 	fd_set_bits fds;
+	char ibuf[6*SELECT_INLINE_BYTES];
 	char *bits;
 	long timeout;
 	int ret, size, max_fdset;
@@ -325,7 +331,7 @@
 	 */
 	ret = -ENOMEM;
 	size = FDS_BYTES(n);
-	bits = select_bits_alloc(size);
+	bits = select_bits_alloc(size, ibuf);
 	if (!bits)
 		goto out_nofds;
 	fds.in      = (unsigned long *)  bits;
@@ -370,7 +376,7 @@
 	set_fd_set(n, exp, fds.res_ex);
 
 out:
-	select_bits_free(bits, size);
+	select_bits_free(bits, ibuf);
 out_nofds:
 	return ret;
 }