[PATCH] cifs experimental off leads to compile errors

[Andy Whitcroft]

As of 2.6.17-rc2-git5 it seems that CIFS has stopped working
if CIFS_EXPERIMENTAL isn't enabled .  The following sorts
out the errors, but I am not sure if the semantics of the
experimEnabled_write() are correct when CIFS_EXPERIMENTAL is
disabled.

-apw

=== 8< ===
cifs experimental off leads to compile errors

When compiling with CIFS enabled but with CIFS_EXPERIMENTAL disabled
you get link errors as below.

  fs/built-in.o(.text+0x11bf8c): In function `.cifs_setup_session':
  : undefined reference to `.CIFS_SessSetup'

It seems that we need to help the optimiser out more when disabling
this code.  This patch turns the experimEnabled variable into the
constant (0) when experimental support is not compiled in.

Signed-off-by: Andy Whitcroft <apw at shadowen.org>
---
diff -upN reference/fs/cifs/cifs_debug.c current/fs/cifs/cifs_debug.c
--- reference/fs/cifs/cifs_debug.c
+++ current/fs/cifs/cifs_debug.c
@@ -616,6 +616,7 @@ experimEnabled_write(struct file *file, 
 	rc = get_user(c, buffer);
 	if (rc)
 		return rc;
+#ifdef CONFIG_CIFS_EXPERIMENTAL
 	if (c == '0' || c == 'n' || c == 'N')
 		experimEnabled = 0;
 	else if (c == '1' || c == 'y' || c == 'Y')
@@ -624,6 +625,9 @@ experimEnabled_write(struct file *file, 
 		experimEnabled = 2;
 
 	return count;
+#else
+	return -ENOSYS;
+#endif
 }
 
 static int
diff -upN reference/fs/cifs/cifsfs.c current/fs/cifs/cifsfs.c
--- reference/fs/cifs/cifsfs.c
+++ current/fs/cifs/cifsfs.c
@@ -52,7 +52,9 @@ int cifsFYI = 0;
 int cifsERROR = 1;
 int traceSMB = 0;
 unsigned int oplockEnabled = 1;
+#ifdef CONFIG_CIFS_EXPERIMENTAL
 unsigned int experimEnabled = 0;
+#endif
 unsigned int linuxExtEnabled = 1;
 unsigned int lookupCacheEnabled = 1;
 unsigned int multiuser_mount = 0;
diff -upN reference/fs/cifs/cifsglob.h current/fs/cifs/cifsglob.h
--- reference/fs/cifs/cifsglob.h
+++ current/fs/cifs/cifsglob.h
@@ -536,7 +536,11 @@ GLOBAL_EXTERN unsigned int multiuser_mou
 				have the uid/password or Kerberos credential 
 				or equivalent for current user */
 GLOBAL_EXTERN unsigned int oplockEnabled;
+#ifdef CONFIG_CIFS_EXPERIMENTAL
 GLOBAL_EXTERN unsigned int experimEnabled;
+#else
+#define experimEnabled (0)
+#endif
 GLOBAL_EXTERN unsigned int lookupCacheEnabled;
 GLOBAL_EXTERN unsigned int extended_security;	/* if on, session setup sent 
 				with more secure ntlmssp2 challenge/resp */