Detach sched.h from mm.h

First thing mm.h does is including sched.h solely for can_do_mlock() inline
function which has "current" dereference inside. By dealing with can_do_mlock()
mm.h can be detached from sched.h which is good. See below, why.

This patch
a) removes unconditional inclusion of sched.h from mm.h
b) makes can_do_mlock() normal function in mm/mlock.c
c) exports can_do_mlock() to not break compilation
d) adds sched.h inclusions back to files that were getting it indirectly.
e) adds less bloated headers to some files (asm/signal.h, jiffies.h) that were
   getting them indirectly

Net result is:
a) mm.h users would get less code to open, read, preprocess, parse, ... if
   they don't need sched.h
b) sched.h stops being dependency for significant number of files:
   on x86_64 allmodconfig touching sched.h results in recompile of 4083 files,
   after patch it's only 3744 (-8.3%).

Cross-compile tested on

	all arm defconfigs, all mips defconfigs, all powerpc defconfigs,
	alpha alpha-up
	arm
	i386 i386-up i386-defconfig i386-allnoconfig
	ia64 ia64-up
	m68k
	mips
	parisc parisc-up
	powerpc powerpc-up
	s390 s390-up
	sparc sparc-up
	sparc64 sparc64-up
	um-x86_64
	x86_64 x86_64-up x86_64-defconfig x86_64-allnoconfig

as well as my two usual configs.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

12 files changed, 12 insertions, 0 deletions

diff --git a/fs/afs/callback.c b/fs/afs/callback.c
index f64e40f..bacf518 100644
--- a/fs/afs/callback.c
+++ b/fs/afs/callback.c
@@ -17,6 +17,7 @@
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/circ_buf.h>
+#include <linux/sched.h>
 #include "internal.h"
 
 unsigned afs_vnode_update_timeout = 10;
diff --git a/fs/afs/cell.c b/fs/afs/cell.c
index 9b1311a..175a567 100644
--- a/fs/afs/cell.c
+++ b/fs/afs/cell.c
@@ -13,6 +13,7 @@
 #include <linux/slab.h>
 #include <linux/key.h>
 #include <linux/ctype.h>
+#include <linux/sched.h>
 #include <keys/rxrpc-type.h>
 #include "internal.h"
 
diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index 719af4f..546c595 100644
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -16,6 +16,7 @@
 #include <linux/fs.h>
 #include <linux/pagemap.h>
 #include <linux/ctype.h>
+#include <linux/sched.h>
 #include "internal.h"
 
 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index 47f5fed..d196840 100644
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
@@ -19,6 +19,7 @@
 #include <linux/slab.h>
 #include <linux/fs.h>
 #include <linux/pagemap.h>
+#include <linux/sched.h>
 #include "internal.h"
 
 struct afs_iget_data {
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 4953ba5..2dac3ad 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -16,6 +16,7 @@
 #include <linux/skbuff.h>
 #include <linux/rxrpc.h>
 #include <linux/key.h>
+#include <linux/workqueue.h>
 #include "afs.h"
 #include "afs_vl.h"
 
diff --git a/fs/afs/main.c b/fs/afs/main.c
index f1f71ff..cd21195 100644
--- a/fs/afs/main.c
+++ b/fs/afs/main.c
@@ -13,6 +13,7 @@
 #include <linux/moduleparam.h>
 #include <linux/init.h>
 #include <linux/completion.h>
+#include <linux/sched.h>
 #include "internal.h"
 
 MODULE_DESCRIPTION("AFS Client File System");
diff --git a/fs/afs/proc.c b/fs/afs/proc.c
index d5601f6..13df512 100644
--- a/fs/afs/proc.c
+++ b/fs/afs/proc.c
@@ -13,6 +13,7 @@
 #include <linux/module.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
+#include <linux/sched.h>
 #include <asm/uaccess.h>
 #include "internal.h"
 
diff --git a/fs/afs/security.c b/fs/afs/security.c
index e0ea88b..566fe71 100644
--- a/fs/afs/security.c
+++ b/fs/afs/security.c
@@ -13,6 +13,7 @@
 #include <linux/slab.h>
 #include <linux/fs.h>
 #include <linux/ctype.h>
+#include <linux/sched.h>
 #include <keys/rxrpc-type.h>
 #include "internal.h"
 
diff --git a/fs/afs/super.c b/fs/afs/super.c
index 8d47ad8..2e8496b 100644
--- a/fs/afs/super.c
+++ b/fs/afs/super.c
@@ -22,6 +22,7 @@
 #include <linux/pagemap.h>
 #include <linux/parser.h>
 #include <linux/statfs.h>
+#include <linux/sched.h>
 #include "internal.h"
 
 #define AFS_FS_MAGIC 0x6B414653 /* 'kAFS' */
diff --git a/fs/afs/vlocation.c b/fs/afs/vlocation.c
index 3370cdb..09e3ad0 100644
--- a/fs/afs/vlocation.c
+++ b/fs/afs/vlocation.c
@@ -12,6 +12,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
+#include <linux/sched.h>
 #include "internal.h"
 
 unsigned afs_vlocation_timeout = 10;	/* volume location timeout in seconds */
diff --git a/fs/afs/vnode.c b/fs/afs/vnode.c
index c36c98c..232c55d 100644
--- a/fs/afs/vnode.c
+++ b/fs/afs/vnode.c
@@ -14,6 +14,7 @@
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/fs.h>
+#include <linux/sched.h>
 #include "internal.h"
 
 #if 0
diff --git a/fs/afs/volume.c b/fs/afs/volume.c
index dd160ca..8bab0e3 100644
--- a/fs/afs/volume.c
+++ b/fs/afs/volume.c
@@ -15,6 +15,7 @@
 #include <linux/slab.h>
 #include <linux/fs.h>
 #include <linux/pagemap.h>
+#include <linux/sched.h>
 #include "internal.h"
 
 static const char *afs_voltypes[] = { "R/W", "R/O", "BAK" };