include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files.  percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.

percpu.h -> slab.h dependency is about to be removed.  Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability.  As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.

  http://userweb.kernel.org/~tj/misc/slabh-sweep.py

The script does the followings.

* Scan files for gfp and slab usages and update includes such that
  only the necessary includes are there.  ie. if only gfp is used,
  gfp.h, if slab is used, slab.h.

* When the script inserts a new include, it looks at the include
  blocks and try to put the new include such that its order conforms
  to its surrounding.  It's put in the include block which contains
  core kernel includes, in the same order that the rest are ordered -
  alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
  doesn't seem to be any matching order.

* If the script can't find a place to put a new include (mostly
  because the file doesn't have fitting include block), it prints out
  an error message indicating which .h file needs to be added to the
  file.

The conversion was done in the following steps.

1. The initial automatic conversion of all .c files updated slightly
   over 4000 files, deleting around 700 includes and adding ~480 gfp.h
   and ~3000 slab.h inclusions.  The script emitted errors for ~400
   files.

2. Each error was manually checked.  Some didn't need the inclusion,
   some needed manual addition while adding it to implementation .h or
   embedding .c file was more appropriate for others.  This step added
   inclusions to around 150 files.

3. The script was run again and the output was compared to the edits
   from #2 to make sure no file was left behind.

4. Several build tests were done and a couple of problems were fixed.
   e.g. lib/decompress_*.c used malloc/free() wrappers around slab
   APIs requiring slab.h to be added manually.

5. The script was run on all .h files but without automatically
   editing them as sprinkling gfp.h and slab.h inclusions around .h
   files could easily lead to inclusion dependency hell.  Most gfp.h
   inclusion directives were ignored as stuff from gfp.h was usually
   wildly available and often used in preprocessor macros.  Each
   slab.h inclusion directive was examined and added manually as
   necessary.

6. percpu.h was updated not to include slab.h.

7. Build test were done on the following configurations and failures
   were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my
   distributed build env didn't work with gcov compiles) and a few
   more options had to be turned off depending on archs to make things
   build (like ipr on powerpc/64 which failed due to missing writeq).

   * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
   * powerpc and powerpc64 SMP allmodconfig
   * sparc and sparc64 SMP allmodconfig
   * ia64 SMP allmodconfig
   * s390 SMP allmodconfig
   * alpha SMP allmodconfig
   * um on x86_64 SMP allmodconfig

8. percpu.h modifications were reverted so that it could be applied as
   a separate patch and serve as bisection point.

Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.

Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>

14 files changed, 12 insertions, 2 deletions

diff --git a/lib/cpumask.c b/lib/cpumask.c
index 7bb4142a502f..05d6aca7fc19 100644
--- a/lib/cpumask.c
+++ b/lib/cpumask.c
@@ -1,3 +1,4 @@
+#include <linux/slab.h>
 #include <linux/kernel.h>
 #include <linux/bitops.h>
 #include <linux/cpumask.h>
diff --git a/lib/crc32.c b/lib/crc32.c
index 0f45fbff34cb..bc5b936e9142 100644
--- a/lib/crc32.c
+++ b/lib/crc32.c
@@ -25,7 +25,6 @@
 #include <linux/module.h>
 #include <linux/compiler.h>
 #include <linux/types.h>
-#include <linux/slab.h>
 #include <linux/init.h>
 #include <asm/atomic.h>
 #include "crc32defs.h"
diff --git a/lib/debugobjects.c b/lib/debugobjects.c
index a9a8996d286a..b862b30369ff 100644
--- a/lib/debugobjects.c
+++ b/lib/debugobjects.c
@@ -12,6 +12,7 @@
 #include <linux/sched.h>
 #include <linux/seq_file.h>
 #include <linux/debugfs.h>
+#include <linux/slab.h>
 #include <linux/hash.h>
 
 #define ODEBUG_HASH_BITS	14
diff --git a/lib/devres.c b/lib/devres.c
index 72c8909006da..49368608f988 100644
--- a/lib/devres.c
+++ b/lib/devres.c
@@ -1,5 +1,6 @@
 #include <linux/pci.h>
 #include <linux/io.h>
+#include <linux/gfp.h>
 #include <linux/module.h>
 
 void devm_ioremap_release(struct device *dev, void *res)
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index f93502915988..d6b8b9b1abfe 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -25,6 +25,7 @@
 #include <linux/uaccess.h>
 #include <linux/dynamic_debug.h>
 #include <linux/debugfs.h>
+#include <linux/slab.h>
 
 extern struct _ddebug __start___verbose[];
 extern struct _ddebug __stop___verbose[];
diff --git a/lib/genalloc.c b/lib/genalloc.c
index e67f97495dd5..736c3b06398e 100644
--- a/lib/genalloc.c
+++ b/lib/genalloc.c
@@ -10,6 +10,7 @@
  * Version 2.  See the file COPYING for more details.
  */
 
+#include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/bitmap.h>
 #include <linux/genalloc.h>
diff --git a/lib/inflate.c b/lib/inflate.c
index d10255973a9f..677b738c2204 100644
--- a/lib/inflate.c
+++ b/lib/inflate.c
@@ -103,6 +103,7 @@
       the two sets of lengths.
  */
 #include <linux/compiler.h>
+#include <linux/slab.h>
 
 #ifdef RCSID
 static char rcsid[] = "#Id: inflate.c,v 0.14 1993/06/10 13:27:04 jloup Exp #";
diff --git a/lib/kasprintf.c b/lib/kasprintf.c
index c5ff1fd10030..9c4233b23783 100644
--- a/lib/kasprintf.c
+++ b/lib/kasprintf.c
@@ -6,6 +6,7 @@
 
 #include <stdarg.h>
 #include <linux/module.h>
+#include <linux/slab.h>
 #include <linux/types.h>
 #include <linux/string.h>
 
diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
index c9d3a3e8405d..7b48d44ced6e 100644
--- a/lib/kobject_uevent.c
+++ b/lib/kobject_uevent.c
@@ -18,6 +18,7 @@
 #include <linux/string.h>
 #include <linux/kobject.h>
 #include <linux/module.h>
+#include <linux/slab.h>
 
 #include <linux/socket.h>
 #include <linux/skbuff.h>
diff --git a/lib/kref.c b/lib/kref.c
index 9ecd6e865610..6d19f690380b 100644
--- a/lib/kref.c
+++ b/lib/kref.c
@@ -13,6 +13,7 @@
 
 #include <linux/kref.h>
 #include <linux/module.h>
+#include <linux/slab.h>
 
 /**
  * kref_set - initialize object and set refcount to requested number.
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index 6b9670d6bbf9..0871582aa29d 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -28,7 +28,6 @@
 #include <linux/slab.h>
 #include <linux/notifier.h>
 #include <linux/cpu.h>
-#include <linux/gfp.h>
 #include <linux/string.h>
 #include <linux/bitops.h>
 #include <linux/rcupdate.h>
diff --git a/lib/scatterlist.c b/lib/scatterlist.c
index 0d475d8167bf..9afa25b52a83 100644
--- a/lib/scatterlist.c
+++ b/lib/scatterlist.c
@@ -7,6 +7,7 @@
  * Version 2. See the file COPYING for more details.
  */
 #include <linux/module.h>
+#include <linux/slab.h>
 #include <linux/scatterlist.h>
 #include <linux/highmem.h>
 
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 437eedb5a53b..5fddf720da73 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -28,6 +28,7 @@
 #include <linux/types.h>
 #include <linux/ctype.h>
 #include <linux/highmem.h>
+#include <linux/gfp.h>
 
 #include <asm/io.h>
 #include <asm/dma.h>
diff --git a/lib/textsearch.c b/lib/textsearch.c
index 9fbcb44c554f..d608331b3e47 100644
--- a/lib/textsearch.c
+++ b/lib/textsearch.c
@@ -103,6 +103,7 @@
 #include <linux/rcupdate.h>
 #include <linux/err.h>
 #include <linux/textsearch.h>
+#include <linux/slab.h>
 
 static LIST_HEAD(ts_ops);
 static DEFINE_SPINLOCK(ts_mod_lock);