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, 14 insertions, 0 deletions

diff --git a/drivers/input/misc/88pm860x_onkey.c b/drivers/input/misc/88pm860x_onkey.c
index 69a48e8701b9..40dabd8487b5 100644
--- a/drivers/input/misc/88pm860x_onkey.c
+++ b/drivers/input/misc/88pm860x_onkey.c
@@ -25,6 +25,7 @@
 #include <linux/input.h>
 #include <linux/interrupt.h>
 #include <linux/mfd/88pm860x.h>
+#include <linux/slab.h>
 
 #define PM8607_WAKEUP		0x0b
 
diff --git a/drivers/input/misc/ati_remote2.c b/drivers/input/misc/ati_remote2.c
index 15be5430bc6d..2124b99378bb 100644
--- a/drivers/input/misc/ati_remote2.c
+++ b/drivers/input/misc/ati_remote2.c
@@ -10,6 +10,7 @@
  */
 
 #include <linux/usb/input.h>
+#include <linux/slab.h>
 
 #define DRIVER_DESC    "ATI/Philips USB RF remote driver"
 #define DRIVER_VERSION "0.3"
diff --git a/drivers/input/misc/bfin_rotary.c b/drivers/input/misc/bfin_rotary.c
index 61d10177fa83..4f72bdd69410 100644
--- a/drivers/input/misc/bfin_rotary.c
+++ b/drivers/input/misc/bfin_rotary.c
@@ -13,6 +13,7 @@
 #include <linux/pm.h>
 #include <linux/platform_device.h>
 #include <linux/input.h>
+#include <linux/slab.h>
 
 #include <asm/portmux.h>
 #include <asm/bfin_rotary.h>
diff --git a/drivers/input/misc/cobalt_btns.c b/drivers/input/misc/cobalt_btns.c
index ee73d7219c92..fd8407a29631 100644
--- a/drivers/input/misc/cobalt_btns.c
+++ b/drivers/input/misc/cobalt_btns.c
@@ -22,6 +22,7 @@
 #include <linux/ioport.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <linux/slab.h>
 
 #define BUTTONS_POLL_INTERVAL	30	/* msec */
 #define BUTTONS_COUNT_THRESHOLD	3
diff --git a/drivers/input/misc/dm355evm_keys.c b/drivers/input/misc/dm355evm_keys.c
index 766c06911f41..19af682c24fb 100644
--- a/drivers/input/misc/dm355evm_keys.c
+++ b/drivers/input/misc/dm355evm_keys.c
@@ -10,6 +10,7 @@
  */
 #include <linux/kernel.h>
 #include <linux/init.h>
+#include <linux/slab.h>
 #include <linux/input.h>
 #include <linux/input/sparse-keymap.h>
 #include <linux/platform_device.h>
diff --git a/drivers/input/misc/pcap_keys.c b/drivers/input/misc/pcap_keys.c
index 7ea969347ca9..99335c286250 100644
--- a/drivers/input/misc/pcap_keys.c
+++ b/drivers/input/misc/pcap_keys.c
@@ -17,6 +17,7 @@
 #include <linux/platform_device.h>
 #include <linux/input.h>
 #include <linux/mfd/ezx-pcap.h>
+#include <linux/slab.h>
 
 struct pcap_keys {
 	struct pcap_chip *pcap;
diff --git a/drivers/input/misc/pcf50633-input.c b/drivers/input/misc/pcf50633-input.c
index 008de0c5834b..95562735728d 100644
--- a/drivers/input/misc/pcf50633-input.c
+++ b/drivers/input/misc/pcf50633-input.c
@@ -20,6 +20,7 @@
 #include <linux/device.h>
 #include <linux/platform_device.h>
 #include <linux/input.h>
+#include <linux/slab.h>
 
 #include <linux/mfd/pcf50633/core.h>
 
diff --git a/drivers/input/misc/rotary_encoder.c b/drivers/input/misc/rotary_encoder.c
index 4ae07935985e..1f8e0108962e 100644
--- a/drivers/input/misc/rotary_encoder.c
+++ b/drivers/input/misc/rotary_encoder.c
@@ -22,6 +22,7 @@
 #include <linux/platform_device.h>
 #include <linux/gpio.h>
 #include <linux/rotary_encoder.h>
+#include <linux/slab.h>
 
 #define DRV_NAME "rotary-encoder"
 
diff --git a/drivers/input/misc/sgi_btns.c b/drivers/input/misc/sgi_btns.c
index be3a15f5b25d..1a80c0dab83b 100644
--- a/drivers/input/misc/sgi_btns.c
+++ b/drivers/input/misc/sgi_btns.c
@@ -22,6 +22,7 @@
 #include <linux/ioport.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <linux/slab.h>
 
 #ifdef CONFIG_SGI_IP22
 #include <asm/sgi/ioc.h>
diff --git a/drivers/input/misc/sparcspkr.c b/drivers/input/misc/sparcspkr.c
index b064419b90a2..0d45422f8095 100644
--- a/drivers/input/misc/sparcspkr.c
+++ b/drivers/input/misc/sparcspkr.c
@@ -9,6 +9,7 @@
 #include <linux/init.h>
 #include <linux/input.h>
 #include <linux/of_device.h>
+#include <linux/slab.h>
 
 #include <asm/io.h>
 
diff --git a/drivers/input/misc/twl4030-vibra.c b/drivers/input/misc/twl4030-vibra.c
index 2fb79e064da3..fee9eac8e04a 100644
--- a/drivers/input/misc/twl4030-vibra.c
+++ b/drivers/input/misc/twl4030-vibra.c
@@ -30,6 +30,7 @@
 #include <linux/i2c/twl.h>
 #include <linux/mfd/twl4030-codec.h>
 #include <linux/input.h>
+#include <linux/slab.h>
 
 /* MODULE ID2 */
 #define LEDEN		0x00
diff --git a/drivers/input/misc/winbond-cir.c b/drivers/input/misc/winbond-cir.c
index 9c155a43abc2..64f1de7960c6 100644
--- a/drivers/input/misc/winbond-cir.c
+++ b/drivers/input/misc/winbond-cir.c
@@ -56,6 +56,7 @@
 #include <linux/io.h>
 #include <linux/bitrev.h>
 #include <linux/bitops.h>
+#include <linux/slab.h>
 
 #define DRVNAME "winbond-cir"
 
diff --git a/drivers/input/misc/wistron_btns.c b/drivers/input/misc/wistron_btns.c
index c0afb71a3a6d..04d5a4a3181f 100644
--- a/drivers/input/misc/wistron_btns.c
+++ b/drivers/input/misc/wistron_btns.c
@@ -29,6 +29,7 @@
 #include <linux/module.h>
 #include <linux/preempt.h>
 #include <linux/string.h>
+#include <linux/slab.h>
 #include <linux/types.h>
 #include <linux/platform_device.h>
 #include <linux/leds.h>
diff --git a/drivers/input/misc/wm831x-on.c b/drivers/input/misc/wm831x-on.c
index 1e54bce72db5..c3d7ba5f5b47 100644
--- a/drivers/input/misc/wm831x-on.c
+++ b/drivers/input/misc/wm831x-on.c
@@ -19,6 +19,7 @@
 
 #include <linux/module.h>
 #include <linux/init.h>
+#include <linux/slab.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/input.h>