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>

21 files changed, 21 insertions, 1 deletions

diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index dc55a62859c6..207e7a85aeb0 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -23,7 +23,6 @@
 #include <linux/delay.h>
 #include <linux/ioport.h>
 #include <linux/sched.h>
-#include <linux/slab.h>
 #include <linux/vmalloc.h>
 #include <linux/errno.h>
 #include <linux/init.h>
@@ -35,6 +34,7 @@
 #include <linux/moduleparam.h>
 #include <linux/dma-mapping.h>
 #include <linux/debugfs.h>
+#include <linux/slab.h>
 
 #include "../core/hcd.h"
 
diff --git a/drivers/usb/host/ehci-mxc.c b/drivers/usb/host/ehci-mxc.c
index 23cd917088b4..ead59f42e69b 100644
--- a/drivers/usb/host/ehci-mxc.c
+++ b/drivers/usb/host/ehci-mxc.c
@@ -21,6 +21,7 @@
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/usb/otg.h>
+#include <linux/slab.h>
 
 #include <mach/mxc_ehci.h>
 
diff --git a/drivers/usb/host/ehci-omap.c b/drivers/usb/host/ehci-omap.c
index f0282d6bb7aa..a67a0030dd57 100644
--- a/drivers/usb/host/ehci-omap.c
+++ b/drivers/usb/host/ehci-omap.c
@@ -37,6 +37,7 @@
 #include <linux/clk.h>
 #include <linux/gpio.h>
 #include <linux/regulator/consumer.h>
+#include <linux/slab.h>
 #include <plat/usb.h>
 
 /*
diff --git a/drivers/usb/host/fhci-hcd.c b/drivers/usb/host/fhci-hcd.c
index 5dcfb3de9945..15379c636143 100644
--- a/drivers/usb/host/fhci-hcd.c
+++ b/drivers/usb/host/fhci-hcd.c
@@ -27,6 +27,7 @@
 #include <linux/usb.h>
 #include <linux/of_platform.h>
 #include <linux/of_gpio.h>
+#include <linux/slab.h>
 #include <asm/qe.h>
 #include <asm/fsl_gtm.h>
 #include "../core/hcd.h"
diff --git a/drivers/usb/host/fhci-mem.c b/drivers/usb/host/fhci-mem.c
index 2c0736c99712..5591bfb499d1 100644
--- a/drivers/usb/host/fhci-mem.c
+++ b/drivers/usb/host/fhci-mem.c
@@ -18,6 +18,7 @@
 #include <linux/kernel.h>
 #include <linux/types.h>
 #include <linux/delay.h>
+#include <linux/slab.h>
 #include <linux/list.h>
 #include <linux/usb.h>
 #include "../core/hcd.h"
diff --git a/drivers/usb/host/fhci-q.c b/drivers/usb/host/fhci-q.c
index b0a1446ba292..f73c92359beb 100644
--- a/drivers/usb/host/fhci-q.c
+++ b/drivers/usb/host/fhci-q.c
@@ -19,6 +19,7 @@
 #include <linux/types.h>
 #include <linux/spinlock.h>
 #include <linux/errno.h>
+#include <linux/slab.h>
 #include <linux/list.h>
 #include <linux/usb.h>
 #include "../core/hcd.h"
diff --git a/drivers/usb/host/fhci-tds.c b/drivers/usb/host/fhci-tds.c
index e1232890c78b..57013479d7f7 100644
--- a/drivers/usb/host/fhci-tds.c
+++ b/drivers/usb/host/fhci-tds.c
@@ -18,6 +18,7 @@
 #include <linux/kernel.h>
 #include <linux/types.h>
 #include <linux/errno.h>
+#include <linux/slab.h>
 #include <linux/list.h>
 #include <linux/io.h>
 #include <linux/usb.h>
diff --git a/drivers/usb/host/hwa-hc.c b/drivers/usb/host/hwa-hc.c
index 88b03214622b..35742f8c7cda 100644
--- a/drivers/usb/host/hwa-hc.c
+++ b/drivers/usb/host/hwa-hc.c
@@ -55,6 +55,7 @@
  */
 #include <linux/kernel.h>
 #include <linux/init.h>
+#include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/workqueue.h>
 #include <linux/wait.h>
diff --git a/drivers/usb/host/imx21-hcd.c b/drivers/usb/host/imx21-hcd.c
index 213e270e1c29..8a12f297645f 100644
--- a/drivers/usb/host/imx21-hcd.c
+++ b/drivers/usb/host/imx21-hcd.c
@@ -54,6 +54,7 @@
 #include <linux/kernel.h>
 #include <linux/list.h>
 #include <linux/platform_device.h>
+#include <linux/slab.h>
 #include <linux/usb.h>
 
 #include "../core/hcd.h"
diff --git a/drivers/usb/host/isp116x-hcd.c b/drivers/usb/host/isp116x-hcd.c
index a2b305477afe..92de71dc7729 100644
--- a/drivers/usb/host/isp116x-hcd.c
+++ b/drivers/usb/host/isp116x-hcd.c
@@ -62,6 +62,7 @@
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/list.h>
+#include <linux/slab.h>
 #include <linux/usb.h>
 #include <linux/usb/isp116x.h>
 #include <linux/platform_device.h>
diff --git a/drivers/usb/host/ohci-q.c b/drivers/usb/host/ohci-q.c
index 35288bcae0db..83094d067e0f 100644
--- a/drivers/usb/host/ohci-q.c
+++ b/drivers/usb/host/ohci-q.c
@@ -8,6 +8,7 @@
  */
 
 #include <linux/irq.h>
+#include <linux/slab.h>
 
 static void urb_free_priv (struct ohci_hcd *hc, urb_priv_t *urb_priv)
 {
diff --git a/drivers/usb/host/r8a66597-hcd.c b/drivers/usb/host/r8a66597-hcd.c
index f71a73a93d0c..d478ffad59b4 100644
--- a/drivers/usb/host/r8a66597-hcd.c
+++ b/drivers/usb/host/r8a66597-hcd.c
@@ -37,6 +37,7 @@
 #include <linux/io.h>
 #include <linux/mm.h>
 #include <linux/irq.h>
+#include <linux/slab.h>
 #include <asm/cacheflush.h>
 
 #include "../core/hcd.h"
diff --git a/drivers/usb/host/uhci-debug.c b/drivers/usb/host/uhci-debug.c
index e52b954dda47..98cf0b26b968 100644
--- a/drivers/usb/host/uhci-debug.c
+++ b/drivers/usb/host/uhci-debug.c
@@ -9,6 +9,7 @@
  * (C) Copyright 1999-2001 Johannes Erdfelt
  */
 
+#include <linux/slab.h>
 #include <linux/kernel.h>
 #include <linux/debugfs.h>
 #include <linux/smp_lock.h>
diff --git a/drivers/usb/host/whci/asl.c b/drivers/usb/host/whci/asl.c
index 562eba108816..773249306031 100644
--- a/drivers/usb/host/whci/asl.c
+++ b/drivers/usb/host/whci/asl.c
@@ -16,6 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 #include <linux/kernel.h>
+#include <linux/gfp.h>
 #include <linux/dma-mapping.h>
 #include <linux/uwb/umc.h>
 #include <linux/usb.h>
diff --git a/drivers/usb/host/whci/debug.c b/drivers/usb/host/whci/debug.c
index 8c1c610c9513..c5305b599ca0 100644
--- a/drivers/usb/host/whci/debug.c
+++ b/drivers/usb/host/whci/debug.c
@@ -15,6 +15,7 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
+#include <linux/slab.h>
 #include <linux/kernel.h>
 #include <linux/debugfs.h>
 #include <linux/seq_file.h>
diff --git a/drivers/usb/host/whci/init.c b/drivers/usb/host/whci/init.c
index 34a783cb0133..f7582e8e2169 100644
--- a/drivers/usb/host/whci/init.c
+++ b/drivers/usb/host/whci/init.c
@@ -16,6 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 #include <linux/kernel.h>
+#include <linux/gfp.h>
 #include <linux/dma-mapping.h>
 #include <linux/uwb/umc.h>
 
diff --git a/drivers/usb/host/whci/pzl.c b/drivers/usb/host/whci/pzl.c
index 0db3fb2dc03a..33c5580b4d25 100644
--- a/drivers/usb/host/whci/pzl.c
+++ b/drivers/usb/host/whci/pzl.c
@@ -16,6 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 #include <linux/kernel.h>
+#include <linux/gfp.h>
 #include <linux/dma-mapping.h>
 #include <linux/uwb/umc.h>
 #include <linux/usb.h>
diff --git a/drivers/usb/host/whci/qset.c b/drivers/usb/host/whci/qset.c
index 7d4204db0f61..141d049beb3e 100644
--- a/drivers/usb/host/whci/qset.c
+++ b/drivers/usb/host/whci/qset.c
@@ -17,6 +17,7 @@
  */
 #include <linux/kernel.h>
 #include <linux/dma-mapping.h>
+#include <linux/slab.h>
 #include <linux/uwb/umc.h>
 #include <linux/usb.h>
 
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index bba9b19ed1b9..c09539bad1ee 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -22,6 +22,7 @@
 
 #include <linux/usb.h>
 #include <linux/pci.h>
+#include <linux/slab.h>
 #include <linux/dmapool.h>
 
 #include "xhci.h"
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 6ba841bca4a2..85d7e8f2085e 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -65,6 +65,7 @@
  */
 
 #include <linux/scatterlist.h>
+#include <linux/slab.h>
 #include "xhci.h"
 
 /*
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 492a61c2c79d..7e4277273908 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -23,6 +23,7 @@
 #include <linux/irq.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
+#include <linux/slab.h>
 
 #include "xhci.h"