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>

18 files changed, 16 insertions, 3 deletions

diff --git a/arch/powerpc/sysdev/cpm1.c b/arch/powerpc/sysdev/cpm1.c
index ecad10d4e9281..4dae3698bf24e 100644
--- a/arch/powerpc/sysdev/cpm1.c
+++ b/arch/powerpc/sysdev/cpm1.c
@@ -31,6 +31,7 @@
 #include <linux/irq.h>
 #include <linux/module.h>
 #include <linux/spinlock.h>
+#include <linux/slab.h>
 #include <asm/page.h>
 #include <asm/pgtable.h>
 #include <asm/8xx_immap.h>
diff --git a/arch/powerpc/sysdev/cpm_common.c b/arch/powerpc/sysdev/cpm_common.c
index 9de72c96e6d1b..88b9812c854fd 100644
--- a/arch/powerpc/sysdev/cpm_common.c
+++ b/arch/powerpc/sysdev/cpm_common.c
@@ -21,6 +21,7 @@
 #include <linux/of_device.h>
 #include <linux/spinlock.h>
 #include <linux/of.h>
+#include <linux/slab.h>
 
 #include <asm/udbg.h>
 #include <asm/io.h>
diff --git a/arch/powerpc/sysdev/dart_iommu.c b/arch/powerpc/sysdev/dart_iommu.c
index bafc3f85360d3..c8b96ed7c0158 100644
--- a/arch/powerpc/sysdev/dart_iommu.c
+++ b/arch/powerpc/sysdev/dart_iommu.c
@@ -29,7 +29,6 @@
 
 #include <linux/init.h>
 #include <linux/types.h>
-#include <linux/slab.h>
 #include <linux/mm.h>
 #include <linux/spinlock.h>
 #include <linux/string.h>
@@ -38,6 +37,7 @@
 #include <linux/vmalloc.h>
 #include <linux/suspend.h>
 #include <linux/lmb.h>
+#include <linux/gfp.h>
 #include <asm/io.h>
 #include <asm/prom.h>
 #include <asm/iommu.h>
diff --git a/arch/powerpc/sysdev/fsl_gtm.c b/arch/powerpc/sysdev/fsl_gtm.c
index 714ec02fed2ea..eca4545dd52ee 100644
--- a/arch/powerpc/sysdev/fsl_gtm.c
+++ b/arch/powerpc/sysdev/fsl_gtm.c
@@ -20,6 +20,7 @@
 #include <linux/of.h>
 #include <linux/spinlock.h>
 #include <linux/bitops.h>
+#include <linux/slab.h>
 #include <asm/fsl_gtm.h>
 
 #define GTCFR_STP(x)		((x) & 1 ? 1 << 5 : 1 << 1)
diff --git a/arch/powerpc/sysdev/fsl_msi.c b/arch/powerpc/sysdev/fsl_msi.c
index e094367d7739e..3482e3fd89c04 100644
--- a/arch/powerpc/sysdev/fsl_msi.c
+++ b/arch/powerpc/sysdev/fsl_msi.c
@@ -16,6 +16,7 @@
 #include <linux/bootmem.h>
 #include <linux/msi.h>
 #include <linux/pci.h>
+#include <linux/slab.h>
 #include <linux/of_platform.h>
 #include <sysdev/fsl_soc.h>
 #include <asm/prom.h>
diff --git a/arch/powerpc/sysdev/fsl_pci.c b/arch/powerpc/sysdev/fsl_pci.c
index e1a028c1f18d0..a14760fe513a6 100644
--- a/arch/powerpc/sysdev/fsl_pci.c
+++ b/arch/powerpc/sysdev/fsl_pci.c
@@ -25,6 +25,7 @@
 #include <linux/bootmem.h>
 #include <linux/lmb.h>
 #include <linux/log2.h>
+#include <linux/slab.h>
 
 #include <asm/io.h>
 #include <asm/prom.h>
diff --git a/arch/powerpc/sysdev/fsl_rio.c b/arch/powerpc/sysdev/fsl_rio.c
index 757a83fe5e59f..71fba88f50db8 100644
--- a/arch/powerpc/sysdev/fsl_rio.c
+++ b/arch/powerpc/sysdev/fsl_rio.c
@@ -23,6 +23,7 @@
 #include <linux/rio_drv.h>
 #include <linux/of_platform.h>
 #include <linux/delay.h>
+#include <linux/slab.h>
 
 #include <asm/io.h>
 
diff --git a/arch/powerpc/sysdev/mpc8xxx_gpio.c b/arch/powerpc/sysdev/mpc8xxx_gpio.c
index ee1c0e1cf4a7d..6478eb10691aa 100644
--- a/arch/powerpc/sysdev/mpc8xxx_gpio.c
+++ b/arch/powerpc/sysdev/mpc8xxx_gpio.c
@@ -15,6 +15,7 @@
 #include <linux/of.h>
 #include <linux/of_gpio.h>
 #include <linux/gpio.h>
+#include <linux/slab.h>
 
 #define MPC8XXX_GPIO_PINS	32
 
diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
index 339e8a3e26d20..260295b105576 100644
--- a/arch/powerpc/sysdev/mpic.c
+++ b/arch/powerpc/sysdev/mpic.c
@@ -26,6 +26,7 @@
 #include <linux/bootmem.h>
 #include <linux/spinlock.h>
 #include <linux/pci.h>
+#include <linux/slab.h>
 
 #include <asm/ptrace.h>
 #include <asm/signal.h>
diff --git a/arch/powerpc/sysdev/msi_bitmap.c b/arch/powerpc/sysdev/msi_bitmap.c
index 5a32cbef9b6c2..5287e95cec3a5 100644
--- a/arch/powerpc/sysdev/msi_bitmap.c
+++ b/arch/powerpc/sysdev/msi_bitmap.c
@@ -8,6 +8,7 @@
  *
  */
 
+#include <linux/slab.h>
 #include <linux/kernel.h>
 #include <linux/bitmap.h>
 #include <asm/msi_bitmap.h>
diff --git a/arch/powerpc/sysdev/of_rtc.c b/arch/powerpc/sysdev/of_rtc.c
index 3d54450640c15..c9e803f3e267a 100644
--- a/arch/powerpc/sysdev/of_rtc.c
+++ b/arch/powerpc/sysdev/of_rtc.c
@@ -12,6 +12,7 @@
 #include <linux/of.h>
 #include <linux/init.h>
 #include <linux/of_platform.h>
+#include <linux/slab.h>
 
 static __initdata struct {
 	const char *compatible;
diff --git a/arch/powerpc/sysdev/pmi.c b/arch/powerpc/sysdev/pmi.c
index aaa915998eb63..652652db4ce28 100644
--- a/arch/powerpc/sysdev/pmi.c
+++ b/arch/powerpc/sysdev/pmi.c
@@ -25,6 +25,7 @@
  */
 
 #include <linux/interrupt.h>
+#include <linux/slab.h>
 #include <linux/completion.h>
 #include <linux/spinlock.h>
 #include <linux/workqueue.h>
diff --git a/arch/powerpc/sysdev/ppc4xx_gpio.c b/arch/powerpc/sysdev/ppc4xx_gpio.c
index 110efe2a54fca..3812fc366becf 100644
--- a/arch/powerpc/sysdev/ppc4xx_gpio.c
+++ b/arch/powerpc/sysdev/ppc4xx_gpio.c
@@ -29,6 +29,7 @@
 #include <linux/of_gpio.h>
 #include <linux/gpio.h>
 #include <linux/types.h>
+#include <linux/slab.h>
 
 #define GPIO_MASK(gpio)		(0x80000000 >> (gpio))
 #define GPIO_MASK2(gpio)	(0xc0000000 >> ((gpio) * 2))
diff --git a/arch/powerpc/sysdev/ppc4xx_pci.c b/arch/powerpc/sysdev/ppc4xx_pci.c
index 8aa33021e50b3..106d767bf65bf 100644
--- a/arch/powerpc/sysdev/ppc4xx_pci.c
+++ b/arch/powerpc/sysdev/ppc4xx_pci.c
@@ -24,6 +24,7 @@
 #include <linux/of.h>
 #include <linux/bootmem.h>
 #include <linux/delay.h>
+#include <linux/slab.h>
 
 #include <asm/io.h>
 #include <asm/pci-bridge.h>
diff --git a/arch/powerpc/sysdev/qe_lib/gpio.c b/arch/powerpc/sysdev/qe_lib/gpio.c
index 8e7a7767dd5c4..dc8f8d6180748 100644
--- a/arch/powerpc/sysdev/qe_lib/gpio.c
+++ b/arch/powerpc/sysdev/qe_lib/gpio.c
@@ -19,6 +19,7 @@
 #include <linux/of.h>
 #include <linux/of_gpio.h>
 #include <linux/gpio.h>
+#include <linux/slab.h>
 #include <asm/qe.h>
 
 struct qe_gpio_chip {
diff --git a/arch/powerpc/sysdev/qe_lib/ucc.c b/arch/powerpc/sysdev/qe_lib/ucc.c
index ebb442ea19177..fa589b21dbcdd 100644
--- a/arch/powerpc/sysdev/qe_lib/ucc.c
+++ b/arch/powerpc/sysdev/qe_lib/ucc.c
@@ -16,7 +16,6 @@
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/errno.h>
-#include <linux/slab.h>
 #include <linux/stddef.h>
 #include <linux/spinlock.h>
 #include <linux/module.h>
diff --git a/arch/powerpc/sysdev/simple_gpio.c b/arch/powerpc/sysdev/simple_gpio.c
index 43c4569e24b78..d5fb173e588cb 100644
--- a/arch/powerpc/sysdev/simple_gpio.c
+++ b/arch/powerpc/sysdev/simple_gpio.c
@@ -21,6 +21,7 @@
 #include <linux/of.h>
 #include <linux/of_gpio.h>
 #include <linux/gpio.h>
+#include <linux/slab.h>
 #include <asm/prom.h>
 #include "simple_gpio.h"
 
diff --git a/arch/powerpc/sysdev/tsi108_pci.c b/arch/powerpc/sysdev/tsi108_pci.c
index 595034cfb85aa..0ab9281e49aec 100644
--- a/arch/powerpc/sysdev/tsi108_pci.c
+++ b/arch/powerpc/sysdev/tsi108_pci.c
@@ -24,7 +24,6 @@
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/pci.h>
-#include <linux/slab.h>
 #include <linux/irq.h>
 #include <linux/interrupt.h>