linux/drivers/staging/hv
Tejun Heo 5a0e3ad6af 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>
2010-03-30 22:02:32 +09:00
..
BlkVsc.c Staging: hv: Fix some missing author names 2009-11-30 16:39:35 -08:00
Channel.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
Channel.h Staging: hv: remove PFN_CHANNEL_CALLBACK 2009-09-15 12:02:03 -07:00
ChannelInterface.c Staging: hv: remove function pointer typedefs from VmbusApi.h 2009-09-15 12:02:03 -07:00
ChannelInterface.h Staging: hv: move VmbusApi.h 2009-09-15 12:02:00 -07:00
ChannelMgmt.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
ChannelMgmt.h Staging: hv: fix oops in vmbus - missing #include 2009-10-30 14:47:43 -07:00
Connection.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
Hv.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
Hv.h Staging: hv: Remove xen legacy code and check for Hyper-V 2010-03-03 16:42:37 -08:00
Kconfig Staging: hv: adjust Hyper-V Kconfig 2009-09-15 12:01:54 -07:00
Makefile Staging: hv: remove Sources.c 2009-09-15 12:01:55 -07:00
NetVsc.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
NetVsc.h Staging: hv: Fix some missing author names 2009-11-30 16:39:35 -08:00
NetVscApi.h Staging: hv: remove unneeded OnClose callback 2010-03-03 16:42:36 -08:00
RingBuffer.c Staging: hv: fix various coding style issues in RingBuffer.c 2010-03-03 16:42:37 -08:00
RingBuffer.h Staging: hv: move osd.h 2009-09-15 12:01:56 -07:00
RndisFilter.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
RndisFilter.h Staging: hv: fix up typedefs in NetVscApi.h 2009-09-15 12:01:59 -07:00
StorVsc.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
StorVscApi.h Staging: hv: remove unneeded OnHostReset callback 2010-03-03 16:42:36 -08:00
TODO Staging: hv TODO patches 2009-10-30 14:47:42 -07:00
VersionInfo.h Staging: hv: Add proper versioning to HV drivers 2010-03-03 16:42:37 -08:00
Vmbus.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
VmbusApi.h Staging: hv: remove function pointer typedefs from VmbusApi.h 2009-09-15 12:02:03 -07:00
VmbusChannelInterface.h Staging: hv: move VmbusChannelInterface.h 2009-09-15 12:02:01 -07:00
VmbusPacketFormat.h Staging: hv: move VmbusPacketFormat.h 2009-09-15 12:02:01 -07:00
VmbusPrivate.h Staging: hv: remove more usages of internal list routines 2009-09-15 12:02:04 -07:00
blkvsc_drv.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
hv_api.h Staging: fix assorted typos all over the place 2009-12-11 12:23:20 -08:00
logging.h Staging: hv: move logging.h 2009-09-15 12:02:00 -07:00
netvsc_drv.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
osd.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
osd.h Staging: hv: fix oops in vmbus - missing #include 2009-10-30 14:47:43 -07:00
rndis.h Staging: hv: rndis.h: typedef removal, part 2 2009-09-15 12:01:57 -07:00
storvsc_drv.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
vmbus.h Staging: hv: Rename struct device_context and re-arrange the fields inside 2010-03-03 16:42:37 -08:00
vmbus_drv.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
vstorage.h Staging: hv: remove typedefs from VmbusPacketFormat.h 2009-09-15 12:01:59 -07:00