Removing the implicit presence of module.h from almost everywhere
will reveal this implicit usage of paca.h and string.h headers as
follows:

arch/powerpc/platforms/pseries/plpar_wrappers.h:22: error: implicit declaration of function 'get_lppaca'
arch/powerpc/platforms/pseries/plpar_wrappers.h:208: error: implicit declaration of function 'memcpy'
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

We've been getting the header implicitly via module.h in the past
but when we clean that up, we'll get this failure:

  CC      arch/powerpc/platforms/cell/beat_spu_priv1.o
In file included from arch/powerpc/platforms/cell/beat_spu_priv1.c:22:
arch/powerpc/include/asm/spu.h:190: error: field 'list_mutex' has incomplete type
make[2]: *** [arch/powerpc/platforms/cell/beat_spu_priv1.o] Error 1
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

This file only needs export.h to get EXPORT_SYMBOL, but in doing
so, it uncovers an implicit use of linux/cache.h as follows:

 CC      arch/powerpc/kernel/firmware.o
arch/powerpc/kernel/firmware.c:20: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__read_mostly'
arch/powerpc/kernel/firmware.c:21: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__used'
make[2]: *** [arch/powerpc/kernel/firmware.o] Error 1
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

We can convert this file to using export.h since it only wants
to export symbols, but when we do we'll see also that it was
implicitly getting notifier.h from module.h via this failure:

  CC      arch/powerpc/platforms/cell/spu_notify.o
arch/powerpc/platforms/cell/spu_notify.c:28: warning: type defaults to 'int' in declaration of 'BLOCKING_NOTIFIER_HEAD'
arch/powerpc/platforms/cell/spu_notify.c:28: warning: parameter names (without types) in function declaration
arch/powerpc/platforms/cell/spu_notify.c: In function 'spu_switch_notify':
arch/powerpc/platforms/cell/spu_notify.c:32: error: implicit declaration of function 'blocking_notifier_call_chain'
arch/powerpc/platforms/cell/spu_notify.c:32: error: 'spu_switch_notifier' undeclared (first use in this function)
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

This has been relying on the fact that the parent file would have
module.h (and thus nearly everything) present.  But once we fix that,
we'll get stuck with this failure:

In file included from arch/powerpc/platforms/cell/beat_spu_priv1.c:26:
arch/powerpc/platforms/cell/beat_wrapper.h: In function 'beat_eeprom_write':
arch/powerpc/platforms/cell/beat_wrapper.h:160: error: implicit declaration of function 'memcpy'

and many more instances of the same.  Fix it in advance.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

They are getting it through device.h --> module.h path, but we want
to clean that up.  This is a sample of what will happen if we don't:

  pseries/iommu.c: In function 'tce_build_pSeriesLP':
  pseries/iommu.c:136: error: implicit declaration of function 'show_stack'

  pseries/eeh.c: In function 'eeh_token_to_phys':
  pseries/eeh.c:359: error: 'init_mm' undeclared (first use in this function)

  pseries/eeh_event.c: In function 'eeh_event_handler':
  pseries/eeh_event.c:63: error: implicit declaration of function 'daemonize'
  pseries/eeh_event.c:64: error: implicit declaration of function 'set_current_state'
  pseries/eeh_event.c:64: error: 'TASK_INTERRUPTIBLE' undeclared (first use in this function)
  pseries/eeh_event.c:64: error: (Each undeclared identifier is reported only once
  pseries/eeh_event.c:64: error: for each function it appears in.)
  pseries/eeh_event.c: In function 'eeh_thread_launcher':
  pseries/eeh_event.c:109: error: 'CLONE_KERNEL' undeclared (first use in this function)

  hotplug-cpu.c: In function 'pseries_mach_cpu_die':
  hotplug-cpu.c:115: error: implicit declaration of function 'idle_task_exit'

  kernel/swsusp_64.c: In function 'do_after_copyback':
  kernel/swsusp_64.c:17: error: implicit declaration of function 'touch_softlockup_watchdog'

  cell/spufs/context.c: In function 'alloc_spu_context':
  cell/spufs/context.c:60: error: implicit declaration of function 'get_task_mm'
  cell/spufs/context.c:60: warning: assignment makes pointer from integer without a cast
  cell/spufs/context.c: In function 'spu_forget':
  cell/spufs/context.c:127: error: implicit declaration of function 'mmput'

  pasemi/dma_lib.c: In function 'pasemi_dma_stop_chan':
  pasemi/dma_lib.c:332: error: implicit declaration of function 'cond_resched'

  sysdev/fsl_lbc.c: In function 'fsl_lbc_ctrl_irq':
  sysdev/fsl_lbc.c:247: error: 'TASK_NORMAL' undeclared (first use in this function)

Add in sched.h so these get the definitions they are looking for.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

They get it via module.h (via device.h) but we want to clean that up.
When we do, we'll get things like:

ibmebus.c:314: error: 'S_IWUSR' undeclared here (not in a function)
vio.c:972: error: 'S_IWUSR' undeclared here (not in a function)

so add in the stat header it is using explicitly in advance.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

So that we can clean up the header files and not be relying
on implicit includes from device.h ---> module.h
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

Fix failures in powerpc associated with the previously allowed
implicit module.h presence that now lead to things like this:

arch/powerpc/mm/mmu_context_hash32.c:76:1: error: type defaults to 'int' in declaration of 'EXPORT_SYMBOL_GPL'
arch/powerpc/mm/tlb_hash32.c:48:1: error: type defaults to 'int' in declaration of 'EXPORT_SYMBOL'
arch/powerpc/kernel/pci_32.c:51:1: error: type defaults to 'int' in declaration of 'EXPORT_SYMBOL_GPL'
arch/powerpc/kernel/iomap.c:36:1: error: type defaults to 'int' in declaration of 'EXPORT_SYMBOL'
arch/powerpc/platforms/44x/canyonlands.c:126:1: error: type defaults to 'int' in declaration of 'EXPORT_SYMBOL'
arch/powerpc/kvm/44x.c:168:59: error: 'THIS_MODULE' undeclared (first use in this function)

[with several contibutions from Stephen Rothwell <sfr@canb.auug.org.au>]
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

With module.h being implicitly everywhere via device.h, the absence
of explicitly including something for EXPORT_SYMBOL went unnoticed.
Since we are heading to fix things up and clean module.h from the
device.h file, we need to explicitly include these files now.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

It was coming in via device.h --> module.h etc. but we want to
clean that up.  So explicitly include the header where init_mm
is being declared.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

We want to clean up the chain of includes stumbling through
module.h, and when we do that, we'll see:

  CC      arch/x86/platform/efi/efi_32.o
  efi/efi_32.c: In function ‘efi_call_phys_prelog’:
  efi/efi_32.c:80: error: implicit declaration of function ‘get_cpu_gdt_table’
  efi/efi_32.c:82: error: implicit declaration of function ‘load_gdt’
  make[4]: *** [arch/x86/platform/efi/efi_32.o] Error 1

Include asm/desc.h so that there are no implicit include assumptions.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

These files aren't just exporting symbols -- they are also defining
a MODULE_LICENSE etc. so give them the full module.h file.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

These files were implicitly getting EXPORT_SYMBOL via device.h
which was including module.h, but that will be fixed up shortly.

By fixing these now, we can avoid seeing things like:

arch/x86/kernel/rtc.c:29: warning: type defaults to ‘int’ in declaration of ‘EXPORT_SYMBOL’
arch/x86/kernel/pci-dma.c:20: warning: type defaults to ‘int’ in declaration of ‘EXPORT_SYMBOL’
arch/x86/kernel/e820.c:69: warning: type defaults to ‘int’ in declaration of ‘EXPORT_SYMBOL_GPL’

[ with input from Randy Dunlap <rdunlap@xenotime.net> and also
  from Stephen Rothwell <sfr@canb.auug.org.au> ]
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

In removing the presence of <linux/module.h> from some of the
more common <linux/something.h> files, this implict include
of <linux/topology.h> was uncovered.

  CC      arch/x86/kernel/vsyscall_64.o
  arch/x86/kernel/vsyscall_64.c: In function ‘vsyscall_set_cpu’:
  arch/x86/kernel/vsyscall_64.c:259: error: implicit declaration of function ‘cpu_to_node’

Explicitly call it out so the cleanup can take place.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

These files were relying on module.h to come in via the path
in an include/acpi header file, but we don't want to have
instances of module.h being included from include/* files
if it can be avoided.  Have the files include export.h instead.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

If a file is only exporting symbols and not using the core
modular infrastructure, it can get by with just including
the smaller export.h header, which is a lot smaller than the
module.h header.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

Files which aren't actually using infrastructure from module.h
shouldn't include it, as it is a big header with lots of child
includes spawned off.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

These files are using standard module API things like MODULE_AUTHOR
etc. and so should not be relying on an implicit presence of the
module.h header.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

Some files were using the complete module.h infrastructure without
actually including the header at all.  Fix them up in advance so
once the implicit presence is removed, we won't get failures like this:

  CC [M]  fs/nfsd/nfssvc.o
fs/nfsd/nfssvc.c: In function 'nfsd_create_serv':
fs/nfsd/nfssvc.c:335: error: 'THIS_MODULE' undeclared (first use in this function)
fs/nfsd/nfssvc.c:335: error: (Each undeclared identifier is reported only once
fs/nfsd/nfssvc.c:335: error: for each function it appears in.)
fs/nfsd/nfssvc.c: In function 'nfsd':
fs/nfsd/nfssvc.c:555: error: implicit declaration of function 'module_put_and_exit'
make[3]: *** [fs/nfsd/nfssvc.o] Error 1
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

These files were getting <linux/module.h> via an implicit include
path, but we want to crush those out of existence since they cost
time during compiles of processing thousands of lines of headers
for no reason.  Give them the lightweight header that just contains
the EXPORT_SYMBOL infrastructure.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

To fix this, once the implicit presence of module.h is removed:

net/bridge/br_stp_if.c: In function ‘br_stp_start’:
net/bridge/br_stp_if.c:131: error: implicit declaration of function ‘call_usermodehelper’
net/bridge/br_stp_if.c:131: error: ‘UMH_WAIT_PROC’ undeclared (first use in this function)
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

These files are non modular, but need to export symbols using
the macros now living in export.h -- call out the include so
that things won't break when we remove the implicit presence
of module.h from everywhere.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

These files were getting access to these two via the implicit
presence of module.h everywhere.  They aren't modules, so they
don't need the full module.h inclusion though.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

With calls to modular infrastructure, these files really
needs the full module.h header.  Call it out so some of the
cleanups of implicit and unrequired includes elsewhere can be
cleaned up.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

These files were getting <linux/module.h> via an implicit non-obvious
path, but we want to crush those out of existence since they cost
time during compiles of processing thousands of lines of headers
for no reason.  Give them the lightweight header that just contains
the EXPORT_SYMBOL infrastructure.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

The file rcutiny.c does not need moduleparam.h header, as
there are no modparams in this file.

However rcutiny_plugin.h does define a module_init() and
a module_exit() and it uses the various MODULE_ macros, so
it really does need module.h included.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

Through various other implicit include paths, some files were
getting the full module.h file, and hence living the illusion
that they really only needed moduleparam.h -- but the reality
is that once you remove the module.h presence, these show up:

kernel/params.c:583: warning: ‘struct module_kobject’ declared inside parameter list

Such files really require module.h so simply make it so.  As the
file module.h grabs moduleparam.h on the fly, all will be well.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

With the module.h usage cleanup, we'll get this:

kernel/ksysfs.c:161: error: ‘S_IRUGO’ undeclared here (not in a function)
make[2]: *** [kernel/ksysfs.o] Error 1
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

Up until now, this file was getting percpu.h because nearly every
file was implicitly getting module.h (and all its sub-includes).
But we want to clean that up, so call out percpu.h explicitly.
Otherwise we'll get things like this on an ARM build:

kernel/irq_work.c:48: error: expected declaration specifiers or '...' before 'irq_work_list'
kernel/irq_work.c:48: warning: type defaults to 'int' in declaration of 'DEFINE_PER_CPU'

The same thing was happening for builds on ARM for asm/processor.h

kernel/irq_work.c: In function 'irq_work_sync':
kernel/irq_work.c:166: error: implicit declaration of function 'cpu_relax'
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

These files were implicitly relying on <linux/kmod.h> coming in via
module.h, as without it we get things like:

kernel/power/suspend.c:100: error: implicit declaration of function ‘usermodehelper_disable’
kernel/power/suspend.c:109: error: implicit declaration of function ‘usermodehelper_enable’
kernel/power/user.c:254: error: implicit declaration of function ‘usermodehelper_disable’
kernel/power/user.c:261: error: implicit declaration of function ‘usermodehelper_enable’

kernel/sys.c:317: error: implicit declaration of function ‘usermodehelper_disable’
kernel/sys.c:1816: error: implicit declaration of function ‘call_usermodehelper_setup’
kernel/sys.c:1822: error: implicit declaration of function ‘call_usermodehelper_setfns’
kernel/sys.c:1824: error: implicit declaration of function ‘call_usermodehelper_exec’
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

These files are doing things like module_put and try_module_get
so they need to call out the module.h for explicit inclusion,
rather than getting it via <linux/device.h> which we ideally want
to remove the module.h inclusion from.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

The changed files were only including linux/module.h for the
EXPORT_SYMBOL infrastructure, and nothing else.  Revector them
onto the isolated export header for faster compile times.

Nothing to see here but a whole lot of instances of:

  -#include <linux/module.h>
  +#include <linux/export.h>

This commit is only changing the kernel dir; next targets
will probably be mm, fs, the arch dirs, etc.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

The removal of the implicitly everywhere module.h and its child includes
will reveal this implicit stat.h usage:

mm/dmapool.c:108: error: ‘S_IRUGO’ undeclared here (not in a function)
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

The files changed within are only using the EXPORT_SYMBOL
macro variants.  They are not using core modular infrastructure
and hence don't need module.h but only the export.h header.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

These files were getting <linux/module.h> via an implicit include
path, but we want to crush those out of existence since they cost
time during compiles of processing thousands of lines of headers
for no reason.  Give them the lightweight header that just contains
the EXPORT_SYMBOL infrastructure.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

There is nothing modular in these files, and no reason to drag
in all the 357 headers that module.h brings with it, since
it just slows down compiles.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

This file isn't doing anything with modules and so it should
not be including <linux/module.h> just to get basic stuff
like printk() and min/max.  Revector it to <linux/kernel.h>.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

There are files which use module_param and MODULE_PARM_DESC
back to back.  They only include moduleparam.h which makes sense,
but the implicit presence of module.h everywhere hid the fact
that MODULE_PARM_DESC wasn't in moduleparam.h at all.  Relocate
the macro to moduleparam.h so that the moduleparam infrastructure
can be used independently of module.h
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

A lot of files pull in module.h when all they are really
looking for is the basic EXPORT_SYMBOL functionality. The
recent data from Ingo[1] shows that this is one of several
instances that has a significant impact on compile times,
and it should be targeted for factoring out (as done here).

Note that several commonly used header files in include/*
directly include <linux/module.h> themselves (some 34 of them!)
The most commonly used ones of these will have to be made
independent of module.h before the full benefit of this change
can be realized.

We also transition THIS_MODULE from module.h to export.h,
since there are lots of files with subsystem structs that
in turn will have a struct module *owner and only be doing:

	.owner = THIS_MODULE;

and absolutely nothing else modular. So, we also want to have
the THIS_MODULE definition present in the lightweight header.

[1] https://lkml.org/lkml/2011/5/23/76Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>