x86: Don't include linux/irq.h from asm/hardirq.h

x86: Don't include linux/irq.h from asm/hardirq.h

The next patch in this series will have to make the definition of
irq_cpustat_t available to entering_irq().

Inclusion of asm/hardirq.h into asm/apic.h would cause circular header
dependencies like

  asm/smp.h
    asm/apic.h
      asm/hardirq.h
        linux/irq.h
          linux/topology.h
            linux/smp.h
              asm/smp.h

or

  linux/gfp.h
    linux/mmzone.h
      asm/mmzone.h
        asm/mmzone_64.h
          asm/smp.h
            asm/apic.h
              asm/hardirq.h
                linux/irq.h
                  linux/irqdesc.h
                    linux/kobject.h
                      linux/sysfs.h
                        linux/kernfs.h
                          linux/idr.h
                            linux/gfp.h

and others.

This causes compilation errors because of the header guards becoming
effective in the second inclusion: symbols/macros that had been defined
before wouldn't be available to intermediate headers in the #include chain
anymore.

A possible workaround would be to move the definition of irq_cpustat_t
into its own header and include that from both, asm/hardirq.h and
asm/apic.h.

However, this wouldn't solve the real problem, namely asm/harirq.h
unnecessarily pulling in all the linux/irq.h cruft: nothing in
asm/hardirq.h itself requires it. Also, note that there are some other
archs, like e.g. arm64, which don't have that #include in their
asm/hardirq.h.

Remove the linux/irq.h #include from x86' asm/hardirq.h.

Fix resulting compilation errors by adding appropriate #includes to *.c
files as needed.

Note that some of these *.c files could be cleaned up a bit wrt. to their
set of #includes, but that should better be done from separate patches, if
at all.

Signed-off-by: Nicolai Stange <nstange@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Orabug: 28220625
CVE: CVE-2018-3620

(cherry picked from commit 447ae316670230d7d29430e2cbf1f5db4f49d14c)

Signed-off-by: Mihai Carabas <mihai.carabas@oracle.com>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Conflicts:
	arch/x86/kernel/apic/vector.c
	drivers/gpu/drm/i915/i915_pmu.c
	drivers/pci/controller/pci-hyperv.c
	arch/x86/kernel/apic/apic.c
	arch/x86/kernel/apic/htirq.c
	arch/x86/kernel/fpu/core.c
	arch/x86/kernel/idt.c
	arch/x86/kernel/kprobes/core.c
	arch/x86/mm/fault.c
	arch/x86/mm/pti.c
	arch/x86/platform/intel-mid/device_libs/platform_mrfld_wdt.c
	drivers/gpu/drm/i915/intel_lpe_audio.c
	drivers/pci/host/pci-hyperv.c
Contextual: different content

In these files we included "linux/irq.h" just to preserve KABI:
	arch/x86/kernel/ftrace.c
	drivers/misc/ioc4.c
	drivers/pci/pci.c
	drivers/pci/pcie/aer/aerdrv_core.c
	drivers/pci/search.c
	drivers/pnp/resource.c
	fs/file_table.c
	mm/vmstat.c