xen: don't include <xen/xen.h> from <asm/io.h> and <asm/dma-mapping.h>

Nothing Xen specific in these headers, which get included from a lot
of code in the kernel.  So prune the includes and move them to the
Xen-specific files that actually use them instead.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

arch/x86/include/asm/io.h

@@ -369,10 +369,6 @@ extern void __iomem *ioremap_wt(resource_size_t offset, unsigned long size);
 
 extern bool is_early_ioremap_ptep(pte_t *ptep);
 
-#ifdef CONFIG_XEN
-#include <xen/xen.h>
-#endif	/* CONFIG_XEN */
-
 #define IO_SPACE_LIMIT 0xffff
 
 #include <asm-generic/io.h>

arch/x86/include/asm/xen/events.h

@@ -2,6 +2,8 @@
 #ifndef _ASM_X86_XEN_EVENTS_H
 #define _ASM_X86_XEN_EVENTS_H
 
+#include <xen/xen.h>
+
 enum ipi_vector {
 	XEN_RESCHEDULE_VECTOR,
 	XEN_CALL_FUNCTION_VECTOR,

arch/x86/xen/enlighten.c

@@ -5,6 +5,7 @@
 #include <linux/kexec.h>
 #include <linux/slab.h>
 
+#include <xen/xen.h>
 #include <xen/features.h>
 #include <xen/page.h>
 #include <xen/interface/memory.h>

arch/x86/xen/enlighten_pvh.c

@@ -11,6 +11,7 @@
 #include <asm/xen/interface.h>
 #include <asm/xen/hypercall.h>
 
+#include <xen/xen.h>
 #include <xen/interface/memory.h>
 #include <xen/interface/hvm/start_info.h>
 

arch/x86/xen/platform-pci-unplug.c

@@ -23,6 +23,7 @@
 #include <linux/io.h>
 #include <linux/export.h>
 
+#include <xen/xen.h>
 #include <xen/platform_pci.h>
 #include "xen-ops.h"
 

arch/x86/xen/pmu.c

@@ -3,6 +3,7 @@
 #include <linux/interrupt.h>
 
 #include <asm/xen/hypercall.h>
+#include <xen/xen.h>
 #include <xen/page.h>
 #include <xen/interface/xen.h>
 #include <xen/interface/vcpu.h>