[PATCH 05/17] xen/x86: address violations of MISRA C:2012 Directive 4.10

[Alessandro Zucchelli <alessandro.zucchelli@xxxxxxxxxxx>]

From: Simone Ballarin <simone.ballarin@xxxxxxxxxxx>

Add or move inclusion guards to address violations of
MISRA C:2012 Directive 4.10 ("Precautions shall be taken in order
to prevent the contents of a header file being included more than
once").

Inclusion guards must appear at the beginning of the headers
(comments are permitted anywhere).

Note that in x86_64/mmconfig.h we slightly deviate from the naming
convention in place: instead of having the inclusion guard as
X86_X86_64_MMCONFIG_H we shortened the directory prefix as X86_64 for
the sake of readability.

Mechanical change.

Signed-off-by: Simone Ballarin <simone.ballarin@xxxxxxxxxxx>
Signed-off-by: Maria Celeste Cesario <maria.celeste.cesario@xxxxxxxxxxx>
Signed-off-by: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
Signed-off-by: Alessandro Zucchelli <alessandro.zucchelli@xxxxxxxxxxx>

---
Changes in v4:
- modified inclusion guards and makefile.
Changes in v3:
- remove trailing underscores
- change inclusion guard name to adhere to the new standard
Changes in v2:
- remove extra blanks
- drop changes in C files

Note:
Changes in Makefile were not strictly necessary in v1 and a maintainer
asked to removing them since there was a deviation for generated headers.
Now, in v2, they are required since the deviation has been removed by
another patch of this series.
---
 xen/arch/x86/Makefile              | 9 +++++----
 xen/arch/x86/cpu/cpu.h             | 5 +++++
 xen/arch/x86/x86_64/mmconfig.h     | 5 +++++
 xen/arch/x86/x86_emulate/private.h | 5 +++++
 4 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/xen/arch/x86/Makefile b/xen/arch/x86/Makefile
index d902fb7acc..06d1bab43c 100644
--- a/xen/arch/x86/Makefile
+++ b/xen/arch/x86/Makefile
@@ -260,17 +260,18 @@ $(objtree)/arch/x86/include/asm/asm-macros.h: 
$(obj)/asm-macros.i $(src)/Makefil
        $(call filechk,asm-macros.h)
 
 define filechk_asm-macros.h
+       guard=$$(echo ASM_${SRCARCH}_ASM_MACROS_H | tr a-z A-Z);  \
+    echo '#ifndef $$guard'; \
+    echo '#define $$guard'; \
     echo '#if 0'; \
     echo '.if 0'; \
     echo '#endif'; \
-    echo '#ifndef __ASM_MACROS_H__'; \
-    echo '#define __ASM_MACROS_H__'; \
     echo 'asm ( ".include \"$@\"" );'; \
-    echo '#endif /* __ASM_MACROS_H__ */'; \
     echo '#if 0'; \
     echo '.endif'; \
     cat $<; \
-    echo '#endif'
+    echo '#endif'; \
+    echo '#endif /* $$guard */'
 endef
 
 $(obj)/efi.lds: AFLAGS-y += -DEFI
diff --git a/xen/arch/x86/cpu/cpu.h b/xen/arch/x86/cpu/cpu.h
index 8be65e975a..ee1c176ca4 100644
--- a/xen/arch/x86/cpu/cpu.h
+++ b/xen/arch/x86/cpu/cpu.h
@@ -1,3 +1,6 @@
+#ifndef X86_CPU_CPU_H
+#define X86_CPU_CPU_H
+
 /* attempt to consolidate cpu attributes */
 struct cpu_dev {
        void            (*c_early_init)(struct cpuinfo_x86 *c);
@@ -26,3 +29,5 @@ void amd_init_spectral_chicken(void);
 void detect_zen2_null_seg_behaviour(void);
 
 void intel_unlock_cpuid_leaves(struct cpuinfo_x86 *c);
+
+#endif /* X86_CPU_CPU_H */
diff --git a/xen/arch/x86/x86_64/mmconfig.h b/xen/arch/x86/x86_64/mmconfig.h
index 3da4b21e9b..722bf67975 100644
--- a/xen/arch/x86/x86_64/mmconfig.h
+++ b/xen/arch/x86/x86_64/mmconfig.h
@@ -5,6 +5,9 @@
  * Author: Allen Kay <allen.m.kay@xxxxxxxxx> - adapted from linux
  */
 
+#ifndef X86_64_MMCONFIG_H
+#define X86_64_MMCONFIG_H
+
 #define PCI_DEVICE_ID_INTEL_E7520_MCH    0x3590
 #define PCI_DEVICE_ID_INTEL_82945G_HB    0x2770
 
@@ -72,3 +75,5 @@ int pci_mmcfg_reserved(uint64_t address, unsigned int segment,
 int pci_mmcfg_arch_init(void);
 int pci_mmcfg_arch_enable(unsigned int idx);
 void pci_mmcfg_arch_disable(unsigned int idx);
+
+#endif /* X86_64_MMCONFIG_H */
diff --git a/xen/arch/x86/x86_emulate/private.h 
b/xen/arch/x86/x86_emulate/private.h
index 0fa26ba00a..8429b30b5e 100644
--- a/xen/arch/x86/x86_emulate/private.h
+++ b/xen/arch/x86/x86_emulate/private.h
@@ -6,6 +6,9 @@
  * Copyright (c) 2005-2007 XenSource Inc.
  */
 
+#ifndef X86_X86_EMULATE_PRIVATE_H
+#define X86_X86_EMULATE_PRIVATE_H
+
 #ifdef __XEN__
 
 # include <xen/bug.h>
@@ -836,3 +839,5 @@ static inline int read_ulong(enum x86_segment seg,
     *val = 0;
     return ops->read(seg, offset, val, bytes, ctxt);
 }
+
+#endif /* X86_X86_EMULATE_PRIVATE_H */
-- 
2.34.1