From: Miguel Bernal Marin <miguel.bernal.marin@linux.intel.com>
Date: Wed, 6 Oct 2021 00:13:18 -0500
Subject: ACPI: tools: fix compilation error
Patch-mainline: v5.15-rc7
Git-commit: 136f282028dae7d9dd68469b197aa2b36b410992
References: jsc#SLE-19223

When ACPI tools are compiled, the following error is showed:

   $ cd tools/power/acpi
   $ make
     DESCEND tools/acpidbg
     MKDIR    include
     CP       include
     CC       tools/acpidbg/acpidbg.o
   In file included from /home/linux/tools/power/acpi/include/acpi/platform/acenv.h:152,
                    from /home/linux/tools/power/acpi/include/acpi/acpi.h:22,
                    from acpidbg.c:9:
   /home/linux/tools/power/acpi/include/acpi/platform/acgcc.h:25:10: fatal error: linux/stdarg.h: No such file or directory
      29 | #include <linux/stdarg.h>
         |          ^~~~~~~~~~~~~~~~
   compilation terminated.

Use the ACPICA logic: just identify when it is used inside the kernel
or by an ACPI tool.

Fixes: c0891ac15f04 ("isystem: ship and use stdarg.h")
Signed-off-by: Miguel Bernal Marin <miguel.bernal.marin@linux.intel.com>
[ rjw: Changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Lee, Chun-Yi <jlee@suse.com>
---
 include/acpi/platform/acgcc.h |   11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

--- a/include/acpi/platform/acgcc.h
+++ b/include/acpi/platform/acgcc.h
@@ -22,10 +22,15 @@
 #define va_arg(v, l)            __builtin_va_arg(v, l)
 #define va_copy(d, s)           __builtin_va_copy(d, s)
 #else
+#ifdef __KERNEL__
 #include <linux/stdarg.h>
-#endif
-#endif
-
+#else
+/* Used to build acpi tools */
+#include <stdarg.h>
+#endif /* __KERNEL__ */
+#endif /* ACPI_USE_BUILTIN_STDARG */
+#endif /* ! va_arg */
+ 
 #define ACPI_INLINE             __inline__
 
 /* Function name is used for debug output. Non-ANSI, compiler-dependent */