[Xen-devel] [PATCH 2/2] x86: fix indirect thunk usage of CONFIG_INDIRECT_THUNK

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

When indirect_thunk_asm.h is instantiated directly into assembly files
CONFIG_INDIRECT_THUNK might not be defined, and thus using .if against
it is wrong.

Add a check to define CONFIG_INDIRECT_THUNK to 0 if not defined, so
that using .if CONFIG_INDIRECT_THUNK is always correct.

This suppresses the following clang error:

<instantiation>:8:9: error: expected absolute expression
    .if CONFIG_INDIRECT_THUNK == 1
        ^
<instantiation>:1:1: note: while in macro instantiation
INDIRECT_BRANCH call %rdx
^
entry.S:589:9: note: while in macro instantiation
        INDIRECT_CALL %rdx
        ^

Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/include/asm-x86/asm_defns.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/xen/include/asm-x86/asm_defns.h b/xen/include/asm-x86/asm_defns.h
index 627a544326..f7e53627ff 100644
--- a/xen/include/asm-x86/asm_defns.h
+++ b/xen/include/asm-x86/asm_defns.h
@@ -14,6 +14,9 @@
 #include <asm/alternative.h>
 
 #ifdef __ASSEMBLY__
+# ifndef CONFIG_INDIRECT_THUNK
+#  define CONFIG_INDIRECT_THUNK 0
+# endif
 # include <asm/indirect_thunk_asm.h>
 #else
 #define INCLUDE_INDIRECT_THUNK                                  \
-- 
2.15.1


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