[xen master] x86/efi: enable MS ABI attribute on clang

[patchbot@xxxxxxx]

commit 92f5ffa58d188c9f9a9f1bcdccb6d6348d9df612
Author:     Roger Pau Monné <roger.pau@xxxxxxxxxx>
AuthorDate: Thu Feb 4 14:02:32 2021 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Feb 4 14:02:32 2021 +0100

    x86/efi: enable MS ABI attribute on clang
    
    Or else the EFI service calls will use the wrong calling convention.
    
    The __ms_abi__ attribute is available on all supported versions of
    clang. Add a specific Clang check because the GCC version reported by
    Clang is below the required 4.4 to use the __ms_abi__ attribute.
    
    Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Ian Jackson <iwj@xxxxxxxxxxxxxx>
    Release-Acked-by: Ian Jackson <iwj@xxxxxxxxxxxxxx>
---
 xen/include/asm-x86/x86_64/efibind.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/include/asm-x86/x86_64/efibind.h 
b/xen/include/asm-x86/x86_64/efibind.h
index b013db175d..ddcfae07ec 100644
--- a/xen/include/asm-x86/x86_64/efibind.h
+++ b/xen/include/asm-x86/x86_64/efibind.h
@@ -172,7 +172,7 @@ typedef uint64_t   UINTN;
 #ifndef EFIAPI                  // Forces EFI calling conventions reguardless 
of compiler options
     #ifdef _MSC_EXTENSIONS
         #define EFIAPI __cdecl  // Force C calling convention for Microsoft C 
compiler
-    #elif __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4)
+    #elif __clang__ || __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4)
         #define EFIAPI __attribute__((__ms_abi__))  // Force Microsoft ABI
     #else
         #define EFIAPI          // Substitute expresion to force C calling 
convention
--
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