[xen stable-4.17] libxl: allow building with old gcc again

[patchbot@xxxxxxx]

commit a982b33e5a6b3d6b8e85931a1b52e14db7bec20f
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Thu Aug 3 17:35:39 2023 +0200
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Tue Aug 8 16:02:17 2023 +0100

    libxl: allow building with old gcc again
    
    We can't use initializers of unnamed struct/union members just yet.
    
    Fixes: d638fe233cb3 ("libxl: use the cpuid feature names from 
cpufeatureset.h")
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    (cherry picked from commit 1aa5acbbec3f37bf38d78fa96d210053f8e8efd5)
---
 tools/libs/light/libxl_cpuid.c | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/tools/libs/light/libxl_cpuid.c b/tools/libs/light/libxl_cpuid.c
index 0630d342b0..849722541c 100644
--- a/tools/libs/light/libxl_cpuid.c
+++ b/tools/libs/light/libxl_cpuid.c
@@ -316,12 +316,16 @@ int libxl_cpuid_parse_config(libxl_cpuid_policy_list 
*policy, const char* str)
                 uint32_t index;
                 unsigned int reg;
             } msr;
-        };
+        } u;
     } feature_to_policy[] = {
 #define CPUID_ENTRY(l, s, r) \
-    { .type = FEAT_CPUID, .cpuid.leaf = l, .cpuid.subleaf = s, .cpuid.reg = r }
+    { .type = FEAT_CPUID, \
+      .u = { .cpuid.leaf = l, .cpuid.subleaf = s, .cpuid.reg = r } \
+    }
 #define MSR_ENTRY(i, r) \
-    { .type = FEAT_MSR, .msr.index = i, .msr.reg = r }
+    { .type = FEAT_MSR, \
+      .u = { .msr.index = i, .msr.reg = r } \
+    }
         CPUID_ENTRY(0x00000001, NA, CPUID_REG_EDX),
         CPUID_ENTRY(0x00000001, NA, CPUID_REG_ECX),
         CPUID_ENTRY(0x80000001, NA, CPUID_REG_EDX),
@@ -380,9 +384,9 @@ int libxl_cpuid_parse_config(libxl_cpuid_policy_list 
*policy, const char* str)
         struct cpuid_flags f;
 
         f.name = feat->name;
-        f.leaf = feature_to_policy[feat->bit / 32].cpuid.leaf;
-        f.subleaf = feature_to_policy[feat->bit / 32].cpuid.subleaf;
-        f.reg = feature_to_policy[feat->bit / 32].cpuid.reg;
+        f.leaf = feature_to_policy[feat->bit / 32].u.cpuid.leaf;
+        f.subleaf = feature_to_policy[feat->bit / 32].u.cpuid.subleaf;
+        f.reg = feature_to_policy[feat->bit / 32].u.cpuid.reg;
         f.bit = feat->bit % 32;
         f.length = 1;
 
@@ -393,10 +397,10 @@ int libxl_cpuid_parse_config(libxl_cpuid_policy_list 
*policy, const char* str)
     {
         unsigned int bit = feat->bit % 32;
 
-        if (feature_to_policy[feat->bit / 32].msr.reg == CPUID_REG_EDX)
+        if (feature_to_policy[feat->bit / 32].u.msr.reg == CPUID_REG_EDX)
             bit += 32;
 
-        return msr_add(policy, feature_to_policy[feat->bit / 32].msr.index,
+        return msr_add(policy, feature_to_policy[feat->bit / 32].u.msr.index,
                        bit, val);
     }
     }
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.17