[xen staging] x86/PV: split a get_unsafe() invocation

[patchbot@xxxxxxx]

commit bcbef3bdbd091adedd33044a4260fa8dab21fb8a
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Fri May 22 08:19:54 2026 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri May 22 08:19:54 2026 +0200

    x86/PV: split a get_unsafe() invocation
    
    Misra C:2012 rule 13.6 takes issue with the gdt_ldt_desc_ptr() call
    appearing (deep) inside sizeof(), as used by get_unsafe().
    
    No functional change intended.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/pv/emulate.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/pv/emulate.c b/xen/arch/x86/pv/emulate.c
index a00d1c6c82..48052f9ac3 100644
--- a/xen/arch/x86/pv/emulate.c
+++ b/xen/arch/x86/pv/emulate.c
@@ -29,8 +29,14 @@ int pv_emul_read_descriptor(unsigned int sel, const struct 
vcpu *v,
           */
          ((sel & 4) && (sel >> 3) >= v->arch.pv.ldt_ents) )
         desc.b = desc.a = 0;
-    else if ( get_unsafe(desc, gdt_ldt_desc_ptr(sel)) )
-        return 0;
+    else
+    {
+        const seg_desc_t *pdesc = gdt_ldt_desc_ptr(sel);
+
+        if ( get_unsafe(desc, pdesc) )
+            return 0;
+    }
+
     if ( !insn_fetch )
         desc.b &= ~_SEGMENT_L;
 
--
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