diff -u linux-4.15.0/arch/x86/include/asm/nospec-branch.h linux-4.15.0/arch/x86/include/asm/nospec-branch.h
--- linux-4.15.0/arch/x86/include/asm/nospec-branch.h
+++ linux-4.15.0/arch/x86/include/asm/nospec-branch.h
@@ -265,8 +265,8 @@
 {
 	asm volatile(ALTERNATIVE("", "wrmsr", %c[feature])
 		: : "c" (msr),
-		    "a" (val),
-		    "d" (val >> 32),
+		    "a" ((u32)val),
+		    "d" ((u32)(val >> 32)),
 		    [feature] "i" (feature)
 		: "memory");
 }
diff -u linux-4.15.0/debian.master/changelog linux-4.15.0/debian.master/changelog
--- linux-4.15.0/debian.master/changelog
+++ linux-4.15.0/debian.master/changelog
@@ -1,4 +1,4 @@
-linux (4.15.0-22.23) bionic; urgency=medium
+linux (4.15.0-22.24) bionic; urgency=medium
 
   * CVE-2018-3639 (powerpc)
     - powerpc/64s: Add support for a store forwarding barrier at kernel entry/exit
diff -u linux-4.15.0/debian/changelog linux-4.15.0/debian/changelog
--- linux-4.15.0/debian/changelog
+++ linux-4.15.0/debian/changelog
@@ -1,4 +1,4 @@
-linux (4.15.0-22.23) bionic; urgency=medium
+linux (4.15.0-22.24) bionic; urgency=medium
 
   * CVE-2018-3639 (powerpc)
     - powerpc/64s: Add support for a store forwarding barrier at kernel entry/exit