These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / arch / m68k / include / asm / linkage.h

diff --git a/kernel/arch/m68k/include/asm/linkage.h b/kernel/arch/m68k/include/asm/linkage.h
index 5a822bb..066e74f 100644 (file)
--- a/kernel/arch/m68k/include/asm/linkage.h
+++ b/kernel/arch/m68k/include/asm/linkage.h
@@ -4,4 +4,34 @@
 #define __ALIGN .align 4
 #define __ALIGN_STR ".align 4"
 
+/*
+ * Make sure the compiler doesn't do anything stupid with the
+ * arguments on the stack - they are owned by the *caller*, not
+ * the callee. This just fools gcc into not spilling into them,
+ * and keeps it from doing tailcall recursion and/or using the
+ * stack slots for temporaries, since they are live and "used"
+ * all the way to the end of the function.
+ */
+#define asmlinkage_protect(n, ret, args...) \
+       __asmlinkage_protect##n(ret, ##args)
+#define __asmlinkage_protect_n(ret, args...) \
+       __asm__ __volatile__ ("" : "=r" (ret) : "0" (ret), ##args)
+#define __asmlinkage_protect0(ret) \
+       __asmlinkage_protect_n(ret)
+#define __asmlinkage_protect1(ret, arg1) \
+       __asmlinkage_protect_n(ret, "m" (arg1))
+#define __asmlinkage_protect2(ret, arg1, arg2) \
+       __asmlinkage_protect_n(ret, "m" (arg1), "m" (arg2))
+#define __asmlinkage_protect3(ret, arg1, arg2, arg3) \
+       __asmlinkage_protect_n(ret, "m" (arg1), "m" (arg2), "m" (arg3))
+#define __asmlinkage_protect4(ret, arg1, arg2, arg3, arg4) \
+       __asmlinkage_protect_n(ret, "m" (arg1), "m" (arg2), "m" (arg3), \
+                             "m" (arg4))
+#define __asmlinkage_protect5(ret, arg1, arg2, arg3, arg4, arg5) \
+       __asmlinkage_protect_n(ret, "m" (arg1), "m" (arg2), "m" (arg3), \
+                             "m" (arg4), "m" (arg5))
+#define __asmlinkage_protect6(ret, arg1, arg2, arg3, arg4, arg5, arg6) \
+       __asmlinkage_protect_n(ret, "m" (arg1), "m" (arg2), "m" (arg3), \
+                             "m" (arg4), "m" (arg5), "m" (arg6))
+
 #endif