powerpc: Only pad struct pt_regs when needed

If neither KUAP nor PPC64 is selected, there is nothing in the second union of struct pt_regs, so the alignment padding is waste of memory. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/d536bbc46094f66b24d3017343be25164f232933.1620307840.git.christophe.leroy@csgroup.eu
mrcsosa · May 17, 2021 · b09049c · b09049c
1 parent 8af8d72
commit b09049c
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/arch/powerpc/include/asm/ptrace.h b/arch/powerpc/include/asm/ptrace.h
@@ -47,7 +47,7 @@ struct pt_regs
 			unsigned long result;
 		};
 	};
-
+#if defined(CONFIG_PPC64) || defined(CONFIG_PPC_KUAP)
 	union {
 		struct {
 #ifdef CONFIG_PPC64
@@ -67,6 +67,7 @@ struct pt_regs
 		};
 		unsigned long __pad[4];	/* Maintain 16 byte interrupt stack alignment */
 	};
+#endif
 };
 #endif