[PATCH] 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 <redacted>
---
 arch/powerpc/include/asm/ptrace.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/ptrace.h b/arch/powerpc/include/asm/ptrace.h
index 9c9ab2746168..4fd3a3bd5272 100644
--- 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
 

-- 
2.25.0

On Thu, 6 May 2021 13:30:51 +0000 (UTC), Christophe Leroy wrote:

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.

Applied to powerpc/next.

[1/1] powerpc: Only pad struct pt_regs when needed
      https://git.kernel.org/powerpc/c/b09049c516af90d4b6643b5d0d2549cd01539086

cheers