[PATCH] powerpc: Only pad struct pt_regs when needed
From: Christophe Leroy <hidden>
Date: 2021-05-06 13:30:59
Also in:
lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), ptrace support, the rest · Maintainers:
Madhavan Srinivasan, Oleg Nesterov, Linus Torvalds
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