* [PATCH] powerpc: Only pad struct pt_regs when needed
@ 2021-05-06 13:30 Christophe Leroy
2021-06-06 12:08 ` Michael Ellerman
0 siblings, 1 reply; 2+ messages in thread
From: Christophe Leroy @ 2021-05-06 13:30 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman
Cc: linuxppc-dev, linux-kernel
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 <christophe.leroy@csgroup.eu>
---
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
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