* [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: linux-kernel, linuxppc-dev
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
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] powerpc: Only pad struct pt_regs when needed
2021-05-06 13:30 [PATCH] powerpc: Only pad struct pt_regs when needed Christophe Leroy
@ 2021-06-06 12:08 ` Michael Ellerman
0 siblings, 0 replies; 2+ messages in thread
From: Michael Ellerman @ 2021-06-06 12:08 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Christophe Leroy, Michael Ellerman,
Paul Mackerras
Cc: linuxppc-dev, linux-kernel
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
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