linux-kernel - [PATCH] mips: Realtek RTL: select NO_EXCEPT

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Message-Id: <20230115121922.6359-1-sander@svanheule.net>
Date:   Sun, 15 Jan 2023 13:19:22 +0100
From:   Sander Vanheule <sander@...nheule.net>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        linux-mips@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Sander Vanheule <sander@...nheule.net>,
        Olliver Schinagl <oliver@...inagl.nl>
Subject: [PATCH] mips: Realtek RTL: select NO_EXCEPT_FILL

The CPUs in these SoCs support MIPS32 R2, and allow ebase relocation.
Even if the default exception base of 0x80000000 is used, the
MIPS_GENERIC load address of 0x80100000 leaves sufficient space to not
need an extra 0x400 bytes of padding.

Suggested-by: Olliver Schinagl <oliver@...inagl.nl>
Signed-off-by: Sander Vanheule <sander@...nheule.net>
---
Olliver has suggested to make this change, in order to reduce the delta
with a fully generic MIPS kernel.
I hope the patch description makes sense, as I based the argumentation
on the behaviour of the code, and similar commits 7d6d28377783 ("MIPS:
Loongson64: select NO_EXCEPT_FILL") and dd54dedd947d ("MIPS: BCM47XX:
select NO_EXCEPT_FILL"). The change was tested on an RTL8380 and an
RTL8393 device, where it appears to work as expected.

Best,
Sander

 arch/mips/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 2db5c853992e..a8895aaa490e 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -627,6 +627,7 @@ config MACH_REALTEK_RTL
 	select IRQ_MIPS_CPU
 	select CEVT_R4K
 	select CSRC_R4K
+	select NO_EXCEPT_FILL
 	select SYS_HAS_CPU_MIPS32_R1
 	select SYS_HAS_CPU_MIPS32_R2
 	select SYS_SUPPORTS_32BIT_KERNEL
-- 
2.39.0