linux-kernel - [PATCH 2/3] nds32: Add 'HAVE_EFFICIENT_UNALIGNED

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Message-ID: <37e0f2b4530ba551a53a967ff4aa2e88aba2f486.1539654057.git.nickhu@andestech.com>
Date:   Thu, 18 Oct 2018 16:34:33 +0800
From:   Nickhu <nickhu@...estech.com>
To:     <greentime@...estech.com>, <linux-kernel@...r.kernel.org>,
        <arnd@...db.de>, <deanbo422@...il.com>, <zong@...estech.com>,
        <ebiederm@...ssion.com>
CC:     Nickhu <nickhu@...estech.com>, <green.hu@...il.com>
Subject: [PATCH 2/3] nds32: Add 'HAVE_EFFICIENT_UNALIGNED_ACCESS' config

According to my understanding, this config will optimize the code generate.
When there is an unaligned access happened, the load word instruction
still can be used if there is unaligned access support or the load byte
instruction is used. So this config need unaligned access support.

'HAVE_EFFICIENT_UNALIGNED_ACCESS' and 'HW_SUPPORT_UNALIGNMENT_ACCESS' are
default configs in nds32.

Signed-off-by: Nickhu <nickhu@...estech.com>
---
 arch/nds32/Kconfig.cpu | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/nds32/Kconfig.cpu b/arch/nds32/Kconfig.cpu
index b8c8984d1456..b8eecd0cde6b 100644
--- a/arch/nds32/Kconfig.cpu
+++ b/arch/nds32/Kconfig.cpu
@@ -111,8 +111,9 @@ config ALIGNMENT_TRAP
 
 config HW_SUPPORT_UNALIGNMENT_ACCESS
 	bool "Kernel support unaligned access handling by hw"
+	select HAVE_EFFICIENT_UNALIGNED_ACCESS
 	depends on !ALIGNMENT_TRAP
-	default n
+	default y
 	help
 	  Andes processors load/store world/half-word instructions can access
 	  unaligned memory locations without generating the Data Alignment
-- 
2.17.0