linux-kernel - [PATCH v2 3/7] arch/sparc: Define config parameter CPU_BIG

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Date:   Fri, 19 May 2017 18:16:57 -0600
From:   Babu Moger <babu.moger@...cle.com>
To:     davem@...emloft.net, peterz@...radead.org, mingo@...hat.com,
        arnd@...db.de
Cc:     babu.moger@...cle.com, shannon.nelson@...cle.com,
        haakon.bugge@...cle.com, steven.sistare@...cle.com,
        vijay.ac.kumar@...cle.com, jane.chu@...cle.com,
        sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org
Subject: [PATCH v2 3/7] arch/sparc: Define config parameter CPU_BIG_ENDIAN

Found this problem while enabling queued rwlock on SPARC.
The parameter CONFIG_CPU_BIG_ENDIAN is used to clear the
specific byte in qrwlock structure. Without this parameter,
we clear the wrong byte. Here is the code.

static inline u8 *__qrwlock_write_byte(struct qrwlock *lock)
 {
	return (u8 *)lock + 3 * IS_BUILTIN(CONFIG_CPU_BIG_ENDIAN);
 }

Define CPU_BIG_ENDIAN for SPARC to fix it.

Signed-off-by: Babu Moger <babu.moger@...cle.com>
Reviewed-by: Håkon Bugge <haakon.bugge@...cle.com>
Reviewed-by: Jane Chu <jane.chu@...cle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@...cle.com>
Reviewed-by: Vijay Kumar <vijay.ac.kumar@...cle.com>
---
 arch/sparc/Kconfig |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index a2ad946..0f5813b 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -91,6 +91,10 @@ config ARCH_DEFCONFIG
 config ARCH_PROC_KCORE_TEXT
 	def_bool y
 
+config CPU_BIG_ENDIAN
+	bool
+	default y if SPARC
+
 config ARCH_ATU
 	bool
 	default y if SPARC64
-- 
1.7.1