linux-kernel - [PATCH v3 07/12] sh: add AT_HWCAP flag for J-Core cas.l instruction

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Date:	Wed, 25 May 2016 05:43:03 +0000
From:	Rich Felker <dalias@...c.org>
To:	linux-kernel@...r.kernel.org, linux-sh@...r.kernel.org
Cc:	Rich Felker <dalias@...c.org>,
	Yoshinori Sato <ysato@...rs.sourceforge.jp>
Subject: [PATCH v3 07/12] sh: add AT_HWCAP flag for J-Core cas.l instruction

Signed-off-by: Rich Felker <dalias@...c.org>
---
 arch/sh/include/uapi/asm/cpu-features.h | 1 +
 arch/sh/kernel/cpu/sh2/probe.c          | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/arch/sh/include/uapi/asm/cpu-features.h b/arch/sh/include/uapi/asm/cpu-features.h
index 694abe4..2f1bc85 100644
--- a/arch/sh/include/uapi/asm/cpu-features.h
+++ b/arch/sh/include/uapi/asm/cpu-features.h
@@ -22,5 +22,6 @@
 #define CPU_HAS_L2_CACHE	0x0080	/* Secondary cache / URAM */
 #define CPU_HAS_OP32		0x0100	/* 32-bit instruction support */
 #define CPU_HAS_PTEAEX		0x0200	/* PTE ASID Extension support */
+#define CPU_HAS_CAS_L		0x0400	/* cas.l atomic compare-and-swap */
 
 #endif /* __ASM_SH_CPU_FEATURES_H */
diff --git a/arch/sh/kernel/cpu/sh2/probe.c b/arch/sh/kernel/cpu/sh2/probe.c
index 3dd8187..665fcfb 100644
--- a/arch/sh/kernel/cpu/sh2/probe.c
+++ b/arch/sh/kernel/cpu/sh2/probe.c
@@ -54,6 +54,8 @@ void __ref cpu_probe(void)
 	boot_cpu_data.dcache.entry_shift	= 5;
 	boot_cpu_data.dcache.linesz		= 32;
 	boot_cpu_data.dcache.flags		= 0;
+
+	boot_cpu_data.flags |= CPU_HAS_CAS_L;
 #else
 	/*
 	 * SH-2 doesn't have separate caches
-- 
2.8.1