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From:   Nadav Amit <namit@vmware.com>
To:     Peter Zijlstra <peterz@infradead.org>
Cc:     Andy Lutomirski <luto@kernel.org>, x86@kernel.org,
        linux-kernel@vger.kernel.org,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Nadav Amit <namit@vmware.com>
Subject: [RFC 1/7] compiler: Report x86 segment support
Date:   Thu, 18 Jul 2019 10:41:04 -0700
Message-Id: <20190718174110.4635-2-namit@vmware.com>
In-Reply-To: <20190718174110.4635-1-namit@vmware.com>
References: <20190718174110.4635-1-namit@vmware.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

GCC v6+ supports x86 segment qualifiers (__seg_gs and __seg_fs). Define
COMPILER_HAS_X86_SEG_SUPPORT when it is supported.

Signed-off-by: Nadav Amit <namit@vmware.com>
---
 include/linux/compiler-gcc.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
index e8579412ad21..787b5971e41f 100644
--- a/include/linux/compiler-gcc.h
+++ b/include/linux/compiler-gcc.h
@@ -149,6 +149,10 @@
 #define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
 #endif
 
+#if GCC_VERSION >= 60000
+#define COMPILER_HAS_X86_SEG_SUPPORT 1
+#endif
+
 /*
  * Turn individual warnings and errors on and off locally, depending
  * on version.
-- 
2.17.1