linux-kernel - [PATCH 1/7] compiler: Report x86 segment support

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Message-Id: <20190823224424.15296-2-namit@vmware.com>
Date:   Fri, 23 Aug 2019 15:44:18 -0700
From:   Nadav Amit <namit@...are.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Thomas Garnier <thgarnie@...omium.org>,
        Ingo Molnar <mingo@...hat.com>, Nadav Amit <namit@...are.com>
Subject: [PATCH 1/7] compiler: Report x86 segment support

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@...are.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 d7ee4c6bad48..5967590a18c6 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