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 [thread overview]
Message-ID: <20190718174110.4635-2-namit@vmware.com> (raw)
In-Reply-To: <20190718174110.4635-1-namit@vmware.com>
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
next prev parent reply other threads:[~2019-07-19 1:03 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-18 17:41 [RFC 0/7] x86/percpu: Use segment qualifiers Nadav Amit
2019-07-18 17:41 ` Nadav Amit [this message]
2019-07-18 17:41 ` [RFC 2/7] x86/percpu: Use compiler segment prefix qualifier Nadav Amit
2019-07-18 17:41 ` [RFC 3/7] x86/percpu: Use C for percpu accesses when possible Nadav Amit
2019-07-22 20:52 ` Peter Zijlstra
2019-07-22 21:12 ` Nadav Amit
2019-07-18 17:41 ` [RFC 4/7] x86: Fix possible caching of current_task Nadav Amit
2019-07-18 17:41 ` [RFC 5/7] percpu: Assume preemption is disabled on per_cpu_ptr() Nadav Amit
2019-07-18 17:41 ` [RFC 6/7] x86/percpu: Optimized arch_raw_cpu_ptr() Nadav Amit
2019-07-18 17:41 ` [RFC 7/7] x86/current: Aggressive caching of current Nadav Amit
2019-07-22 21:07 ` Peter Zijlstra
2019-07-22 21:20 ` Nadav Amit
2019-07-22 21:09 ` [RFC 0/7] x86/percpu: Use segment qualifiers Peter Zijlstra
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