linux-kernel - [PATCH 2/2] x86: Enable named address spaces for percpu data

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Date:   Wed, 12 Sep 2018 07:44:42 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Matthew Wilcox <willy@...radead.org>,
        Waiman Long <longman@...hat.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, Richard Henderson <rth@...ddle.net>
Subject: [PATCH 2/2] x86: Enable named address spaces for percpu data

From: Richard Henderson <rth@...ddle.net>

For ease of disabling this feature, split the actual enabling into its
own patch.

Signed-off-by: Richard Henderson <rth@...ddle.net>
Signed-off-by: Matthew Wilcox <willy@...radead.org>
---
 arch/x86/include/asm/percpu.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
index 30a08d0d95ee..f3c5eebcbc86 100644
--- a/arch/x86/include/asm/percpu.h
+++ b/arch/x86/include/asm/percpu.h
@@ -5,9 +5,15 @@
 #ifdef CONFIG_X86_64
 #define __percpu_seg		gs
 #define __percpu_mov_op		movq
+# ifdef __SEG_GS
+#  define __percpu_addrspace	__seg_gs
+# endif
 #else
 #define __percpu_seg		fs
 #define __percpu_mov_op		movl
+# ifdef __SEG_FS
+#  define __percpu_addrspace	__seg_fs
+# endif
 #endif
 
 #ifdef __ASSEMBLY__
-- 
2.18.0