linux-kernel - [PATCH v2 04/10] x86_64,vdso: Remove jiffies from the vvar page

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Message-Id: <1c2b5db6fbdb5751feff63b7b87c574a6bc650e1.1404164803.git.luto@amacapital.net>
Date:	Mon, 30 Jun 2014 14:53:15 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	x86@...nel.org, hpa@...or.org
Cc:	linux-kernel@...r.kernel.org, Andy Lutomirski <luto@...capital.net>
Subject: [PATCH v2 04/10] x86_64,vdso: Remove jiffies from the vvar page

I think that the jiffies vvar was once used for the vgetcpu cache.
That code is long gone, so let's just make jiffies be a normal
variable.

Signed-off-by: Andy Lutomirski <luto@...capital.net>
---
 arch/x86/include/asm/vvar.h | 1 -
 arch/x86/kernel/time.c      | 2 +-
 arch/x86/vdso/vgetcpu.c     | 1 -
 3 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/vvar.h b/arch/x86/include/asm/vvar.h
index 5d2b9ad..5f6d407 100644
--- a/arch/x86/include/asm/vvar.h
+++ b/arch/x86/include/asm/vvar.h
@@ -44,7 +44,6 @@ extern char __vvar_page;
 
 /* DECLARE_VVAR(offset, type, name) */
 
-DECLARE_VVAR(0, volatile unsigned long, jiffies)
 DECLARE_VVAR(16, int, vgetcpu_mode)
 DECLARE_VVAR(128, struct vsyscall_gtod_data, vsyscall_gtod_data)
 
diff --git a/arch/x86/kernel/time.c b/arch/x86/kernel/time.c
index bf7ef5c..822773b 100644
--- a/arch/x86/kernel/time.c
+++ b/arch/x86/kernel/time.c
@@ -23,7 +23,7 @@
 #include <asm/time.h>
 
 #ifdef CONFIG_X86_64
-__visible DEFINE_VVAR(volatile unsigned long, jiffies) = INITIAL_JIFFIES;
+__visible volatile unsigned long jiffies __cacheline_aligned = INITIAL_JIFFIES;
 #endif
 
 unsigned long profile_pc(struct pt_regs *regs)
diff --git a/arch/x86/vdso/vgetcpu.c b/arch/x86/vdso/vgetcpu.c
index 2f94b03..add1d98 100644
--- a/arch/x86/vdso/vgetcpu.c
+++ b/arch/x86/vdso/vgetcpu.c
@@ -7,7 +7,6 @@
 
 #include <linux/kernel.h>
 #include <linux/getcpu.h>
-#include <linux/jiffies.h>
 #include <linux/time.h>
 #include <asm/vsyscall.h>
 #include <asm/vgtod.h>
-- 
1.9.3

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