linux-kernel - [PATCH] x86: Unify definition of jiffies

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Date:   Sun,  7 Jan 2018 09:46:38 -0500
From:   Zhihui Zhang <zzhsuny@...il.com>
To:     tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        linux-kernel@...r.kernel.org
Subject: [PATCH] x86: Unify definition of jiffies

jiffies_64 is always defined in file kernel/time/timer.c. Thus, we
can unify definition of jiffies and make it less confusing. This
only affects 64-bit platforms.

Signed-off-by: Zhihui Zhang <zzhsuny@...il.com>
---
 arch/x86/kernel/time.c        | 4 ----
 arch/x86/kernel/vmlinux.lds.S | 4 ++--
 2 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/time.c b/arch/x86/kernel/time.c
index 749d189..2fedb33 100644
--- a/arch/x86/kernel/time.c
+++ b/arch/x86/kernel/time.c
@@ -23,10 +23,6 @@
 #include <asm/hpet.h>
 #include <asm/time.h>
 
-#ifdef CONFIG_X86_64
-__visible volatile unsigned long jiffies __cacheline_aligned = INITIAL_JIFFIES;
-#endif
-
 unsigned long profile_pc(struct pt_regs *regs)
 {
 	unsigned long pc = instruction_pointer(regs);
diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index 1e413a93..940c190 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -36,13 +36,13 @@ OUTPUT_FORMAT(CONFIG_OUTPUT_FORMAT, CONFIG_OUTPUT_FORMAT, CONFIG_OUTPUT_FORMAT)
 #ifdef CONFIG_X86_32
 OUTPUT_ARCH(i386)
 ENTRY(phys_startup_32)
-jiffies = jiffies_64;
 #else
 OUTPUT_ARCH(i386:x86-64)
 ENTRY(phys_startup_64)
-jiffies_64 = jiffies;
 #endif
 
+jiffies = jiffies_64;
+
 #if defined(CONFIG_X86_64)
 /*
  * On 64-bit, align RODATA to 2MB so we retain large page mappings for
-- 
2.7.4