linux-kernel - [PATCH 4/5] x86/entry: remove unused sync

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Date:   Wed, 27 May 2020 07:31:06 +0000
From:   Lai Jiangshan <laijs@...ux.alibaba.com>
To:     linux-kernel@...r.kernel.org
Cc:     Lai Jiangshan <laijs@...ux.alibaba.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Zhenzhong Duan <zhenzhong.duan@...cle.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Jann Horn <jannh@...gle.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>
Subject: [PATCH 4/5] x86/entry: remove unused sync_regs()

No more users.

Signed-off-by: Lai Jiangshan <laijs@...ux.alibaba.com>
---
 arch/x86/include/asm/traps.h |  1 -
 arch/x86/kernel/traps.c      | 13 -------------
 2 files changed, 14 deletions(-)

diff --git a/arch/x86/include/asm/traps.h b/arch/x86/include/asm/traps.h
index f5a2e438a878..20b9db7a1d49 100644
--- a/arch/x86/include/asm/traps.h
+++ b/arch/x86/include/asm/traps.h
@@ -21,7 +21,6 @@ asmlinkage void xen_page_fault(void);
 dotraplinkage void do_page_fault(struct pt_regs *regs, unsigned long error_code, unsigned long address);
 
 #ifdef CONFIG_X86_64
-asmlinkage __visible notrace struct pt_regs *sync_regs(struct pt_regs *eregs);
 asmlinkage __visible notrace
 struct bad_iret_stack *fixup_bad_iret(struct bad_iret_stack *s);
 void __init trap_init(void);
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 3bef95934644..8291f84933ff 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -642,19 +642,6 @@ DEFINE_IDTENTRY_RAW(exc_int3)
 }
 
 #ifdef CONFIG_X86_64
-/*
- * Help handler running on a per-cpu (IST or entry trampoline) stack
- * to switch to the normal thread stack if the interrupted code was in
- * user mode. The actual stack switch is done in entry_64.S
- */
-asmlinkage __visible noinstr struct pt_regs *sync_regs(struct pt_regs *eregs)
-{
-	struct pt_regs *regs = (struct pt_regs *)this_cpu_read(cpu_current_top_of_stack) - 1;
-	if (regs != eregs)
-		*regs = *eregs;
-	return regs;
-}
-
 struct bad_iret_stack {
 	void *error_entry_ret;
 	struct pt_regs regs;
-- 
2.20.1