linux-kernel - [PATCH V5 12/50] x86/traps: Move the declaration of native_irq_return

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Message-Id: <20211110115736.3776-13-jiangshanlai@gmail.com>
Date:   Wed, 10 Nov 2021 19:56:58 +0800
From:   Lai Jiangshan <jiangshanlai@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     x86@...nel.org, Lai Jiangshan <laijs@...ux.alibaba.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "Chang S. Bae" <chang.seok.bae@...el.com>,
        Jan Kiszka <jan.kiszka@...mens.com>,
        Joerg Roedel <jroedel@...e.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Sean Christopherson <seanjc@...gle.com>
Subject: [PATCH V5 12/50] x86/traps: Move the declaration of native_irq_return_iret into proto.h

From: Lai Jiangshan <laijs@...ux.alibaba.com>

The declaration of native_irq_return_iret is used in exc_double_fault()
only by now.  But it will be used in other place later, so the declaration
is moved to a header file for preparation.

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

diff --git a/arch/x86/include/asm/proto.h b/arch/x86/include/asm/proto.h
index feed36d44d04..33ae276c8b34 100644
--- a/arch/x86/include/asm/proto.h
+++ b/arch/x86/include/asm/proto.h
@@ -13,6 +13,7 @@ void syscall_init(void);
 #ifdef CONFIG_X86_64
 void entry_SYSCALL_64(void);
 void entry_SYSCALL_64_safe_stack(void);
+extern unsigned char native_irq_return_iret[];
 long do_arch_prctl_64(struct task_struct *task, int option, unsigned long arg2);
 #endif
 
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index c9d566dcf89a..1be5c1edad6b 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -359,8 +359,6 @@ DEFINE_IDTENTRY_DF(exc_double_fault)
 #endif
 
 #ifdef CONFIG_X86_ESPFIX64
-	extern unsigned char native_irq_return_iret[];
-
 	/*
 	 * If IRET takes a non-IST fault on the espfix64 stack, then we
 	 * end up promoting it to a doublefault.  In that case, take
-- 
2.19.1.6.gb485710b