linux-kernel - [PATCH] kexec: Remove obsolete flag 'in_crash

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Date:	Tue,  6 Oct 2015 02:35:55 +0800
From:	Minfei Huang <mhuang@...hat.com>
To:	dzickus@...hat.com, cpw@....com, akpm@...ux-foundation.org,
	tglx@...utronix.de
Cc:	linux-kernel@...r.kernel.org, x86@...nel.org,
	kexec@...ts.infradead.org, mhuang@...hat.com,
	Minfei Huang <mnfhuang@...il.com>
Subject: [PATCH] kexec: Remove obsolete flag 'in_crash_kexec'

From: Minfei Huang <mnfhuang@...il.com>

Previously, UV NMI used 'in_crash_kexec' flag to be sure that we are in
kdump kernel or not in commit 5edd19af18a36a4e22c570b1b969179e0ca1fe4c
("x86, UV: Make kdump avoid stack dumps"). But this flags is removed in
commit 9c48f1c629ecfa114850c03f875c6691003214de ("x86, nmi: Wire up NMI
handlers to new routines").

Since it isn't used any more, remove it.

Signed-off-by: Minfei Huang <mnfhuang@...il.com>
---
 arch/x86/include/asm/kdebug.h | 6 ------
 arch/x86/kernel/crash.c       | 3 ---
 2 files changed, 9 deletions(-)

diff --git a/arch/x86/include/asm/kdebug.h b/arch/x86/include/asm/kdebug.h
index b130d59..e5f5dc9 100644
--- a/arch/x86/include/asm/kdebug.h
+++ b/arch/x86/include/asm/kdebug.h
@@ -29,11 +29,5 @@ extern void show_trace(struct task_struct *t, struct pt_regs *regs,
 extern void __show_regs(struct pt_regs *regs, int all);
 extern unsigned long oops_begin(void);
 extern void oops_end(unsigned long, struct pt_regs *, int signr);
-#ifdef CONFIG_KEXEC_CORE
-extern int in_crash_kexec;
-#else
-/* no crash dump is ever in progress if no crash kernel can be kexec'd */
-#define in_crash_kexec 0
-#endif
 
 #endif /* _ASM_X86_KDEBUG_H */
diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c
index 74ca2fe..2c1910f 100644
--- a/arch/x86/kernel/crash.c
+++ b/arch/x86/kernel/crash.c
@@ -75,8 +75,6 @@ struct crash_memmap_data {
 	unsigned int type;
 };
 
-int in_crash_kexec;
-
 /*
  * This is used to VMCLEAR all VMCSs loaded on the
  * processor. And when loading kvm_intel module, the
@@ -132,7 +130,6 @@ static void kdump_nmi_callback(int cpu, struct pt_regs *regs)
 
 static void kdump_nmi_shootdown_cpus(void)
 {
-	in_crash_kexec = 1;
 	nmi_shootdown_cpus(kdump_nmi_callback);
 
 	disable_local_APIC();
-- 
2.4.0

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