linux-kernel - [RFC PATCH 7/7] [DO NOT MERGE] x86/kexec: enable DEBUG

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Message-ID: <20241103054019.3795299-8-dwmw2@infradead.org>
Date: Sun,  3 Nov 2024 05:35:32 +0000
From: David Woodhouse <dwmw2@...radead.org>
To: kexec@...ts.infradead.org
Cc: Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	David Woodhouse <dwmw@...zon.co.uk>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Kai Huang <kai.huang@...el.com>,
	Nikolay Borisov <nik.borisov@...e.com>,
	linux-kernel@...r.kernel.org,
	Simon Horman <horms@...nel.org>
Subject: [RFC PATCH 7/7] [DO NOT MERGE] x86/kexec: enable DEBUG

From: David Woodhouse <dwmw@...zon.co.uk>

Signed-off-by: David Woodhouse <dwmw@...zon.co.uk>
---
 arch/x86/kernel/relocate_kernel_64.S | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/kernel/relocate_kernel_64.S b/arch/x86/kernel/relocate_kernel_64.S
index 1c18cffe5229..bba37db6d437 100644
--- a/arch/x86/kernel/relocate_kernel_64.S
+++ b/arch/x86/kernel/relocate_kernel_64.S
@@ -14,6 +14,8 @@
 #include <asm/nospec-branch.h>
 #include <asm/unwind_hints.h>
 
+#define DEBUG
+
 /*
  * Must be relocatable PIC code callable as a C function, in particular
  * there must be a plain RET and not jump to return thunk.
@@ -195,6 +197,8 @@ SYM_CODE_START_LOCAL_NOALIGN(identity_mapped)
 	pushw	$0xff
 	lidt	(%rsp)
 	addq	$10, %rsp
+
+	int3
 #endif /* DEBUG */
 
 	/*
-- 
2.44.0