linux-kernel - [RFC PATCH 2/7] x86/kexec: Use named labels in swap_pages in relocate_kernel

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Message-ID: <20241103054019.3795299-3-dwmw2@infradead.org>
Date: Sun,  3 Nov 2024 05:35:27 +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 2/7] x86/kexec: Use named labels in swap_pages in relocate_kernel_64.S

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

Make the code a little more readable.

Signed-off-by: David Woodhouse <dwmw@...zon.co.uk>
---
 arch/x86/kernel/relocate_kernel_64.S | 30 ++++++++++++++--------------
 1 file changed, 15 insertions(+), 15 deletions(-)

diff --git a/arch/x86/kernel/relocate_kernel_64.S b/arch/x86/kernel/relocate_kernel_64.S
index c065806884f8..e607c0b7d70b 100644
--- a/arch/x86/kernel/relocate_kernel_64.S
+++ b/arch/x86/kernel/relocate_kernel_64.S
@@ -271,31 +271,31 @@ SYM_CODE_START_LOCAL_NOALIGN(swap_pages)
 	movq	%rdi, %rcx	/* Put the indirection_page in %rcx */
 	xorl	%edi, %edi
 	xorl	%esi, %esi
-	jmp	1f
+	jmp	.Lstart		/* Should start with an indirection record */
 
-0:	/* top, read another word for the indirection page */
+.Lloop:	/* top, read another word for the indirection page */
 
 	movq	(%rbx), %rcx
 	addq	$8,	%rbx
-1:
+.Lstart:
 	testb	$0x1,	%cl   /* is it a destination page? */
-	jz	2f
+	jz	.Lnotdest
 	movq	%rcx,	%rdi
 	andq	$0xfffffffffffff000, %rdi
-	jmp	0b
-2:
+	jmp	.Lloop
+.Lnotdest:
 	testb	$0x2,	%cl   /* is it an indirection page? */
-	jz	2f
+	jz	.Lnotind
 	movq	%rcx,   %rbx
 	andq	$0xfffffffffffff000, %rbx
-	jmp	0b
-2:
+	jmp	.Lloop
+.Lnotind:
 	testb	$0x4,	%cl   /* is it the done indicator? */
-	jz	2f
-	jmp	3f
-2:
+	jz	.Lnotdone
+	jmp	.Ldone
+.Lnotdone:
 	testb	$0x8,	%cl   /* is it the source indicator? */
-	jz	0b	      /* Ignore it otherwise */
+	jz	.Lloop	      /* Ignore it otherwise */
 	movq	%rcx,   %rsi  /* For ever source page do a copy */
 	andq	$0xfffffffffffff000, %rsi
 
@@ -320,8 +320,8 @@ SYM_CODE_START_LOCAL_NOALIGN(swap_pages)
 	rep ; movsq
 
 	lea	PAGE_SIZE(%rax), %rsi
-	jmp	0b
-3:
+	jmp	.Lloop
+.Ldone:
 	ANNOTATE_UNRET_SAFE
 	ret
 	int3
-- 
2.44.0