From: David Woodhouse <dwmw@amazon.co.uk>
Date: Thu, 5 Dec 2024 15:05:09 +0000 (+0000)
Subject: x86/kexec: Use named labels in swap_pages in relocate_kernel_64.S
X-Git-Tag: v6.14-rc1~119^2~24
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=46d4e205e22c89841552b05663d34e57e9a66611;p=thirdparty%2Flinux.git

x86/kexec: Use named labels in swap_pages in relocate_kernel_64.S

Make the code a little more readable.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Kai Huang <kai.huang@intel.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Link: https://lore.kernel.org/r/20241205153343.3275139-4-dwmw2@infradead.org
---

diff --git a/arch/x86/kernel/relocate_kernel_64.S b/arch/x86/kernel/relocate_kernel_64.S
index 92478e2e254f4..fea650f926066 100644
--- a/arch/x86/kernel/relocate_kernel_64.S
+++ b/arch/x86/kernel/relocate_kernel_64.S
@@ -279,31 +279,31 @@ 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
 
@@ -328,8 +328,8 @@ 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