linux-kernel - [tip: x86/cleanups] x86/kexec: Fix a comment of swap

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Message-ID: <172458943155.2215.14451665523819413189.tip-bot2@tip-bot2>
Date: Sun, 25 Aug 2024 12:37:11 -0000
From: "tip-bot2 for Kai Huang" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Kai Huang <kai.huang@...el.com>, Thomas Gleixner <tglx@...utronix.de>,
 "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: x86/cleanups] x86/kexec: Fix a comment of swap_pages() assembly

The following commit has been merged into the x86/cleanups branch of tip:

Commit-ID:     3c41ad39f179c0e41f585975eb6834cd14f286ec
Gitweb:        https://git.kernel.org/tip/3c41ad39f179c0e41f585975eb6834cd14f286ec
Author:        Kai Huang <kai.huang@...el.com>
AuthorDate:    Sun, 25 Aug 2024 20:18:05 +12:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Sun, 25 Aug 2024 14:29:39 +02:00

x86/kexec: Fix a comment of swap_pages() assembly

When relocate_kernel() gets called, %rdi holds 'indirection_page' and
%rsi holds 'page_list'.  And %rdi always holds 'indirection_page' when
swap_pages() is called.

Therefore the comment of the first line code of swap_pages()

	movq    %rdi, %rcx      /* Put the page_list in %rcx */

.. isn't correct because it actually moves the 'indirection_page' to
the %rcx.  Fix it.

Signed-off-by: Kai Huang <kai.huang@...el.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Link: https://lore.kernel.org/all/adafdfb1421c88efce04420fc9a996c0e2ca1b34.1724573384.git.kai.huang@intel.com

---
 arch/x86/kernel/relocate_kernel_64.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/relocate_kernel_64.S b/arch/x86/kernel/relocate_kernel_64.S
index 042c9a0..f7a3ca3 100644
--- a/arch/x86/kernel/relocate_kernel_64.S
+++ b/arch/x86/kernel/relocate_kernel_64.S
@@ -258,7 +258,7 @@ SYM_CODE_END(virtual_mapped)
 	/* Do the copies */
 SYM_CODE_START_LOCAL_NOALIGN(swap_pages)
 	UNWIND_HINT_END_OF_STACK
-	movq	%rdi, %rcx	/* Put the page_list in %rcx */
+	movq	%rdi, %rcx	/* Put the indirection_page in %rcx */
 	xorl	%edi, %edi
 	xorl	%esi, %esi
 	jmp	1f