linux-kernel - [PATCH v2] x86/kexec: use pr_err() instead of kexec

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Date: Wed, 20 Dec 2023 11:01:24 +0800
From: Yuntao Wang <ytcoode@...il.com>
To: akpm@...ux-foundation.org
Cc: bhe@...hat.com,
	bp@...en8.de,
	corbet@....net,
	dave.hansen@...ux.intel.com,
	ebiederm@...ssion.com,
	hpa@...or.com,
	kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	mingo@...hat.com,
	tglx@...utronix.de,
	x86@...nel.org,
	ytcoode@...il.com
Subject: [PATCH v2] x86/kexec: use pr_err() instead of kexec_dprintk() when an error occurs

When detecting an error, the current code uses kexec_dprintk() to output
log message. This is not quite appropriate as kexec_dprintk() is mainly
used for outputting debugging messages, rather than error messages.

Replace kexec_dprintk() with pr_err(). This also makes the output method
for this error log align with the output method for other error logs in
this function.

Additionally, the last return statement in set_page_address() is
unnecessary, remove it.

Signed-off-by: Yuntao Wang <ytcoode@...il.com>
---
v1 -> v2: Rewrite changelogs

 arch/x86/kernel/kexec-bzimage64.c | 2 +-
 mm/highmem.c                      | 2 --
 2 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/arch/x86/kernel/kexec-bzimage64.c b/arch/x86/kernel/kexec-bzimage64.c
index e9ae0eac6bf9..4a77d5dd4bce 100644
--- a/arch/x86/kernel/kexec-bzimage64.c
+++ b/arch/x86/kernel/kexec-bzimage64.c
@@ -429,7 +429,7 @@ static void *bzImage64_load(struct kimage *image, char *kernel,
 	 * command line. Make sure it does not overflow
 	 */
 	if (cmdline_len + MAX_ELFCOREHDR_STR_LEN > header->cmdline_size) {
-		kexec_dprintk("Appending elfcorehdr=<addr> to command line exceeds maximum allowed length\n");
+		pr_err("Appending elfcorehdr=<addr> to command line exceeds maximum allowed length\n");
 		return ERR_PTR(-EINVAL);
 	}
 
diff --git a/mm/highmem.c b/mm/highmem.c
index e19269093a93..bd48ba445dd4 100644
--- a/mm/highmem.c
+++ b/mm/highmem.c
@@ -799,8 +799,6 @@ void set_page_address(struct page *page, void *virtual)
 		}
 		spin_unlock_irqrestore(&pas->lock, flags);
 	}
-
-	return;
 }
 
 void __init page_address_init(void)
-- 
2.43.0