linux-kernel - [PATCH] arm64: Extend pr_crit message on invalid FDT

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Message-ID: <20250423084851.26449-1-bsz@amazon.de>
Date: Wed, 23 Apr 2025 08:48:51 +0000
From: Bartosz Szczepanek <bsz@...zon.de>
To: Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>
CC: <nh-open-source@...zon.com>, Bartosz Szczepanek <bsz@...zon.de>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] arm64: Extend pr_crit message on invalid FDT

Log size in addition to physical and virtual addresses. It has potential
to be helpful when DTB exceeds the 2 MB limit.

Initialize size to 0 to print out sane value if fixmap_remap_fdt fails
without setting the size.

Signed-off-by: Bartosz Szczepanek <bsz@...zon.de>
---
 arch/arm64/kernel/setup.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 85104587f849..77c7926a4df6 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -169,7 +169,7 @@ static void __init smp_build_mpidr_hash(void)
 
 static void __init setup_machine_fdt(phys_addr_t dt_phys)
 {
-	int size;
+	int size = 0;
 	void *dt_virt = fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL);
 	const char *name;
 
@@ -182,10 +182,10 @@ static void __init setup_machine_fdt(phys_addr_t dt_phys)
 	 */
 	if (!early_init_dt_scan(dt_virt, dt_phys)) {
 		pr_crit("\n"
-			"Error: invalid device tree blob at physical address %pa (virtual address 0x%px)\n"
-			"The dtb must be 8-byte aligned and must not exceed 2 MB in size\n"
-			"\nPlease check your bootloader.",
-			&dt_phys, dt_virt);
+			"Error: invalid device tree blob: PA=%pa, VA=%px, size=%d bytes\n"
+			"The dtb must be 8-byte aligned and must not exceed 2 MB in size.\n"
+			"\nPlease check your bootloader.\n",
+			&dt_phys, dt_virt, size);
 
 		/*
 		 * Note that in this _really_ early stage we cannot even BUG()
-- 
2.47.1