linux-kernel - [PATCH v2] ACPI:PRM: Reduce unnecessary printing to avoid the

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Message-ID: <20250512010620.142155-1-qiyuzhu2@amd.com>
Date: Mon, 12 May 2025 01:06:20 +0000
From: Zhu Qiyu <qiyuzhu2@....com>
To: <rafael@...nel.org>
CC: <lenb@...nel.org>, <linux-acpi@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <qiyuzhu2@....com>
Subject: [PATCH v2] ACPI:PRM: Reduce unnecessary printing to avoid the

Commit 088984c8d54c ("ACPI: PRM: Find EFI_MEMORY_RUNTIME block for PRM
handler and context") introduces non-essential printing "Failed
to find VA for GUID: 7626C6AE-F973-429C-A91C-107D7BE298B0, PA: 0x0"
which causes unnecessary worry for regular users.

Refer to PRM Spec Section 4.1.2[1], both static data buffer address
and ACPI parameter buffer address may be NULL if they are not needed.
So there is no need to print out "Failed to find VA ... " to intimidate
regular users.

Link: https://uefi.org/sites/default/files/resources/Platform%20Runtime%20Mechanism%20-%20with%20legal%20notice.pdf # [1]

Signed-off-by: Zhu Qiyu <qiyuzhu2@....com>
---

Previous versions can be found at:
v1: https://lore.kernel.org/linux-acpi/CAJZ5v0hv0WKd-SXFhUgYs-Zpc+-PsSNOBu0r7L5TzJWgddtsKA@mail.gmail.com/t/#u

Changes in v2:
 - Reduce the code changes.

 drivers/acpi/prmt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/acpi/prmt.c b/drivers/acpi/prmt.c
index e549914a636c..28a9930267a3 100644
--- a/drivers/acpi/prmt.c
+++ b/drivers/acpi/prmt.c
@@ -85,7 +85,7 @@ static u64 efi_pa_va_lookup(efi_guid_t *guid, u64 pa)
 		}
 	}
 
-	pr_warn("Failed to find VA for GUID: %pUL, PA: 0x%llx", guid, pa);
+	pr_info("VA for GUID: %pUL, PA: 0x%llx not found\n", guid, pa);
 
 	return 0;
 }

base-commit: 92a09c47464d040866cf2b4cd052bc60555185fb
-- 
2.43.0