linux-kernel - [PATCH 2/2] x86/mtrr: make message for disabled MTRRs more descriptive

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Date:   Mon,  5 Dec 2022 09:04:33 +0100
From:   Juergen Gross <jgross@...e.com>
To:     linux-kernel@...r.kernel.org, x86@...nel.org
Cc:     kirill@...temov.name, Juergen Gross <jgross@...e.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH 2/2] x86/mtrr: make message for disabled MTRRs more descriptive

Instead of just saying "Disabled" when MTRRs are disabled for any
reason, tell what is disabled and why.

Signed-off-by: Juergen Gross <jgross@...e.com>
---
 arch/x86/kernel/cpu/mtrr/mtrr.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/mtrr/mtrr.c b/arch/x86/kernel/cpu/mtrr/mtrr.c
index 6432abccbf56..94d5739758ba 100644
--- a/arch/x86/kernel/cpu/mtrr/mtrr.c
+++ b/arch/x86/kernel/cpu/mtrr/mtrr.c
@@ -630,6 +630,7 @@ int __initdata changed_by_mtrr_cleanup;
 void __init mtrr_bp_init(void)
 {
 	u32 phys_addr;
+	const char *why = "(not available)";
 
 	phys_addr = 32;
 
@@ -705,12 +706,13 @@ void __init mtrr_bp_init(void)
 				changed_by_mtrr_cleanup = mtrr_cleanup(phys_addr);
 			} else {
 				mtrr_if = NULL;
+				why = "by BIOS";
 			}
 		}
 	}
 
 	if (!mtrr_enabled())
-		pr_info("Disabled\n");
+		pr_info("MTRRs disabled %s\n", why);
 }
 
 /**
-- 
2.35.3