linux-kernel - [PATCH v2 1/4] x86/PCI: Show the physical address of the $PIR table

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Message-ID: <alpine.DEB.2.21.2201020151450.56863@angie.orcam.me.uk>
Date:   Sun, 2 Jan 2022 23:24:23 +0000 (GMT)
From:   "Maciej W. Rozycki" <macro@...am.me.uk>
To:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>
cc:     x86@...nel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/4] x86/PCI: Show the physical address of the $PIR
 table

It makes no sense to hide the address of the $PIR table in a debug dump:

PCI: Interrupt Routing Table found at 0x(ptrval)

let alone print its virtual address, given that this is a BIOS entity at 
a fixed location in the system's memory map.  Show the physical address 
instead then, e.g.:

PCI: Interrupt Routing Table found at 0xfde10

Signed-off-by: Maciej W. Rozycki <macro@...am.me.uk>
---
No change from v1.
---
 arch/x86/pci/irq.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

linux-x86-debug-pirq-addr.diff
Index: linux-macro/arch/x86/pci/irq.c
===================================================================
--- linux-macro.orig/arch/x86/pci/irq.c
+++ linux-macro/arch/x86/pci/irq.c
@@ -84,8 +84,8 @@ static inline struct irq_routing_table *
 	for (i = 0; i < rt->size; i++)
 		sum += addr[i];
 	if (!sum) {
-		DBG(KERN_DEBUG "PCI: Interrupt Routing Table found at 0x%p\n",
-			rt);
+		DBG(KERN_DEBUG "PCI: Interrupt Routing Table found at 0x%lx\n",
+		    __pa(rt));
 		return rt;
 	}
 	return NULL;