linux-kernel - [PATCH v2 3/4] x86/PCI: Tidy E820 removal messages

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Date:   Thu,  8 Dec 2022 13:03:40 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     linux-pci@...r.kernel.org
Cc:     Hans de Goede <hdegoede@...hat.com>,
        Florent DELAHAYE <kernelorg@...ead.fr>,
        Konrad J Hambrick <kjhambrick@...il.com>,
        Matt Hansen <2lprbe78@...k.com>,
        Benoit Grégoire <benoitg@...us.ca>,
        Nicholas Johnson <nicholas.johnson-opensource@...look.com.au>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Werner Sembach <wse@...edocomputers.com>,
        mumblingdrunkard@...tonmail.com, linux-kernel@...r.kernel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [PATCH v2 3/4] x86/PCI: Tidy E820 removal messages

From: Bjorn Helgaas <bhelgaas@...gle.com>

These messages:

  clipped [mem size 0x00000000 64bit] to [mem size 0xfffffffffffa0000 64bit] for e820 entry [mem 0x0009f000-0x000fffff]

aren't as useful as they could be because (a) the resource is often
IORESOURCE_UNSET, so we print the size instead of the start/end and (b) we
print the available resource even if it is empty after removing the E820
entry.

Print the available space by hand to avoid the IORESOURCE_UNSET problem and
only if it's non-empty.  No functional change intended.

Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Hans de Goede <hdegoede@...hat.com>
---
 arch/x86/kernel/resource.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/resource.c b/arch/x86/kernel/resource.c
index bba1abd05bfe..7543a13c8520 100644
--- a/arch/x86/kernel/resource.c
+++ b/arch/x86/kernel/resource.c
@@ -42,8 +42,12 @@ static void remove_e820_regions(struct resource *avail)
 
 		resource_clip(avail, e820_start, e820_end);
 		if (orig.start != avail->start || orig.end != avail->end) {
-			pr_info("clipped %pR to %pR for e820 entry [mem %#010Lx-%#010Lx]\n",
-				 &orig, avail, e820_start, e820_end);
+			pr_info("resource: avoiding allocation from e820 entry [mem %#010Lx-%#010Lx]\n",
+				e820_start, e820_end);
+			if (avail->end > avail->start)
+				pr_info("resource: remaining [mem %#010llx-%#010llx] available\n",
+					(unsigned long long) avail->start,
+					(unsigned long long) avail->end);
 			orig = *avail;
 		}
 	}
-- 
2.25.1