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Message-Id: <20220414182252.758742-3-helgaas@kernel.org>
Date: Thu, 14 Apr 2022 13:22:51 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Hans de Goede <hdegoede@...hat.com>,
"Rafael J . Wysocki" <rjw@...ysocki.net>,
Borislav Petkov <bp@...en8.de>,
"H . Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>
Cc: Mika Westerberg <mika.westerberg@...ux.intel.com>,
Krzysztof Wilczyński <kw@...ux.com>,
Myron Stowe <myron.stowe@...hat.com>,
Juha-Pekka Heikkila <juhapekka.heikkila@...il.com>,
Benoit Grégoire <benoitg@...us.ca>,
Hui Wang <hui.wang@...onical.com>,
Kai-Heng Feng <kai.heng.feng@...onical.com>,
linux-acpi@...r.kernel.org, linux-pci@...r.kernel.org,
x86@...nel.org, linux-kernel@...r.kernel.org,
Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [PATCH v2 2/3] x86: Log resource clipping for E820 regions
From: Bjorn Helgaas <bhelgaas@...gle.com>
When remove_e820_regions() clips a resource because an E820 region overlaps
it, log a note in dmesg to add in debugging.
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
---
arch/x86/kernel/resource.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/arch/x86/kernel/resource.c b/arch/x86/kernel/resource.c
index 8ffe68437744..30d524adb012 100644
--- a/arch/x86/kernel/resource.c
+++ b/arch/x86/kernel/resource.c
@@ -1,5 +1,6 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/ioport.h>
+#include <linux/printk.h>
#include <asm/e820/api.h>
static void resource_clip(struct resource *res, resource_size_t start,
@@ -28,6 +29,7 @@ static void remove_e820_regions(struct resource *avail)
int i;
struct e820_entry *entry;
u64 e820_start, e820_end;
+ struct resource orig = *avail;
for (i = 0; i < e820_table->nr_entries; i++) {
entry = &e820_table->entries[i];
@@ -35,6 +37,11 @@ static void remove_e820_regions(struct resource *avail)
e820_end = entry->addr + entry->size - 1;
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);
+ orig = *avail;
+ }
}
}
--
2.25.1
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