From: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
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@xxxxxxxxxx>
---
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
