Commit 31bf0f43 authored by Bjorn Helgaas's avatar Bjorn Helgaas
Browse files

x86: Log resource clipping for E820 regions 



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: default avatarBjorn Helgaas <bhelgaas@google.com>
parent 93d256cd

arch/x86/kernel/resource.c

+7 −0
Original line number Diff line number Diff line 
// 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;

		}

	}

}