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Commit cd7d72bb authored by Ingo Molnar's avatar Ingo Molnar
Browse files

x86: improve MTRR trimming messages 



improve the MTTR trimming messages and also trigger a WARN_ON()
so that kerneloops.org can pick it up and categorize it.

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 9a1b62fe

arch/x86/kernel/cpu/mtrr/main.c

+7 −10
Original line number Diff line number Diff line
@@ -706,20 +706,17 @@ int __init mtrr_trim_uncached_memory(unsigned long end_pfn) 


	/* kvm/qemu doesn't have mtrr set right, don't trim them all */

	if (!highest_addr) {

		printk(KERN_WARNING "***************\n");

		printk(KERN_WARNING "**** WARNING: likely strange cpu\n");

		printk(KERN_WARNING "**** MTRRs all blank, cpu in qemu?\n");

		printk(KERN_WARNING "***************\n");

		printk(KERN_WARNING "WARNING: strange, CPU MTRRs all blank?\n");

		WARN_ON(1);

		return 0;

	}



	if ((highest_addr >> PAGE_SHIFT) < end_pfn) {

		printk(KERN_WARNING "***************\n");

		printk(KERN_WARNING "**** WARNING: likely BIOS bug\n");

		printk(KERN_WARNING "**** MTRRs don't cover all of "

		       "memory, trimmed %ld pages\n", end_pfn -

		       (highest_addr >> PAGE_SHIFT));

		printk(KERN_WARNING "***************\n");

		printk(KERN_WARNING "WARNING: BIOS bug: CPU MTRRs don't cover"

			" all of memory, losing %LdMB of RAM.\n",

			(((u64)end_pfn << PAGE_SHIFT) - highest_addr) >> 20);



		WARN_ON(1);



		printk(KERN_INFO "update e820 for mtrr\n");

		trim_start = highest_addr;