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Commit 5e58a02a authored by Andi Kleen's avatar Andi Kleen Committed by Andi Kleen
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[PATCH] x86-64: Handle reserve_bootmem_generic beyond end_pfn 



This can happen on kexec kernels with some configurations, in particularly
on Unisys ES7000 systems.

Analysis by Amul Shah

Cc: Amul Shah <amul.shah@unisys.com>

Signed-off-by: default avatarAndi Kleen <ak@suse.de>
parent 51d67a48

arch/x86_64/mm/init.c

+14 −1
Original line number Diff line number Diff line
@@ -655,9 +655,22 @@ void free_initrd_mem(unsigned long start, unsigned long end) 


void __init reserve_bootmem_generic(unsigned long phys, unsigned len) 

{ 

	/* Should check here against the e820 map to avoid double free */ 

#ifdef CONFIG_NUMA

	int nid = phys_to_nid(phys);

#endif

	unsigned long pfn = phys >> PAGE_SHIFT;

	if (pfn >= end_pfn) {

		/* This can happen with kdump kernels when accessing firmware

		   tables. */

		if (pfn < end_pfn_map)

			return;

		printk(KERN_ERR "reserve_bootmem: illegal reserve %lx %u\n",

				phys, len);

		return;

	}



	/* Should check here against the e820 map to avoid double free */

#ifdef CONFIG_NUMA

  	reserve_bootmem_node(NODE_DATA(nid), phys, len);

#else       		

	reserve_bootmem(phys, len);