[PATCH] x86-64: Handle reserve_bootmem_generic beyond end_pfn (5e58a02a) · Commits · 戴 / test

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:

Andi Kleen <ak@suse.de>

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);

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