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@@ -84,6 +84,17 @@ static int __init early_parse_mem(char *p)
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memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
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size = memparse(p, &p);
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+
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+ if (size > __MEMORY_SIZE) {
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+ static char msg[] __initdata = KERN_ERR
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+ "Using mem= to increase the size of kernel memory "
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+ "is not allowed.\n"
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+ " Recompile the kernel with the correct value for "
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+ "CONFIG_MEMORY_SIZE.\n";
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+ printk(msg);
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+ return 0;
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+ }
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+
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memory_end = memory_start + size;
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return 0;
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