Hi Maciej, On 30/01/15 09:25, Maciej W. Rozycki wrote: > On Thu, 15 Jan 2015, Aaro Koskinen wrote: > >> As printk() invocation can cause e.g. a TLB miss, printk() cannot be >> called before the exception handlers have been properly initialized. >> This can happen e.g. when netconsole has been loaded as a kernel module >> and the TLB table has been cleared when a CPU was offline. > > Hmm, why can a call to `printk' cause a TLB miss, what's so special about > this function? Does it use kernel mapped addresses for any purpose such > as `vmalloc'? It would be the fact netconsole (or whatever other console is in use) is built as a kernel module, memory for which is allocated from the vmalloc area. Cheers James
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