[PATCH] vsprintf: Do not break early boot with probing addresses

[David Laight]

> And I like Steven's "(fault)" idea.
> How about this:
> 
> 	if ptr < PAGE_SIZE		-> "(null)"
> 	if IS_ERR_VALUE(ptr)		-> "(fault)"
> 
> 	-ss

Or:
	if (ptr < PAGE_SIZE)
		return ptr ? "(null+)" : "(null)";
	if IS_ERR_VALUE(ptr)
		return "(errno)"

	David

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