ARM wasn't raising a SIGBUS with a siginfo structure. Fix
__do_user_fault() to allow us to use it for SIGBUS conditions,
and arrange for the sigbus path to use this.
We need to prevent the siginfo code being called if we do
not have a user space context to call it, so consolidate the
ARM wasn't raising a SIGBUS with a siginfo structure. Fix
__do_user_fault() to allow us to use it for SIGBUS conditions,
and arrange for the sigbus path to use this.
We need to prevent the siginfo code being called if we do
not have a user space context to call it, so consolidate the
user_mode()
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