parisc: fix livelock in uaccess
parisc equivalent of 26178ec1 "x86: mm: consolidate VM_FAULT_RETRY handling" If e.g. get_user() triggers a page fault and a fatal signal is caught, we might end up with handle_mm_fault() returning VM_FAULT_RETRY and not doing anything to page tables. In such case we must *not* return to the faulting insn - that would repeat the entire thing without making any progress; what we need instead is to treat that as failed (user) memory access. Tested-by:Helge Deller <deller@gmx.de> Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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