nios2: page fault et.al. are *not* restartable syscalls...
make sure that ->orig_r2 is negative for everything except the syscalls. Fixes: 82ed08dd ("nios2: Exception handling") Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
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