[PATCH] ppc64: remove get_users in backtrace code
From: Anton Blanchard <anton@samba.org> The might_sleep infrastructure doesnt like our get_users in the backtrace code, we often end up with might_sleep warnings inside might_sleep warnings. Instead just be careful about pointers before dereferencing them. Also remove the hack where we only printed the bottom 32bits of the WCHAN value.
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