Hi All,
mm/swapfile.c seems to have three potential races.
The first two are in
linux-2.5.62/mm/swap_state.c:87:add_to_swap_cache
which seems reachable without a lock from the callchain:
mm/swapfile.c:sys_swapoff:998->
sys_swapoff:1026->
try_to_unuse:591->
mm/swap_state.c:read_swap_cache_async:377->
add_to_swap_cache
add_to_swap_cache increments two global variables without a lock:
INC_CACHE_INFO(add_total);
and
INC_CACHE_INFO(exist_race);
The final one is in
linux-2.5.62/mm/swapfile.c:213:swap_entry_free
which seems to increment
nr_swap_pages++;
without a lock.
Are these real races? Or are these just stats variables? (Or is
there some implicit locking that protects these?)
Regards,
Dawson
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This archive was generated by hypermail 2b29 : Sun Mar 23 2003 - 22:00:40 EST