rcu: Increase kfree_rcu() offset range
The kfree_rcu() function operates by placing an offset into the rcu_head
structure in place of the function pointer that is normally there.
This offset cannot exceed 4095, on the theory that no Linux kernel will
ever have executable code in page zero. However, the rcu_head structure
contains a pair of function pointers, and should never be misaligned.
This commit therefore divides the offset by the size of a pointer when
being placed into the rcu_head structure, and multiplies it by this
same constant when pulling it out.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
2 files changed
