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netfilter: x_tables: Add note about how to free percpu counters 

Due to the way percpu counters are allocated and freed in blocks,
it is not safe to free counters individually.  Currently all callers
do the right thing, but let's note this restriction.

Fixes: ae0ac0ed6f ("netfilter: x_tables: pack percpu counter allocations")
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Ben Hutchings 2018-03-29 15:12:41 +01:00 committed by Pablo Neira Ayuso
parent c47d36b385
commit 9ba5c404bf
1 changed files with 3 additions and 1 deletions
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4
net/netfilter/x_tables.c
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@ -1854,7 +1854,9 @@ EXPORT_SYMBOL_GPL(xt_proto_fini);
* to fetch the real percpu counter.
*
* To speed up allocation and improve data locality, a 4kb block is
* allocated.
* allocated. Freeing any counter may free an entire block, so all
* counters allocated using the same state must be freed at the same
* time.
*
* xt_percpu_counter_alloc_state contains the base address of the
* allocated page and the current sub-offset.