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unix: uses an atomic type for scm files accounting

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So the scm_stat_{add,del} helper can be invoked with no
additional lock held.

This clean-up the code a bit and will make the next
patch easier.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2020-02-28 14:45:21 +01:00 • committed by David S. Miller
parent e955376277
commit 7782040b95
2 changed files with 7 additions and 16 deletions
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2
include/net/af_unix.h
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@ -42,7 +42,7 @@ struct unix_skb_parms {
} __randomize_layout;
struct scm_stat {
u32 nr_fds;
atomic_t nr_fds;
};
#define UNIXCB(skb) (*(struct unix_skb_parms *)&((skb)->cb))