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| author | Eric Dumazet <edumazet@google.com> | 2016-04-20 17:31:31 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-04-20 17:53:22 +0300 |
| commit | cca1d81574d266d4a3aa33f3947297564525e127 (patch) | |
| tree | b90c1cc043aca75be750e0a6dd2b95bdb3046835 /include/net/netlink.h | |
| parent | b84e93077fe926bc65e23d887b54fc46be60b76e (diff) | |
| download | linux-cca1d81574d266d4a3aa33f3947297564525e127.tar.xz | |
net: fix HAVE_EFFICIENT_UNALIGNED_ACCESS typos
HAVE_EFFICIENT_UNALIGNED_ACCESS needs CONFIG_ prefix.
Also add a comment in nla_align_64bit() explaining we have
to add a padding if current skb->data is aligned, as it
certainly can be confusing.
Fixes: 35c5845957c7 ("net: Add helpers for 64-bit aligning netlink attributes.")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/netlink.h')
| -rw-r--r-- | include/net/netlink.h | 19 |
1 files changed, 11 insertions, 8 deletions
diff --git a/include/net/netlink.h b/include/net/netlink.h index e644b3489acf..cf95df1fa14b 100644 --- a/include/net/netlink.h +++ b/include/net/netlink.h @@ -1238,18 +1238,21 @@ static inline int nla_validate_nested(const struct nlattr *start, int maxtype, * Conditionally emit a padding netlink attribute in order to make * the next attribute we emit have a 64-bit aligned nla_data() area. * This will only be done in architectures which do not have - * HAVE_EFFICIENT_UNALIGNED_ACCESS defined. + * CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS defined. * * Returns zero on success or a negative error code. */ static inline int nla_align_64bit(struct sk_buff *skb, int padattr) { -#ifndef HAVE_EFFICIENT_UNALIGNED_ACCESS - if (IS_ALIGNED((unsigned long)skb->data, 8)) { - struct nlattr *attr = nla_reserve(skb, padattr, 0); - if (!attr) - return -EMSGSIZE; - } +#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS + /* The nlattr header is 4 bytes in size, that's why we test + * if the skb->data _is_ aligned. This NOP attribute, plus + * nlattr header for next attribute, will make nla_data() + * 8-byte aligned. + */ + if (IS_ALIGNED((unsigned long)skb->data, 8) && + !nla_reserve(skb, padattr, 0)) + return -EMSGSIZE; #endif return 0; } @@ -1261,7 +1264,7 @@ static inline int nla_align_64bit(struct sk_buff *skb, int padattr) static inline int nla_total_size_64bit(int payload) { return NLA_ALIGN(nla_attr_size(payload)) -#ifndef HAVE_EFFICIENT_UNALIGNED_ACCESS +#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS + NLA_ALIGN(nla_attr_size(0)) #endif ; |