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| author | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2014-10-21 14:32:51 +0400 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2014-10-21 14:32:51 +0400 |
| commit | 1ef24960ab78554fe7e8e77d8fc86524fbd60d3c (patch) | |
| tree | b794f25550b7dbbe9cc8eda81633df9023b4821c /include/linux/dynamic_queue_limits.h | |
| parent | 5563caaf8b8cd22e35997d5d74cb3609df86b223 (diff) | |
| parent | f114040e3ea6e07372334ade75d1ee0775c355e1 (diff) | |
| download | linux-1ef24960ab78554fe7e8e77d8fc86524fbd60d3c.tar.xz | |
Merge tag 'v3.18-rc1' into patchwork
Linux 3.18-rc1
* tag 'v3.18-rc1': (9526 commits)
Linux 3.18-rc1
MAINTAINERS: corrected bcm2835 search
Net: DSA: Fix checking for get_phy_flags function
sparc64: Do not define thread fpregs save area as zero-length array.
sparc64: Fix corrupted thread fault code.
MAINTAINERS: Become the docs maintainer
x86,kvm,vmx: Preserve CR4 across VM entry
ipv6: fix a potential use after free in sit.c
ipv6: fix a potential use after free in ip6_offload.c
ipv4: fix a potential use after free in gre_offload.c
tcp: fix build error if IPv6 is not enabled
futex: Ensure get_futex_key_refs() always implies a barrier
bna: fix skb->truesize underestimation
net: dsa: add includes for ethtool and phy_fixed definitions
openvswitch: Set flow-key members.
netrom: use linux/uaccess.h
dsa: Fix conversion from host device to mii bus
tipc: fix bug in bundled buffer reception
ipv6: introduce tcp_v6_iif()
sfc: add support for skb->xmit_more
...
Diffstat (limited to 'include/linux/dynamic_queue_limits.h')
| -rw-r--r-- | include/linux/dynamic_queue_limits.h | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/include/linux/dynamic_queue_limits.h b/include/linux/dynamic_queue_limits.h index 5621547d631b..a4be70398ce1 100644 --- a/include/linux/dynamic_queue_limits.h +++ b/include/linux/dynamic_queue_limits.h @@ -73,14 +73,22 @@ static inline void dql_queued(struct dql *dql, unsigned int count) { BUG_ON(count > DQL_MAX_OBJECT); - dql->num_queued += count; dql->last_obj_cnt = count; + + /* We want to force a write first, so that cpu do not attempt + * to get cache line containing last_obj_cnt, num_queued, adj_limit + * in Shared state, but directly does a Request For Ownership + * It is only a hint, we use barrier() only. + */ + barrier(); + + dql->num_queued += count; } /* Returns how many objects can be queued, < 0 indicates over limit. */ static inline int dql_avail(const struct dql *dql) { - return dql->adj_limit - dql->num_queued; + return ACCESS_ONCE(dql->adj_limit) - ACCESS_ONCE(dql->num_queued); } /* Record number of completed objects and recalculate the limit. */ |