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net/sched: get rid of qdisc->padded

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kmalloc() of sufficiently big portion of memory is cache-aligned
in regular conditions. If some debugging options are used,
there is no reason qdisc structures would need 64-byte alignment
if most other kernel structures are not aligned.

This get rid of QDISC_ALIGN and QDISC_ALIGNTO.

Addition of privdata field will help implementing
the reverse of qdisc_priv() and documents where
the private data is.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Allen Pais <allen.lkml@gmail.com>
Acked-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet
2020-10-07 09:51:11 -07:00
committed by Jakub Kicinski
parent 036dfd8322
commit 846e463a70
3 changed files with 10 additions and 23 deletions
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5
include/net/sch_generic.h
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@@ -91,7 +91,7 @@ struct Qdisc {
struct net_rate_estimator __rcu *rate_est;
struct gnet_stats_basic_cpu __percpu *cpu_bstats;
struct gnet_stats_queue __percpu *cpu_qstats;
int padded;
int pad;
refcount_t refcnt;
/*
@@ -112,6 +112,9 @@ struct Qdisc {
/* for NOLOCK qdisc, true if there are no enqueued skbs */
bool empty;
struct rcu_head rcu;
/* private data */
long privdata[] ____cacheline_aligned;
};
static inline void qdisc_refcount_inc(struct Qdisc *qdisc)