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    Subject[this_cpu_xx V4 06/20] this_cpu_ptr: Straight transformations
    Use this_cpu_ptr and __this_cpu_ptr in locations where straight
    transformations are possible because per_cpu_ptr is used with
    either smp_processor_id() or raw_smp_processor_id().

    cc: David Howells <dhowells@redhat.com>
    Acked-by: Tejun Heo <tj@kernel.org>
    cc: Ingo Molnar <mingo@elte.hu>
    cc: Rusty Russell <rusty@rustcorp.com.au>
    cc: Eric Dumazet <dada1@cosmosbay.com>
    Signed-off-by: Christoph Lameter <cl@linux-foundation.org>

    ---
    drivers/infiniband/hw/ehca/ehca_irq.c | 3 +--
    drivers/net/chelsio/sge.c | 5 ++---
    drivers/net/loopback.c | 2 +-
    fs/ext4/mballoc.c | 2 +-
    4 files changed, 5 insertions(+), 7 deletions(-)

    Index: linux-2.6/drivers/net/chelsio/sge.c
    ===================================================================
    --- linux-2.6.orig/drivers/net/chelsio/sge.c 2009-09-29 09:31:40.000000000 -0500
    +++ linux-2.6/drivers/net/chelsio/sge.c 2009-09-29 11:39:20.000000000 -0500
    @@ -1378,7 +1378,7 @@ static void sge_rx(struct sge *sge, stru
    }
    __skb_pull(skb, sizeof(*p));

    - st = per_cpu_ptr(sge->port_stats[p->iff], smp_processor_id());
    + st = this_cpu_ptr(sge->port_stats[p->iff]);

    skb->protocol = eth_type_trans(skb, adapter->port[p->iff].dev);
    if ((adapter->flags & RX_CSUM_ENABLED) && p->csum == 0xffff &&
    @@ -1780,8 +1780,7 @@ netdev_tx_t t1_start_xmit(struct sk_buff
    {
    struct adapter *adapter = dev->ml_priv;
    struct sge *sge = adapter->sge;
    - struct sge_port_stats *st = per_cpu_ptr(sge->port_stats[dev->if_port],
    - smp_processor_id());
    + struct sge_port_stats *st = this_cpu_ptr(sge->port_stats[dev->if_port]);
    struct cpl_tx_pkt *cpl;
    struct sk_buff *orig_skb = skb;
    int ret;
    Index: linux-2.6/drivers/net/loopback.c
    ===================================================================
    --- linux-2.6.orig/drivers/net/loopback.c 2009-09-29 09:31:40.000000000 -0500
    +++ linux-2.6/drivers/net/loopback.c 2009-09-29 11:39:20.000000000 -0500
    @@ -81,7 +81,7 @@ static netdev_tx_t loopback_xmit(struct

    /* it's OK to use per_cpu_ptr() because BHs are off */
    pcpu_lstats = dev->ml_priv;
    - lb_stats = per_cpu_ptr(pcpu_lstats, smp_processor_id());
    + lb_stats = this_cpu_ptr(pcpu_lstats);

    len = skb->len;
    if (likely(netif_rx(skb) == NET_RX_SUCCESS)) {
    Index: linux-2.6/fs/ext4/mballoc.c
    ===================================================================
    --- linux-2.6.orig/fs/ext4/mballoc.c 2009-09-29 09:31:40.000000000 -0500
    +++ linux-2.6/fs/ext4/mballoc.c 2009-09-29 11:39:20.000000000 -0500
    @@ -4210,7 +4210,7 @@ static void ext4_mb_group_or_file(struct
    * per cpu locality group is to reduce the contention between block
    * request from multiple CPUs.
    */
    - ac->ac_lg = per_cpu_ptr(sbi->s_locality_groups, raw_smp_processor_id());
    + ac->ac_lg = __this_cpu_ptr(sbi->s_locality_groups);

    /* we're going to use group allocation */
    ac->ac_flags |= EXT4_MB_HINT_GROUP_ALLOC;
    Index: linux-2.6/drivers/infiniband/hw/ehca/ehca_irq.c
    ===================================================================
    --- linux-2.6.orig/drivers/infiniband/hw/ehca/ehca_irq.c 2009-09-29 09:31:40.000000000 -0500
    +++ linux-2.6/drivers/infiniband/hw/ehca/ehca_irq.c 2009-09-29 11:39:20.000000000 -0500
    @@ -826,8 +826,7 @@ static void __cpuinit take_over_work(str
    cq = list_entry(cct->cq_list.next, struct ehca_cq, entry);

    list_del(&cq->entry);
    - __queue_comp_task(cq, per_cpu_ptr(pool->cpu_comp_tasks,
    - smp_processor_id()));
    + __queue_comp_task(cq, this_cpu_ptr(pool->cpu_comp_tasks));
    }

    spin_unlock_irqrestore(&cct->task_lock, flags_cct);
    --


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