From: Dmitry Torokhov Date: Fri, 2 Nov 2007 05:55:36 +0000 (-0400) Subject: P54: use temporary variables to reduce size of generated code X-Git-Tag: v2.6.25-rc1~1162^2~637 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=eb76bf29dd4aceaf877b8971fbfda8617abe6e05;p=linux-2.6 P54: use temporary variables to reduce size of generated code When there are 2 linked structures, using a temporary variable to hold a pointer to the often used structure usually produces better code (smaller and faster) since compiler does not have to constantly re-fetch data from the first structure. Signed-off-by: Dmitry Torokhov Signed-off-by: John W. Linville --- diff --git a/drivers/net/wireless/p54pci.c b/drivers/net/wireless/p54pci.c index 410b54387f..b7a3bde0b6 100644 --- a/drivers/net/wireless/p54pci.c +++ b/drivers/net/wireless/p54pci.c @@ -141,6 +141,7 @@ static irqreturn_t p54p_simple_interrupt(int irq, void *dev_id) static int p54p_read_eeprom(struct ieee80211_hw *dev) { struct p54p_priv *priv = dev->priv; + struct p54p_ring_control *ring_control = priv->ring_control; int err; struct p54_control_hdr *hdr; void *eeprom; @@ -164,7 +165,7 @@ static int p54p_read_eeprom(struct ieee80211_hw *dev) goto out; } - memset(priv->ring_control, 0, sizeof(*priv->ring_control)); + memset(ring_control, 0, sizeof(*ring_control)); P54P_WRITE(ring_control_base, priv->ring_control_dma); P54P_READ(ring_control_base); udelay(10); @@ -194,14 +195,14 @@ static int p54p_read_eeprom(struct ieee80211_hw *dev) tx_mapping = pci_map_single(priv->pdev, (void *)hdr, EEPROM_READBACK_LEN, PCI_DMA_TODEVICE); - priv->ring_control->rx_mgmt[0].host_addr = cpu_to_le32(rx_mapping); - priv->ring_control->rx_mgmt[0].len = cpu_to_le16(0x2010); - priv->ring_control->tx_data[0].host_addr = cpu_to_le32(tx_mapping); - priv->ring_control->tx_data[0].device_addr = hdr->req_id; - priv->ring_control->tx_data[0].len = cpu_to_le16(EEPROM_READBACK_LEN); + ring_control->rx_mgmt[0].host_addr = cpu_to_le32(rx_mapping); + ring_control->rx_mgmt[0].len = cpu_to_le16(0x2010); + ring_control->tx_data[0].host_addr = cpu_to_le32(tx_mapping); + ring_control->tx_data[0].device_addr = hdr->req_id; + ring_control->tx_data[0].len = cpu_to_le16(EEPROM_READBACK_LEN); - priv->ring_control->host_idx[2] = cpu_to_le32(1); - priv->ring_control->host_idx[1] = cpu_to_le32(1); + ring_control->host_idx[2] = cpu_to_le32(1); + ring_control->host_idx[1] = cpu_to_le32(1); wmb(); mdelay(100); @@ -215,8 +216,8 @@ static int p54p_read_eeprom(struct ieee80211_hw *dev) pci_unmap_single(priv->pdev, rx_mapping, 0x2010, PCI_DMA_FROMDEVICE); - alen = le16_to_cpu(priv->ring_control->rx_mgmt[0].len); - if (le32_to_cpu(priv->ring_control->device_idx[2]) != 1 || + alen = le16_to_cpu(ring_control->rx_mgmt[0].len); + if (le32_to_cpu(ring_control->device_idx[2]) != 1 || alen < 0x10) { printk(KERN_ERR "%s (prism54pci): Cannot read eeprom!\n", pci_name(priv->pdev)); @@ -239,16 +240,17 @@ static int p54p_read_eeprom(struct ieee80211_hw *dev) static void p54p_refill_rx_ring(struct ieee80211_hw *dev) { struct p54p_priv *priv = dev->priv; + struct p54p_ring_control *ring_control = priv->ring_control; u32 limit, host_idx, idx; - host_idx = le32_to_cpu(priv->ring_control->host_idx[0]); + host_idx = le32_to_cpu(ring_control->host_idx[0]); limit = host_idx; - limit -= le32_to_cpu(priv->ring_control->device_idx[0]); - limit = ARRAY_SIZE(priv->ring_control->rx_data) - limit; + limit -= le32_to_cpu(ring_control->device_idx[0]); + limit = ARRAY_SIZE(ring_control->rx_data) - limit; - idx = host_idx % ARRAY_SIZE(priv->ring_control->rx_data); + idx = host_idx % ARRAY_SIZE(ring_control->rx_data); while (limit-- > 1) { - struct p54p_desc *desc = &priv->ring_control->rx_data[idx]; + struct p54p_desc *desc = &ring_control->rx_data[idx]; if (!desc->host_addr) { struct sk_buff *skb; @@ -270,17 +272,18 @@ static void p54p_refill_rx_ring(struct ieee80211_hw *dev) idx++; host_idx++; - idx %= ARRAY_SIZE(priv->ring_control->rx_data); + idx %= ARRAY_SIZE(ring_control->rx_data); } wmb(); - priv->ring_control->host_idx[0] = cpu_to_le32(host_idx); + ring_control->host_idx[0] = cpu_to_le32(host_idx); } static irqreturn_t p54p_interrupt(int irq, void *dev_id) { struct ieee80211_hw *dev = dev_id; struct p54p_priv *priv = dev->priv; + struct p54p_ring_control *ring_control = priv->ring_control; __le32 reg; spin_lock(&priv->lock); @@ -298,12 +301,12 @@ static irqreturn_t p54p_interrupt(int irq, void *dev_id) struct p54p_desc *desc; u32 idx, i; i = priv->tx_idx; - i %= ARRAY_SIZE(priv->ring_control->tx_data); - priv->tx_idx = idx = le32_to_cpu(priv->ring_control->device_idx[1]); - idx %= ARRAY_SIZE(priv->ring_control->tx_data); + i %= ARRAY_SIZE(ring_control->tx_data); + priv->tx_idx = idx = le32_to_cpu(ring_control->device_idx[1]); + idx %= ARRAY_SIZE(ring_control->tx_data); while (i != idx) { - desc = &priv->ring_control->tx_data[i]; + desc = &ring_control->tx_data[i]; if (priv->tx_buf[i]) { kfree(priv->tx_buf[i]); priv->tx_buf[i] = NULL; @@ -318,17 +321,17 @@ static irqreturn_t p54p_interrupt(int irq, void *dev_id) desc->flags = 0; i++; - i %= ARRAY_SIZE(priv->ring_control->tx_data); + i %= ARRAY_SIZE(ring_control->tx_data); } i = priv->rx_idx; - i %= ARRAY_SIZE(priv->ring_control->rx_data); - priv->rx_idx = idx = le32_to_cpu(priv->ring_control->device_idx[0]); - idx %= ARRAY_SIZE(priv->ring_control->rx_data); + i %= ARRAY_SIZE(ring_control->rx_data); + priv->rx_idx = idx = le32_to_cpu(ring_control->device_idx[0]); + idx %= ARRAY_SIZE(ring_control->rx_data); while (i != idx) { u16 len; struct sk_buff *skb; - desc = &priv->ring_control->rx_data[i]; + desc = &ring_control->rx_data[i]; len = le16_to_cpu(desc->len); skb = priv->rx_buf[i]; @@ -347,7 +350,7 @@ static irqreturn_t p54p_interrupt(int irq, void *dev_id) } i++; - i %= ARRAY_SIZE(priv->ring_control->rx_data); + i %= ARRAY_SIZE(ring_control->rx_data); } p54p_refill_rx_ring(dev); @@ -366,6 +369,7 @@ static void p54p_tx(struct ieee80211_hw *dev, struct p54_control_hdr *data, size_t len, int free_on_tx) { struct p54p_priv *priv = dev->priv; + struct p54p_ring_control *ring_control = priv->ring_control; unsigned long flags; struct p54p_desc *desc; dma_addr_t mapping; @@ -373,19 +377,19 @@ static void p54p_tx(struct ieee80211_hw *dev, struct p54_control_hdr *data, spin_lock_irqsave(&priv->lock, flags); - device_idx = le32_to_cpu(priv->ring_control->device_idx[1]); - idx = le32_to_cpu(priv->ring_control->host_idx[1]); - i = idx % ARRAY_SIZE(priv->ring_control->tx_data); + device_idx = le32_to_cpu(ring_control->device_idx[1]); + idx = le32_to_cpu(ring_control->host_idx[1]); + i = idx % ARRAY_SIZE(ring_control->tx_data); mapping = pci_map_single(priv->pdev, data, len, PCI_DMA_TODEVICE); - desc = &priv->ring_control->tx_data[i]; + desc = &ring_control->tx_data[i]; desc->host_addr = cpu_to_le32(mapping); desc->device_addr = data->req_id; desc->len = cpu_to_le16(len); desc->flags = 0; wmb(); - priv->ring_control->host_idx[1] = cpu_to_le32(idx + 1); + ring_control->host_idx[1] = cpu_to_le32(idx + 1); if (free_on_tx) priv->tx_buf[i] = data; @@ -397,7 +401,7 @@ static void p54p_tx(struct ieee80211_hw *dev, struct p54_control_hdr *data, /* FIXME: unlikely to happen because the device usually runs out of memory before we fill the ring up, but we can make it impossible */ - if (idx - device_idx > ARRAY_SIZE(priv->ring_control->tx_data) - 2) + if (idx - device_idx > ARRAY_SIZE(ring_control->tx_data) - 2) printk(KERN_INFO "%s: tx overflow.\n", wiphy_name(dev->wiphy)); } @@ -457,6 +461,7 @@ static int p54p_open(struct ieee80211_hw *dev) static void p54p_stop(struct ieee80211_hw *dev) { struct p54p_priv *priv = dev->priv; + struct p54p_ring_control *ring_control = priv->ring_control; unsigned int i; struct p54p_desc *desc; @@ -469,7 +474,7 @@ static void p54p_stop(struct ieee80211_hw *dev) P54P_WRITE(dev_int, cpu_to_le32(ISL38XX_DEV_INT_RESET)); for (i = 0; i < ARRAY_SIZE(priv->rx_buf); i++) { - desc = &priv->ring_control->rx_data[i]; + desc = &ring_control->rx_data[i]; if (desc->host_addr) pci_unmap_single(priv->pdev, le32_to_cpu(desc->host_addr), MAX_RX_SIZE, PCI_DMA_FROMDEVICE); @@ -478,7 +483,7 @@ static void p54p_stop(struct ieee80211_hw *dev) } for (i = 0; i < ARRAY_SIZE(priv->tx_buf); i++) { - desc = &priv->ring_control->tx_data[i]; + desc = &ring_control->tx_data[i]; if (desc->host_addr) pci_unmap_single(priv->pdev, le32_to_cpu(desc->host_addr), le16_to_cpu(desc->len), PCI_DMA_TODEVICE); @@ -487,7 +492,7 @@ static void p54p_stop(struct ieee80211_hw *dev) priv->tx_buf[i] = NULL; } - memset(priv->ring_control, 0, sizeof(*priv->ring_control)); + memset(ring_control, 0, sizeof(ring_control)); } static int __devinit p54p_probe(struct pci_dev *pdev,