Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 into for-linus-1

* 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6: (9356 commits)
  [media] rc: update for bitop name changes
  fs: simplify iget & friends
  fs: pull inode->i_lock up out of writeback_single_inode
  fs: rename inode_lock to inode_hash_lock
  fs: move i_wb_list out from under inode_lock
  fs: move i_sb_list out from under inode_lock
  fs: remove inode_lock from iput_final and prune_icache
  fs: Lock the inode LRU list separately
  fs: factor inode disposal
  fs: protect inode->i_state with inode->i_lock
  lib, arch: add filter argument to show_mem and fix private implementations
  SLUB: Write to per cpu data when allocating it
  slub: Fix debugobjects with lockless fastpath
  autofs4: Do not potentially dereference NULL pointer returned by fget() in autofs_dev_ioctl_setpipefd()
  autofs4 - remove autofs4_lock
  autofs4 - fix d_manage() return on rcu-walk
  autofs4 - fix autofs4_expire_indirect() traversal
  autofs4 - fix dentry leak in autofs4_expire_direct()
  autofs4 - reinstate last used update on access
  vfs - check non-mountpoint dentry might block in __follow_mount_rcu()
  ...

NOTE!

This merge commit was created to fix compilation error. The block
tree was merged upstream and removed the 'elv_queue_empty()'
function which the new 'mtdswap' driver is using. So a simple
merge of the mtd tree with upstream does not compile. And the
mtd tree has already be published, so re-basing it is not an option.

To fix this unfortunate situation, I had to merge upstream into the
mtd-2.6.git tree without committing, put the fixup patch on top of
this, and then commit this. The result is that we do not have commits
which do not compile.

In other words, this merge commit "merges" 3 things: the MTD tree, the
upstream tree, and the fixup patch.

1 files changed, 72 insertions, 72 deletions

diff --git a/drivers/net/sfc/rx.c b/drivers/net/sfc/rx.c
index 3925fd621177..c0fdb59030fb 100644
--- a/drivers/net/sfc/rx.c
+++ b/drivers/net/sfc/rx.c
@@ -1,7 +1,7 @@
 /****************************************************************************
  * Driver for Solarflare Solarstorm network controllers and boards
  * Copyright 2005-2006 Fen Systems Ltd.
- * Copyright 2005-2009 Solarflare Communications Inc.
+ * Copyright 2005-2011 Solarflare Communications Inc.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 as published
@@ -89,24 +89,37 @@ static unsigned int rx_refill_limit = 95;
  */
 #define EFX_RXD_HEAD_ROOM 2
 
-static inline unsigned int efx_rx_buf_offset(struct efx_rx_buffer *buf)
+/* Offset of ethernet header within page */
+static inline unsigned int efx_rx_buf_offset(struct efx_nic *efx,
+					     struct efx_rx_buffer *buf)
 {
 	/* Offset is always within one page, so we don't need to consider
 	 * the page order.
 	 */
-	return (__force unsigned long) buf->data & (PAGE_SIZE - 1);
+	return (((__force unsigned long) buf->dma_addr & (PAGE_SIZE - 1)) +
+		efx->type->rx_buffer_hash_size);
 }
 static inline unsigned int efx_rx_buf_size(struct efx_nic *efx)
 {
 	return PAGE_SIZE << efx->rx_buffer_order;
 }
 
-static inline u32 efx_rx_buf_hash(struct efx_rx_buffer *buf)
+static u8 *efx_rx_buf_eh(struct efx_nic *efx, struct efx_rx_buffer *buf)
 {
+	if (buf->is_page)
+		return page_address(buf->u.page) + efx_rx_buf_offset(efx, buf);
+	else
+		return ((u8 *)buf->u.skb->data +
+			efx->type->rx_buffer_hash_size);
+}
+
+static inline u32 efx_rx_buf_hash(const u8 *eh)
+{
+	/* The ethernet header is always directly after any hash. */
 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) || NET_IP_ALIGN % 4 == 0
-	return __le32_to_cpup((const __le32 *)(buf->data - 4));
+	return __le32_to_cpup((const __le32 *)(eh - 4));
 #else
-	const u8 *data = (const u8 *)(buf->data - 4);
+	const u8 *data = eh - 4;
 	return ((u32)data[0]       |
 		(u32)data[1] << 8  |
 		(u32)data[2] << 16 |
@@ -129,6 +142,7 @@ static int efx_init_rx_buffers_skb(struct efx_rx_queue *rx_queue)
 	struct efx_nic *efx = rx_queue->efx;
 	struct net_device *net_dev = efx->net_dev;
 	struct efx_rx_buffer *rx_buf;
+	struct sk_buff *skb;
 	int skb_len = efx->rx_buffer_len;
 	unsigned index, count;
 
@@ -136,24 +150,23 @@ static int efx_init_rx_buffers_skb(struct efx_rx_queue *rx_queue)
 		index = rx_queue->added_count & rx_queue->ptr_mask;
 		rx_buf = efx_rx_buffer(rx_queue, index);
 
-		rx_buf->skb = netdev_alloc_skb(net_dev, skb_len);
-		if (unlikely(!rx_buf->skb))
+		rx_buf->u.skb = skb = netdev_alloc_skb(net_dev, skb_len);
+		if (unlikely(!skb))
 			return -ENOMEM;
-		rx_buf->page = NULL;
 
 		/* Adjust the SKB for padding and checksum */
-		skb_reserve(rx_buf->skb, NET_IP_ALIGN);
+		skb_reserve(skb, NET_IP_ALIGN);
 		rx_buf->len = skb_len - NET_IP_ALIGN;
-		rx_buf->data = (char *)rx_buf->skb->data;
-		rx_buf->skb->ip_summed = CHECKSUM_UNNECESSARY;
+		rx_buf->is_page = false;
+		skb->ip_summed = CHECKSUM_UNNECESSARY;
 
 		rx_buf->dma_addr = pci_map_single(efx->pci_dev,
-						  rx_buf->data, rx_buf->len,
+						  skb->data, rx_buf->len,
 						  PCI_DMA_FROMDEVICE);
 		if (unlikely(pci_dma_mapping_error(efx->pci_dev,
 						   rx_buf->dma_addr))) {
-			dev_kfree_skb_any(rx_buf->skb);
-			rx_buf->skb = NULL;
+			dev_kfree_skb_any(skb);
+			rx_buf->u.skb = NULL;
 			return -EIO;
 		}
 
@@ -211,10 +224,9 @@ static int efx_init_rx_buffers_page(struct efx_rx_queue *rx_queue)
 		index = rx_queue->added_count & rx_queue->ptr_mask;
 		rx_buf = efx_rx_buffer(rx_queue, index);
 		rx_buf->dma_addr = dma_addr + EFX_PAGE_IP_ALIGN;
-		rx_buf->skb = NULL;
-		rx_buf->page = page;
-		rx_buf->data = page_addr + EFX_PAGE_IP_ALIGN;
+		rx_buf->u.page = page;
 		rx_buf->len = efx->rx_buffer_len - EFX_PAGE_IP_ALIGN;
+		rx_buf->is_page = true;
 		++rx_queue->added_count;
 		++rx_queue->alloc_page_count;
 		++state->refcnt;
@@ -235,19 +247,17 @@ static int efx_init_rx_buffers_page(struct efx_rx_queue *rx_queue)
 static void efx_unmap_rx_buffer(struct efx_nic *efx,
 				struct efx_rx_buffer *rx_buf)
 {
-	if (rx_buf->page) {
+	if (rx_buf->is_page && rx_buf->u.page) {
 		struct efx_rx_page_state *state;
 
-		EFX_BUG_ON_PARANOID(rx_buf->skb);
-
-		state = page_address(rx_buf->page);
+		state = page_address(rx_buf->u.page);
 		if (--state->refcnt == 0) {
 			pci_unmap_page(efx->pci_dev,
 				       state->dma_addr,
 				       efx_rx_buf_size(efx),
 				       PCI_DMA_FROMDEVICE);
 		}
-	} else if (likely(rx_buf->skb)) {
+	} else if (!rx_buf->is_page && rx_buf->u.skb) {
 		pci_unmap_single(efx->pci_dev, rx_buf->dma_addr,
 				 rx_buf->len, PCI_DMA_FROMDEVICE);
 	}
@@ -256,12 +266,12 @@ static void efx_unmap_rx_buffer(struct efx_nic *efx,
 static void efx_free_rx_buffer(struct efx_nic *efx,
 			       struct efx_rx_buffer *rx_buf)
 {
-	if (rx_buf->page) {
-		__free_pages(rx_buf->page, efx->rx_buffer_order);
-		rx_buf->page = NULL;
-	} else if (likely(rx_buf->skb)) {
-		dev_kfree_skb_any(rx_buf->skb);
-		rx_buf->skb = NULL;
+	if (rx_buf->is_page && rx_buf->u.page) {
+		__free_pages(rx_buf->u.page, efx->rx_buffer_order);
+		rx_buf->u.page = NULL;
+	} else if (!rx_buf->is_page && rx_buf->u.skb) {
+		dev_kfree_skb_any(rx_buf->u.skb);
+		rx_buf->u.skb = NULL;
 	}
 }
 
@@ -277,7 +287,7 @@ static void efx_fini_rx_buffer(struct efx_rx_queue *rx_queue,
 static void efx_resurrect_rx_buffer(struct efx_rx_queue *rx_queue,
 				    struct efx_rx_buffer *rx_buf)
 {
-	struct efx_rx_page_state *state = page_address(rx_buf->page);
+	struct efx_rx_page_state *state = page_address(rx_buf->u.page);
 	struct efx_rx_buffer *new_buf;
 	unsigned fill_level, index;
 
@@ -292,16 +302,14 @@ static void efx_resurrect_rx_buffer(struct efx_rx_queue *rx_queue,
 	}
 
 	++state->refcnt;
-	get_page(rx_buf->page);
+	get_page(rx_buf->u.page);
 
 	index = rx_queue->added_count & rx_queue->ptr_mask;
 	new_buf = efx_rx_buffer(rx_queue, index);
 	new_buf->dma_addr = rx_buf->dma_addr ^ (PAGE_SIZE >> 1);
-	new_buf->skb = NULL;
-	new_buf->page = rx_buf->page;
-	new_buf->data = (void *)
-		((__force unsigned long)rx_buf->data ^ (PAGE_SIZE >> 1));
+	new_buf->u.page = rx_buf->u.page;
 	new_buf->len = rx_buf->len;
+	new_buf->is_page = true;
 	++rx_queue->added_count;
 }
 
@@ -315,16 +323,15 @@ static void efx_recycle_rx_buffer(struct efx_channel *channel,
 	struct efx_rx_buffer *new_buf;
 	unsigned index;
 
-	if (rx_buf->page != NULL && efx->rx_buffer_len <= EFX_RX_HALF_PAGE &&
-	    page_count(rx_buf->page) == 1)
+	if (rx_buf->is_page && efx->rx_buffer_len <= EFX_RX_HALF_PAGE &&
+	    page_count(rx_buf->u.page) == 1)
 		efx_resurrect_rx_buffer(rx_queue, rx_buf);
 
 	index = rx_queue->added_count & rx_queue->ptr_mask;
 	new_buf = efx_rx_buffer(rx_queue, index);
 
 	memcpy(new_buf, rx_buf, sizeof(*new_buf));
-	rx_buf->page = NULL;
-	rx_buf->skb = NULL;
+	rx_buf->u.page = NULL;
 	++rx_queue->added_count;
 }
 
@@ -428,7 +435,7 @@ static void efx_rx_packet__check_len(struct efx_rx_queue *rx_queue,
 		 * data at the end of the skb will be trashed. So
 		 * we have no choice but to leak the fragment.
 		 */
-		*leak_packet = (rx_buf->skb != NULL);
+		*leak_packet = !rx_buf->is_page;
 		efx_schedule_reset(efx, RESET_TYPE_RX_RECOVERY);
 	} else {
 		if (net_ratelimit())
@@ -448,19 +455,18 @@ static void efx_rx_packet__check_len(struct efx_rx_queue *rx_queue,
  */
 static void efx_rx_packet_gro(struct efx_channel *channel,
 			      struct efx_rx_buffer *rx_buf,
-			      bool checksummed)
+			      const u8 *eh, bool checksummed)
 {
 	struct napi_struct *napi = &channel->napi_str;
 	gro_result_t gro_result;
 
 	/* Pass the skb/page into the GRO engine */
-	if (rx_buf->page) {
+	if (rx_buf->is_page) {
 		struct efx_nic *efx = channel->efx;
-		struct page *page = rx_buf->page;
+		struct page *page = rx_buf->u.page;
 		struct sk_buff *skb;
 
-		EFX_BUG_ON_PARANOID(rx_buf->skb);
-		rx_buf->page = NULL;
+		rx_buf->u.page = NULL;
 
 		skb = napi_get_frags(napi);
 		if (!skb) {
@@ -469,11 +475,11 @@ static void efx_rx_packet_gro(struct efx_channel *channel,
 		}
 
 		if (efx->net_dev->features & NETIF_F_RXHASH)
-			skb->rxhash = efx_rx_buf_hash(rx_buf);
+			skb->rxhash = efx_rx_buf_hash(eh);
 
 		skb_shinfo(skb)->frags[0].page = page;
 		skb_shinfo(skb)->frags[0].page_offset =
-			efx_rx_buf_offset(rx_buf);
+			efx_rx_buf_offset(efx, rx_buf);
 		skb_shinfo(skb)->frags[0].size = rx_buf->len;
 		skb_shinfo(skb)->nr_frags = 1;
 
@@ -487,11 +493,10 @@ static void efx_rx_packet_gro(struct efx_channel *channel,
 
 		gro_result = napi_gro_frags(napi);
 	} else {
-		struct sk_buff *skb = rx_buf->skb;
+		struct sk_buff *skb = rx_buf->u.skb;
 
-		EFX_BUG_ON_PARANOID(!skb);
 		EFX_BUG_ON_PARANOID(!checksummed);
-		rx_buf->skb = NULL;
+		rx_buf->u.skb = NULL;
 
 		gro_result = napi_gro_receive(napi, skb);
 	}
@@ -513,9 +518,6 @@ void efx_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index,
 	bool leak_packet = false;
 
 	rx_buf = efx_rx_buffer(rx_queue, index);
-	EFX_BUG_ON_PARANOID(!rx_buf->data);
-	EFX_BUG_ON_PARANOID(rx_buf->skb && rx_buf->page);
-	EFX_BUG_ON_PARANOID(!(rx_buf->skb || rx_buf->page));
 
 	/* This allows the refill path to post another buffer.
 	 * EFX_RXD_HEAD_ROOM ensures that the slot we are using
@@ -554,12 +556,12 @@ void efx_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index,
 	/* Prefetch nice and early so data will (hopefully) be in cache by
 	 * the time we look at it.
 	 */
-	prefetch(rx_buf->data);
+	prefetch(efx_rx_buf_eh(efx, rx_buf));
 
 	/* Pipeline receives so that we give time for packet headers to be
 	 * prefetched into cache.
 	 */
-	rx_buf->len = len;
+	rx_buf->len = len - efx->type->rx_buffer_hash_size;
 out:
 	if (channel->rx_pkt)
 		__efx_rx_packet(channel,
@@ -574,45 +576,43 @@ void __efx_rx_packet(struct efx_channel *channel,
 {
 	struct efx_nic *efx = channel->efx;
 	struct sk_buff *skb;
-
-	rx_buf->data += efx->type->rx_buffer_hash_size;
-	rx_buf->len -= efx->type->rx_buffer_hash_size;
+	u8 *eh = efx_rx_buf_eh(efx, rx_buf);
 
 	/* If we're in loopback test, then pass the packet directly to the
 	 * loopback layer, and free the rx_buf here
 	 */
 	if (unlikely(efx->loopback_selftest)) {
-		efx_loopback_rx_packet(efx, rx_buf->data, rx_buf->len);
+		efx_loopback_rx_packet(efx, eh, rx_buf->len);
 		efx_free_rx_buffer(efx, rx_buf);
 		return;
 	}
 
-	if (rx_buf->skb) {
-		prefetch(skb_shinfo(rx_buf->skb));
+	if (!rx_buf->is_page) {
+		skb = rx_buf->u.skb;
 
-		skb_reserve(rx_buf->skb, efx->type->rx_buffer_hash_size);
-		skb_put(rx_buf->skb, rx_buf->len);
+		prefetch(skb_shinfo(skb));
+
+		skb_reserve(skb, efx->type->rx_buffer_hash_size);
+		skb_put(skb, rx_buf->len);
 
 		if (efx->net_dev->features & NETIF_F_RXHASH)
-			rx_buf->skb->rxhash = efx_rx_buf_hash(rx_buf);
+			skb->rxhash = efx_rx_buf_hash(eh);
 
 		/* Move past the ethernet header. rx_buf->data still points
 		 * at the ethernet header */
-		rx_buf->skb->protocol = eth_type_trans(rx_buf->skb,
-						       efx->net_dev);
+		skb->protocol = eth_type_trans(skb, efx->net_dev);
 
-		skb_record_rx_queue(rx_buf->skb, channel->channel);
+		skb_record_rx_queue(skb, channel->channel);
 	}
 
-	if (likely(checksummed || rx_buf->page)) {
-		efx_rx_packet_gro(channel, rx_buf, checksummed);
+	if (likely(checksummed || rx_buf->is_page)) {
+		efx_rx_packet_gro(channel, rx_buf, eh, checksummed);
 		return;
 	}
 
 	/* We now own the SKB */
-	skb = rx_buf->skb;
-	rx_buf->skb = NULL;
-	EFX_BUG_ON_PARANOID(!skb);
+	skb = rx_buf->u.skb;
+	rx_buf->u.skb = NULL;
 
 	/* Set the SKB flags */
 	skb_checksum_none_assert(skb);