v2.4.0.1 -> v2.4.0.2

  - ISDN fixes
  - VM balancing tuning

Makefile

 VERSION = 2
 PATCHLEVEL = 4
 SUBLEVEL = 1
-EXTRAVERSION =-pre1
+EXTRAVERSION =-pre2
 
 KERNELRELEASE=$(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 

arch/i386/Makefile

@@ -50,7 +50,7 @@ ifdef CONFIG_M686
 CFLAGS += -march=i686
 endif
 
-ifdef CONFIG_M686FXSR
+ifdef CONFIG_MPENTIUMIII
 CFLAGS += -march=i686
 endif
 

drivers/isdn/hisax/md5sums.asc

@@ -10,7 +10,7 @@
 ca7bd9bac39203f3074f3f093948cc3c  isac.c
 a2ad619fd404b3149099a2984de9d23c  isdnl1.c
 d2a78e407f3d94876deac160c6f9aae6  isdnl2.c
-a109841c2e75b11fc8ef2c8718e24c3e  isdnl3.c
+e7932ca7ae39c497c17f13a2e1434fcd  isdnl3.c
 afb5f2f4ac296d6de45c856993b161e1  tei.c
 00023e2a482cb86a26ea870577ade5d6  callc.c
 a1834e9b2ec068440cff2e899eff4710  cert.c
@@ -25,9 +25,9 @@ a1834e9b2ec068440cff2e899eff4710  cert.c
 Version: 2.6.3i
 Charset: noconv
 
-iQCVAwUBOlMTgDpxHvX/mS9tAQFSbgP/W9y6tnnWHTRLGqyr3EY1OHZiQXERkAAu
-hp+Y8PIoX1GgAh4yZ7xhYwUsk6y0z5USdGuhC9ZHh+oZd57lPsJMnhkEZR5BVsYT
-r7jHwelP527+QCLkVUCHIVIWUW0ANzeZBhDV2vefkFb+gWLiZsBhaHssbcKGsMNG
-Ak4xS1ByqsM=
-=lsIJ
+iQCVAwUBOlxeLTpxHvX/mS9tAQH6RwP8DhyvqAnXFV6WIGi16iQ3vKikkPoqnDQs
+GEn5uCW0dPYKlwthD2Grj/JbMYZhOmCFuDxF7ufJnjTSDe/D8XNe2wngxzAiwcIe
+WjCrT8X95cuP3HZHscbFTEinVV0GAnoI0ZEgs5eBDhVHDqILLYMaTFBQaRH3jgXc
+i5VH88jPfUM=
+=qc+J
 -----END PGP SIGNATURE-----

drivers/scsi/megaraid.c

@@ -149,7 +149,6 @@
 #include <linux/version.h>
 
 #ifdef MODULE
-#include <linux/modversions.h>
 #include <linux/module.h>
 
 char kernel_version[] = UTS_RELEASE;

drivers/scsi/ppa.c

@@ -222,8 +222,8 @@ int ppa_detect(Scsi_Host_Template * host)
 	    printk("  supported by the imm (ZIP Plus) driver. If the\n");
 	    printk("  cable is marked with \"AutoDetect\", this is what has\n");
 	    printk("  happened.\n");
-	    return 0;
 	    spin_lock_irq(&io_request_lock);
+	    return 0;
 	}
 	try_again = 1;
 	goto retry_entry;

fs/nfs/flushd.c

@@ -71,18 +71,17 @@ int nfs_reqlist_init(struct nfs_server *server)
 	int			status = 0;
 
 	dprintk("NFS: writecache_init\n");
+
+	/* Create the RPC task */
+	if (!(task = rpc_new_task(server->client, NULL, RPC_TASK_ASYNC)))
+		return -ENOMEM;
+
 	spin_lock(&nfs_flushd_lock);
 	cache = server->rw_requests;
 
 	if (cache->task)
 		goto out_unlock;
 
-	/* Create the RPC task */
-	status = -ENOMEM;
-	task = rpc_new_task(server->client, NULL, RPC_TASK_ASYNC);
-	if (!task)
-		goto out_unlock;
-
 	task->tk_calldata = server;
 
 	cache->task = task;
@@ -99,6 +98,7 @@ int nfs_reqlist_init(struct nfs_server *server)
 	return 0;
  out_unlock:
 	spin_unlock(&nfs_flushd_lock);
+	rpc_release_task(task);
 	return status;
 }
 
@@ -195,7 +195,9 @@ void inode_remove_flushd(struct inode *inode)
 	if (*q) {
 		*q = inode->u.nfs_i.hash_next;
 		NFS_FLAGS(inode) &= ~NFS_INO_FLUSH;
+		spin_unlock(&nfs_flushd_lock);
 		iput(inode);
+		return;
 	}
  out:
 	spin_unlock(&nfs_flushd_lock);

include/linux/sched.h

@@ -219,7 +219,6 @@ struct mm_struct {
 	unsigned long rss, total_vm, locked_vm;
 	unsigned long def_flags;
 	unsigned long cpu_vm_mask;
-	unsigned long swap_cnt;	/* number of pages to swap on next pass */
 	unsigned long swap_address;
 
 	/* Architecture-specific MM context */

include/linux/swap.h

@@ -107,7 +107,7 @@ extern wait_queue_head_t kreclaimd_wait;
 extern int page_launder(int, int);
 extern int free_shortage(void);
 extern int inactive_shortage(void);
-extern void wakeup_kswapd(int);
+extern void wakeup_kswapd(void);
 extern int try_to_free_pages(unsigned int gfp_mask);
 
 /* linux/mm/page_io.c */

kernel/fork.c

@@ -134,7 +134,6 @@ static inline int dup_mmap(struct mm_struct * mm)
 	mm->mmap_cache = NULL;
 	mm->map_count = 0;
 	mm->cpu_vm_mask = 0;
-	mm->swap_cnt = 0;
 	mm->swap_address = 0;
 	pprev = &mm->mmap;
 	for (mpnt = current->mm->mmap ; mpnt ; mpnt = mpnt->vm_next) {

mm/filemap.c

@@ -306,7 +306,7 @@ static inline struct page * __find_page_nolock(struct address_space *mapping, un
 	 */
 	age_page_up(page);
 	if (inactive_shortage() > inactive_target / 2 && free_shortage())
-			wakeup_kswapd(0);
+			wakeup_kswapd();
 not_found:
 	return page;
 }
@@ -1835,6 +1835,7 @@ static long madvise_fixup_start(struct vm_area_struct * vma,
 	n->vm_end = end;
 	setup_read_behavior(n, behavior);
 	n->vm_raend = 0;
+	if (n->vm_file)
 		get_file(n->vm_file);
 	if (n->vm_ops && n->vm_ops->open)
 		n->vm_ops->open(n);
@@ -1861,6 +1862,7 @@ static long madvise_fixup_end(struct vm_area_struct * vma,
 	n->vm_pgoff += (n->vm_start - vma->vm_start) >> PAGE_SHIFT;
 	setup_read_behavior(n, behavior);
 	n->vm_raend = 0;
+	if (n->vm_file)
 		get_file(n->vm_file);
 	if (n->vm_ops && n->vm_ops->open)
 		n->vm_ops->open(n);
@@ -1893,6 +1895,7 @@ static long madvise_fixup_middle(struct vm_area_struct * vma,
 	right->vm_pgoff += (right->vm_start - left->vm_start) >> PAGE_SHIFT;
 	left->vm_raend = 0;
 	right->vm_raend = 0;
+	if (vma->vm_file)
 		atomic_add(2, &vma->vm_file->f_count);
 
 	if (vma->vm_ops && vma->vm_ops->open) {

mm/page_alloc.c

@@ -16,6 +16,7 @@
 #include <linux/interrupt.h>
 #include <linux/pagemap.h>
 #include <linux/bootmem.h>
+#include <linux/slab.h>
 
 int nr_swap_pages;
 int nr_active_pages;
@@ -303,7 +304,7 @@ struct page * __alloc_pages(zonelist_t *zonelist, unsigned long order)
 	 * an inactive page shortage, wake up kswapd.
 	 */
 	if (inactive_shortage() > inactive_target / 2 && free_shortage())
-		wakeup_kswapd(0);
+		wakeup_kswapd();
 	/*
 	 * If we are about to get low on free pages and cleaning
 	 * the inactive_dirty pages would fix the situation,
@@ -379,7 +380,7 @@ struct page * __alloc_pages(zonelist_t *zonelist, unsigned long order)
 	 * - if we don't have __GFP_IO set, kswapd may be
 	 *   able to free some memory we can't free ourselves
 	 */
-	wakeup_kswapd(0);
+	wakeup_kswapd();
 	if (gfp_mask & __GFP_WAIT) {
 		__set_current_state(TASK_RUNNING);
 		current->policy |= SCHED_YIELD;
@@ -404,7 +405,7 @@ struct page * __alloc_pages(zonelist_t *zonelist, unsigned long order)
 	 * - we're doing a higher-order allocation
 	 * 	--> move pages to the free list until we succeed
 	 * - we're /really/ tight on memory
-	 * 	--> wait on the kswapd waitqueue until memory is freed
+	 * 	--> try to free pages ourselves with page_launder
 	 */
 	if (!(current->flags & PF_MEMALLOC)) {
 		/*
@@ -443,36 +444,23 @@ struct page * __alloc_pages(zonelist_t *zonelist, unsigned long order)
 		/*
 		 * When we arrive here, we are really tight on memory.
 		 *
-		 * We wake up kswapd and sleep until kswapd wakes us
-		 * up again. After that we loop back to the start.
-		 *
-		 * We have to do this because something else might eat
-		 * the memory kswapd frees for us and we need to be
-		 * reliable. Note that we don't loop back for higher
-		 * order allocations since it is possible that kswapd
-		 * simply cannot free a large enough contiguous area
-		 * of memory *ever*.
-		 */
-		if ((gfp_mask & (__GFP_WAIT|__GFP_IO)) == (__GFP_WAIT|__GFP_IO)) {
-			wakeup_kswapd(1);
-			memory_pressure++;
-			if (!order)
-				goto try_again;
-		/*
-		 * If __GFP_IO isn't set, we can't wait on kswapd because
-		 * kswapd just might need some IO locks /we/ are holding ...
-		 *
-		 * SUBTLE: The scheduling point above makes sure that
-		 * kswapd does get the chance to free memory we can't
-		 * free ourselves...
+		 * We try to free pages ourselves by:
+		 * 	- shrinking the i/d caches.
+		 * 	- reclaiming unused memory from the slab caches.
+		 * 	- swapping/syncing pages to disk (done by page_launder)
+		 * 	- moving clean pages from the inactive dirty list to
+		 * 	  the inactive clean list. (done by page_launder)
 		 */
-		} else if (gfp_mask & __GFP_WAIT) {
-			try_to_free_pages(gfp_mask);
-			memory_pressure++;
+		if (gfp_mask & __GFP_WAIT) {
+			shrink_icache_memory(6, gfp_mask);
+			shrink_dcache_memory(6, gfp_mask);
+			kmem_cache_reap(gfp_mask);
+
+			page_launder(gfp_mask, 1);
+
 			if (!order)
 				goto try_again;
 		}
-
 	}
 
 	/*

mm/slab.c

@@ -1702,7 +1702,7 @@ static void enable_all_cpucaches (void)
  * kmem_cache_reap - Reclaim memory from caches.
  * @gfp_mask: the type of memory required.
  *
- * Called from try_to_free_page().
+ * Called from do_try_to_free_pages() and __alloc_pages()
  */
 void kmem_cache_reap (int gfp_mask)
 {

mm/vmscan.c

@@ -35,45 +35,21 @@
  * using a process that no longer actually exists (it might
  * have died while we slept).
  */
-static int try_to_swap_out(struct mm_struct * mm, struct vm_area_struct* vma, unsigned long address, pte_t * page_table)
+static void try_to_swap_out(struct mm_struct * mm, struct vm_area_struct* vma, unsigned long address, pte_t * page_table, struct page *page)
 {
 	pte_t pte;
 	swp_entry_t entry;
-	struct page * page;
-	int onlist;
-
-	pte = *page_table;
-	if (!pte_present(pte))
-		goto out_failed;
-	page = pte_page(pte);
-	if ((!VALID_PAGE(page)) || PageReserved(page))
-		goto out_failed;
-
-	if (!mm->swap_cnt)
-		return 1;
 
-	mm->swap_cnt--;
-
-	onlist = PageActive(page);
 	/* Don't look at this pte if it's been accessed recently. */
 	if (ptep_test_and_clear_young(page_table)) {
-		age_page_up(page);
-		goto out_failed;
+		page->age += PAGE_AGE_ADV;
+		if (page->age > PAGE_AGE_MAX)
+			page->age = PAGE_AGE_MAX;
+		return;
 	}
-	if (!onlist)
-		/* The page is still mapped, so it can't be freeable... */
-		age_page_down_ageonly(page);
-
-	/*
-	 * If the page is in active use by us, or if the page
-	 * is in active use by others, don't unmap it or
-	 * (worse) start unneeded IO.
-	 */
-	if (page->age > 0)
-		goto out_failed;
 
 	if (TryLockPage(page))
-		goto out_failed;
+		return;
 
 	/* From this point on, the odds are that we're going to
 	 * nuke this pte, so read and clear the pte.  This hook
@@ -87,9 +63,6 @@ static int try_to_swap_out(struct mm_struct * mm, struct vm_area_struct* vma, un
 	 * Is the page already in the swap cache? If so, then
 	 * we can just drop our reference to it without doing
 	 * any IO - it's already up-to-date on disk.
-	 *
-	 * Return 0, as we didn't actually free any real
-	 * memory, and we should just continue our scan.
 	 */
 	if (PageSwapCache(page)) {
 		entry.val = page->index;
@@ -103,8 +76,7 @@ static int try_to_swap_out(struct mm_struct * mm, struct vm_area_struct* vma, un
 		mm->rss--;
 		deactivate_page(page);
 		page_cache_release(page);
-out_failed:
-		return 0;
+		return;
 	}
 
 	/*
@@ -153,34 +125,20 @@ static int try_to_swap_out(struct mm_struct * mm, struct vm_area_struct* vma, un
 out_unlock_restore:
 	set_pte(page_table, pte);
 	UnlockPage(page);
-	return 0;
+	return;
 }
 
-/*
- * A new implementation of swap_out().  We do not swap complete processes,
- * but only a small number of blocks, before we continue with the next
- * process.  The number of blocks actually swapped is determined on the
- * number of page faults, that this process actually had in the last time,
- * so we won't swap heavily used processes all the time ...
- *
- * Note: the priority argument is a hint on much CPU to waste with the
- *       swap block search, not a hint, of how much blocks to swap with
- *       each process.
- *
- * (C) 1993 Kai Petzke, wpp@marie.physik.tu-berlin.de
- */
-
-static inline int swap_out_pmd(struct mm_struct * mm, struct vm_area_struct * vma, pmd_t *dir, unsigned long address, unsigned long end)
+static int swap_out_pmd(struct mm_struct * mm, struct vm_area_struct * vma, pmd_t *dir, unsigned long address, unsigned long end, int count)
 {
 	pte_t * pte;
 	unsigned long pmd_end;
 
 	if (pmd_none(*dir))
-		return 0;
+		return count;
 	if (pmd_bad(*dir)) {
 		pmd_ERROR(*dir);
 		pmd_clear(dir);
-		return 0;
+		return count;
 	}
 	
 	pte = pte_offset(dir, address);
@@ -190,28 +148,33 @@ static inline int swap_out_pmd(struct mm_struct * mm, struct vm_area_struct * vm
 		end = pmd_end;
 
 	do {
-		int result;
-		mm->swap_address = address + PAGE_SIZE;
-		result = try_to_swap_out(mm, vma, address, pte);
-		if (result)
-			return result;
+		if (pte_present(*pte)) {
+			struct page *page = pte_page(*pte);
+
+			if (VALID_PAGE(page) && !PageReserved(page)) {
+				try_to_swap_out(mm, vma, address, pte, page);
+				if (--count)
+					break;
+			}
+		}
 		address += PAGE_SIZE;
 		pte++;
 	} while (address && (address < end));
-	return 0;
+	mm->swap_address = address + PAGE_SIZE;
+	return count;
 }
 
-static inline int swap_out_pgd(struct mm_struct * mm, struct vm_area_struct * vma, pgd_t *dir, unsigned long address, unsigned long end)
+static inline int swap_out_pgd(struct mm_struct * mm, struct vm_area_struct * vma, pgd_t *dir, unsigned long address, unsigned long end, int count)
 {
 	pmd_t * pmd;
 	unsigned long pgd_end;
 
 	if (pgd_none(*dir))
-		return 0;
+		return count;
 	if (pgd_bad(*dir)) {
 		pgd_ERROR(*dir);
 		pgd_clear(dir);
-		return 0;
+		return count;
 	}
 
 	pmd = pmd_offset(dir, address);
@@ -221,23 +184,23 @@ static inline int swap_out_pgd(struct mm_struct * mm, struct vm_area_struct * vm
 		end = pgd_end;
 	
 	do {
-		int result = swap_out_pmd(mm, vma, pmd, address, end);
-		if (result)
-			return result;
+		count = swap_out_pmd(mm, vma, pmd, address, end, count);
+		if (!count)
+			break;
 		address = (address + PMD_SIZE) & PMD_MASK;
 		pmd++;
 	} while (address && (address < end));
-	return 0;
+	return count;
 }
 
-static int swap_out_vma(struct mm_struct * mm, struct vm_area_struct * vma, unsigned long address)
+static int swap_out_vma(struct mm_struct * mm, struct vm_area_struct * vma, unsigned long address, int count)
 {
 	pgd_t *pgdir;
 	unsigned long end;
 
 	/* Don't swap out areas which are locked down */
 	if (vma->vm_flags & (VM_LOCKED|VM_RESERVED))
-		return 0;
+		return count;
 
 	pgdir = pgd_offset(mm, address);
 
@@ -245,18 +208,17 @@ static int swap_out_vma(struct mm_struct * mm, struct vm_area_struct * vma, unsi
 	if (address >= end)
 		BUG();
 	do {
-		int result = swap_out_pgd(mm, vma, pgdir, address, end);
-		if (result)
-			return result;
+		count = swap_out_pgd(mm, vma, pgdir, address, end, count);
+		if (!count)
+			break;
 		address = (address + PGDIR_SIZE) & PGDIR_MASK;
 		pgdir++;
 	} while (address && (address < end));
-	return 0;
+	return count;
 }
 
-static int swap_out_mm(struct mm_struct * mm)
+static int swap_out_mm(struct mm_struct * mm, int count)
 {
-	int result = 0;
 	unsigned long address;
 	struct vm_area_struct* vma;
 
@@ -270,15 +232,14 @@ static int swap_out_mm(struct mm_struct * mm)
 	 */
 	spin_lock(&mm->page_table_lock);
 	address = mm->swap_address;
-	mm->swap_cnt = mm->rss >> 4;
 	vma = find_vma(mm, address);
 	if (vma) {
 		if (address < vma->vm_start)
 			address = vma->vm_start;
 
 		for (;;) {
-			result = swap_out_vma(mm, vma, address);
-			if (result)
+			count = swap_out_vma(mm, vma, address, count);
+			if (!count)
 				goto out_unlock;
 			vma = vma->vm_next;
 			if (!vma)
@@ -288,30 +249,39 @@ static int swap_out_mm(struct mm_struct * mm)
 	}
 	/* Reset to 0 when we reach the end of address space */
 	mm->swap_address = 0;
-	mm->swap_cnt = 0;
 
 out_unlock:
 	spin_unlock(&mm->page_table_lock);
-	return result;
+	return !count;
 }
 
 /*
- * Select the task with maximal swap_cnt and try to swap out a page.
  * N.B. This function returns only 0 or 1.  Return values != 1 from
  * the lower level routines result in continued processing.
  */
 #define SWAP_SHIFT 5
 #define SWAP_MIN 8
 
+static inline int swap_amount(struct mm_struct *mm)
+{
+	int nr = mm->rss >> SWAP_SHIFT;
+	return nr < SWAP_MIN ? SWAP_MIN : nr;
+}
+
 static int swap_out(unsigned int priority, int gfp_mask)
 {
 	int counter;
 	int retval = 0;
+	struct mm_struct *mm = current->mm;
+
+	/* Always start by trying to penalize the process that is allocating memory */
+	if (mm)
+		retval = swap_out_mm(mm, swap_amount(mm));
 
+	/* Then, look at the other mm's */
 	counter = mmlist_nr >> priority;
 	do {
 		struct list_head *p;
-		struct mm_struct *mm;
 
 		spin_lock(&mmlist_lock);
 		p = init_mm.mmlist.next;
@@ -327,13 +297,14 @@ static int swap_out(unsigned int priority, int gfp_mask)
 		atomic_inc(&mm->mm_users);
 		spin_unlock(&mmlist_lock);
 
-		retval |= swap_out_mm(mm);
+		/* Walk about 6% of the address space each time */
+		retval |= swap_out_mm(mm, swap_amount(mm));
 		mmput(mm);
 	} while (--counter >= 0);
 	return retval;
 
 empty:
-	spin_lock(&mmlist_lock);
+	spin_unlock(&mmlist_lock);
 	return 0;
 }
 
@@ -816,33 +787,35 @@ int inactive_shortage(void)
  * really care about latency. In that case we don't try
  * to free too many pages.
  */
+#define DEF_PRIORITY (6)
 static int refill_inactive(unsigned int gfp_mask, int user)
 {
-	int priority, count, start_count;
+	int count, start_count, maxtry;
 
 	count = inactive_shortage() + free_shortage();
 	if (user)
 		count = (1 << page_cluster);
 	start_count = count;
 
-	/* Always trim SLAB caches when memory gets low. */
-	kmem_cache_reap(gfp_mask);
-
-	priority = 6;
+	maxtry = 6;
 	do {
 		if (current->need_resched) {
 			__set_current_state(TASK_RUNNING);
 			schedule();
 		}
 
-		while (refill_inactive_scan(priority, 1)) {
+		while (refill_inactive_scan(DEF_PRIORITY, 1)) {
 			if (--count <= 0)
 				goto done;
 		}
 
 		/* If refill_inactive_scan failed, try to page stuff out.. */
-		swap_out(priority, gfp_mask);
-	} while (!inactive_shortage());
+		swap_out(DEF_PRIORITY, gfp_mask);
+
+		if (--maxtry <= 0)
+				return 0;
+		
+	} while (inactive_shortage());
 
 done:
 	return (count < start_count);
@@ -872,19 +845,13 @@ static int do_try_to_free_pages(unsigned int gfp_mask, int user)
 		ret += refill_inactive(gfp_mask, user);
 
 	/* 	
-	 * Delete pages from the inode and dentry cache 
-	 * if memory is low. 
+	 * Delete pages from the inode and dentry caches and 
+	 * reclaim unused slab cache if memory is low.
 	 */
 	if (free_shortage()) {
-		shrink_dcache_memory(6, gfp_mask);
-		shrink_icache_memory(6, gfp_mask);
-	} else { 
-
-		/*
-		 * Reclaim unused slab cache memory.
-		 */
+		shrink_dcache_memory(DEF_PRIORITY, gfp_mask);
+		shrink_icache_memory(DEF_PRIORITY, gfp_mask);
 		kmem_cache_reap(gfp_mask);
-		ret = 1;
 	} 
 
 	return ret;
@@ -938,13 +905,8 @@ int kswapd(void *unused)
 		static int recalc = 0;
 
 		/* If needed, try to free some memory. */
-		if (inactive_shortage() || free_shortage()) {
-			int wait = 0;
-			/* Do we need to do some synchronous flushing? */
-			if (waitqueue_active(&kswapd_done))
-				wait = 1;
-			do_try_to_free_pages(GFP_KSWAPD, wait);
-		}
+		if (inactive_shortage() || free_shortage()) 
+			do_try_to_free_pages(GFP_KSWAPD, 0);
 
 		/*
 		 * Do some (very minimal) background scanning. This
@@ -952,7 +914,7 @@ int kswapd(void *unused)
 		 * every minute. This clears old referenced bits
 		 * and moves unused pages to the inactive list.
 		 */
-		refill_inactive_scan(6, 0);
+		refill_inactive_scan(DEF_PRIORITY, 0);
 
 		/* Once a second, recalculate some VM stats. */
 		if (time_after(jiffies, recalc + HZ)) {
@@ -960,11 +922,6 @@ int kswapd(void *unused)
 			recalculate_vm_stats();
 		}
 
-		/*
-		 * Wake up everybody waiting for free memory
-		 * and unplug the disk queue.
-		 */
-		wake_up_all(&kswapd_done);
 		run_task_queue(&tq_disk);
 
 		/* 
@@ -995,33 +952,10 @@ int kswapd(void *unused)
 	}
 }
 
-void wakeup_kswapd(int block)
+void wakeup_kswapd(void)
 {
-	DECLARE_WAITQUEUE(wait, current);
-
-	if (current == kswapd_task)
-		return;
-
-	if (!block) {
-		if (waitqueue_active(&kswapd_wait))
-			wake_up(&kswapd_wait);
-		return;
-	}
-
-	/*
-	 * Kswapd could wake us up before we get a chance
-	 * to sleep, so we have to be very careful here to
-	 * prevent SMP races...
-	 */
-	__set_current_state(TASK_UNINTERRUPTIBLE);
-	add_wait_queue(&kswapd_done, &wait);
-
-	if (waitqueue_active(&kswapd_wait))
-		wake_up(&kswapd_wait);
-	schedule();
-
-	remove_wait_queue(&kswapd_done, &wait);
-	__set_current_state(TASK_RUNNING);
+	if (current != kswapd_task)
+		wake_up_process(kswapd_task);
 }
 
 /*
@@ -1046,7 +980,7 @@ DECLARE_WAIT_QUEUE_HEAD(kreclaimd_wait);
 /*
  * Kreclaimd will move pages from the inactive_clean list to the
  * free list, in order to keep atomic allocations possible under
- * all circumstances. Even when kswapd is blocked on IO.
+ * all circumstances.
  */
 int kreclaimd(void *unused)
 {

net/ipv4/igmp.c

@@ -504,8 +504,8 @@ void ip_mc_inc_group(struct in_device *in_dev, u32 addr)
 	im->timer.function=&igmp_timer_expire;
 	im->unsolicit_count = IGMP_Unsolicited_Report_Count;
 	im->reporter = 0;
-	im->loaded = 0;
 #endif
+	im->loaded = 0;
 	write_lock_bh(&in_dev->lock);
 	im->next=in_dev->mc_list;
 	in_dev->mc_list=im;

net/ipv4/tcp.c

@@ -954,7 +954,7 @@ int tcp_sendmsg(struct sock *sk, struct msghdr *msg, int size)
 			 */
 			skb = sk->write_queue.prev;
 			if (tp->send_head &&
-			    (mss_now - skb->len) > 0) {
+			    (mss_now > skb->len)) {
 				copy = skb->len;
 				if (skb_tailroom(skb) > 0) {
 					int last_byte_was_odd = (copy % 4);

net/ipv4/tcp_input.c

@@ -1705,7 +1705,7 @@ static __inline__ void tcp_ack_packets_out(struct sock *sk, struct tcp_opt *tp)
 
 		if ((__s32)when < (__s32)tp->rttvar)
 			when = tp->rttvar;
-		tcp_reset_xmit_timer(sk, TCP_TIME_RETRANS, when);
+		tcp_reset_xmit_timer(sk, TCP_TIME_RETRANS, min(when, TCP_RTO_MAX));
 	}
 }