Import 1.3.56

Makefile

 VERSION = 1
 PATCHLEVEL = 3
-SUBLEVEL = 55
+SUBLEVEL = 56
 
 ARCH = i386
 

arch/alpha/kernel/process.c

@@ -140,6 +140,7 @@ void copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
 	p->tss.usp = usp;
 	p->tss.ksp = (unsigned long) childstack;
 	p->tss.flags = 1;
+	p->mm->context = 0;
 }
 
 /*

arch/alpha/kernel/signal.c

@@ -23,7 +23,6 @@ asmlinkage int sys_waitpid(pid_t pid,unsigned long * stat_addr, int options);
 asmlinkage void ret_from_sys_call(void);
 asmlinkage int do_signal(unsigned long, struct pt_regs *, struct switch_stack *,
 	unsigned long, unsigned long);
-asmlinkage void imb(void);
 
 extern int ptrace_set_bpt (struct task_struct *child);
 extern int ptrace_cancel_bpt (struct task_struct *child);

fs/buffer.c

@@ -1099,7 +1099,7 @@ static int bread_page(unsigned long address, kdev_t dev, int b[], int size)
  */
 int generic_readpage(struct inode * inode, struct page * page)
 {
-	unsigned long block;
+	unsigned long block, address;
 	int *p, nr[PAGE_SIZE/512];
 	int i;
 
@@ -1113,10 +1113,20 @@ int generic_readpage(struct inode * inode, struct page * page)
 		p++;
 	} while (i > 0);
 
-	/* We should make this asynchronous, but this is good enough for now.. */
-	bread_page(page_address(page), inode->i_dev, nr, inode->i_sb->s_blocksize);
+	/*
+	 * We should make this asynchronous, but this is good enough for now..
+	 */
+
+	/* IO start */
+	page->count++;
+	address = page_address(page);
+	bread_page(address, inode->i_dev, nr, inode->i_sb->s_blocksize);
+
+	/* IO ready (this part should be in the "page ready callback" function) */
 	page->uptodate = 1;
 	wake_up(&page->wait);
+	free_page(address);
+
 	return 0;
 }
 

fs/msdos/mmap.c

@@ -27,14 +27,17 @@
 static unsigned long msdos_file_mmap_nopage(
 	struct vm_area_struct * area,
 	unsigned long address,
-	unsigned long page,
 	int error_code)
 {
 	struct inode * inode = area->vm_inode;
+	unsigned long page;
 	unsigned int clear;
 	int pos;
 	long gap;	/* distance from eof to pos */
 
+	page = __get_free_page(GFP_KERNEL);
+	if (!page)
+		return page;
 	address &= PAGE_MASK;
 	pos = address - area->vm_start + area->vm_offset;
 

fs/namei.c

@@ -757,7 +757,7 @@ asmlinkage int sys_link(const char * oldname, const char * newname)
 	char * to;
 	struct inode * oldinode;
 
-	error = namei(oldname, &oldinode);
+	error = lnamei(oldname, &oldinode);
 	if (error)
 		return error;
 	error = getname(newname,&to);

fs/ncpfs/mmap.c

@@ -31,15 +31,19 @@ static inline int min(int a, int b)
  */
 static unsigned long 
 ncp_file_mmap_nopage(struct vm_area_struct * area,
-		     unsigned long address, unsigned long page, int no_share)
+		     unsigned long address, int no_share)
 {
 	struct inode * inode = area->vm_inode;
+	unsigned long page;
 	unsigned int clear;
 	unsigned long tmp;
 	int bufsize;
 	int pos;
 	unsigned short fs;
 
+	page = __get_free_page(GFP_KERNEL);
+	if (!page)
+		return page;
 	address &= PAGE_MASK;
 	pos = address - area->vm_start + area->vm_offset;
 

fs/nfs/mmap.c

@@ -25,12 +25,14 @@
 #include <asm/system.h>
 
 /*
- * Fill in the supplied page for mmap
+ * Return a page for mmap. We need to start using the page cache,
+ * because otherwise we can't share pages between processes..
  */
 static unsigned long nfs_file_mmap_nopage(struct vm_area_struct * area,
-	unsigned long address, unsigned long page, int no_share)
+	unsigned long address, int no_share)
 {
 	struct inode * inode = area->vm_inode;
+	unsigned long page;
 	unsigned int clear;
 	unsigned long tmp;
 	int n;
@@ -38,6 +40,9 @@ static unsigned long nfs_file_mmap_nopage(struct vm_area_struct * area,
 	int pos;
 	struct nfs_fattr fattr;
 
+	page = __get_free_page(GFP_KERNEL);
+	if (!page)
+		return page;
 	address &= PAGE_MASK;
 	pos = address - area->vm_start + area->vm_offset;
 

fs/smbfs/mmap.c

@@ -25,15 +25,19 @@
  */
 static unsigned long 
 smb_file_mmap_nopage(struct vm_area_struct * area,
-		     unsigned long address, unsigned long page, int no_share)
+		     unsigned long address, int no_share)
 {
 	struct inode * inode = area->vm_inode;
+	unsigned long page;
 	unsigned int clear;
 	unsigned long tmp;
 	int n;
 	int i;
 	int pos;
 
+	page = __get_free_page(GFP_KERNEL);
+	if (!page)
+		return 0;
 	address &= PAGE_MASK;
 	pos = address - area->vm_start + area->vm_offset;
 

include/asm-alpha/mmu_context.h

@@ -7,16 +7,38 @@
  * Copyright (C) 1996, Linus Torvalds
  */
 
-#include <asm/pgtable.h>
+#include <linux/config.h>
+#include <asm/system.h>
 
 /*
- * The maximum ASN's the processor supports. On the EV4 this doesn't
- * matter as the pal-code doesn't use the ASNs anyway, on the EV5
+ * The maximum ASN's the processor supports.  On the EV4 this is 63
+ * but the PAL-code doesn't actually use this information.  On the
  * EV5 this is 127.
+ *
+ * On the EV4, the ASNs are more-or-less useless anyway, as they are
+ * only used as a icache tag, not for TB entries.  On the EV5 ASN's
+ * also validate the TB entries, and thus make a lot more sense.
+ *
+ * The EV4 ASN's don't even match the architecture manual, ugh.  And
+ * I quote: "If a processor implements address space numbers (ASNs),
+ * and the old PTE has the Address Space Match (ASM) bit clear (ASNs
+ * in use) and the Valid bit set, then entries can also effectively be
+ * made coherent by assigning a new, unused ASN to the currently
+ * running process and not reusing the previous ASN before calling the
+ * appropriate PALcode routine to invalidate the translation buffer
+ * (TB)". 
+ *
+ * In short, the EV4 has a "kind of" ASN capability, but it doesn't actually
+ * work correctly and can thus not be used (explaining the lack of PAL-code
+ * support).
  */
+#ifdef CONFIG_EV5
 #define MAX_ASN 127
+#else
+#define MAX_ASN 63
+#endif
 
-#define ASN_VERSION_SHIFT 32
+#define ASN_VERSION_SHIFT 16
 #define ASN_VERSION_MASK ((~0UL) << ASN_VERSION_SHIFT)
 #define ASN_FIRST_VERSION (1UL << ASN_VERSION_SHIFT)
 
@@ -33,6 +55,7 @@
  */
 extern inline void get_mmu_context(struct task_struct *p)
 {
+#ifdef CONFIG_EV5
 	static unsigned long asn_cache = ASN_FIRST_VERSION;
 	struct mm_struct * mm = p->mm;
 	unsigned long asn = mm->context;
@@ -44,7 +67,7 @@ extern inline void get_mmu_context(struct task_struct *p)
 		/* check if it's legal.. */
 		if ((asn & ~ASN_VERSION_MASK) > MAX_ASN) {
 			/* start a new version, invalidate all old asn's */
-			tbiap();
+			tbiap(); imb();
 			asn_cache = (asn_cache & ASN_VERSION_MASK) + ASN_FIRST_VERSION;
 			if (!asn_cache)
 				asn_cache = ASN_FIRST_VERSION;
@@ -53,6 +76,7 @@ extern inline void get_mmu_context(struct task_struct *p)
 		mm->context = asn;			/* full version + asn */
 		p->tss.asn = asn & ~ASN_VERSION_MASK;	/* just asn */
 	}
+#endif
 }
 
 #endif

include/asm-alpha/page.h

@@ -51,7 +51,7 @@ typedef unsigned long pgprot_t;
 /* to align the pointer to the (next) page boundary */
 #define PAGE_ALIGN(addr)		(((addr)+PAGE_SIZE-1)&PAGE_MASK)
 
-#define PAGE_OFFSET		0xFFFFFC0000000000
+#define PAGE_OFFSET		0xFFFFFC0000000000UL
 #define MAP_NR(addr)		((((unsigned long) (addr)) - PAGE_OFFSET) >> PAGE_SHIFT)
 
 #endif /* __KERNEL__ */

include/asm-alpha/pgtable.h

@@ -9,13 +9,7 @@
  * in <asm/page.h> (currently 8192).
  */
 
-extern void tbi(long type, ...);
-
-#define tbisi(x)	tbi(1,(x))
-#define tbisd(x)	tbi(2,(x))
-#define tbis(x)		tbi(3,(x))
-#define tbiap()		tbi(-1)
-#define tbia()		tbi(-2)
+#include <asm/system.h>
 
 /*
  * Invalidate current user mapping.

include/asm-alpha/system.h

@@ -59,6 +59,8 @@ extern void alpha_switch_to(unsigned long pctxp);
 	alpha_switch_to((unsigned long) &(p)->tss - 0xfffffc0000000000); \
 } while (0)
 
+extern void imb(void);
+
 #define mb() \
 __asm__ __volatile__("mb": : :"memory")
 
@@ -97,6 +99,17 @@ __old_ipl; })
 #define save_flags(flags)	do { flags = getipl(); } while (0)
 #define restore_flags(flags)	setipl(flags)
 
+/*
+ * TB routines..
+ */
+extern void tbi(long type, ...);
+
+#define tbisi(x)	tbi(1,(x))
+#define tbisd(x)	tbi(2,(x))
+#define tbis(x)		tbi(3,(x))
+#define tbiap()		tbi(-1)
+#define tbia()		tbi(-2)
+
 /*
  * Give prototypes to shut up gcc.
  */

include/linux/mm.h

@@ -98,8 +98,7 @@ struct vm_operations_struct {
 	void (*protect)(struct vm_area_struct *area, unsigned long, size_t, unsigned int newprot);
 	int (*sync)(struct vm_area_struct *area, unsigned long, size_t, unsigned int flags);
 	void (*advise)(struct vm_area_struct *area, unsigned long, size_t, unsigned int advise);
-	unsigned long (*nopage)(struct vm_area_struct * area, unsigned long address,
-		unsigned long page, int write_access);
+	unsigned long (*nopage)(struct vm_area_struct * area, unsigned long address, int write_access);
 	unsigned long (*wppage)(struct vm_area_struct * area, unsigned long address,
 		unsigned long page);
 	int (*swapout)(struct vm_area_struct *,  unsigned long, pte_t *);

include/linux/pagemap.h

@@ -39,6 +39,16 @@ static inline unsigned long _page_hashfn(struct inode * inode, unsigned long off
 
 #define page_hash(inode,offset) page_hash_table[_page_hashfn(inode,offset)]
 
+static inline int page_age_update(struct page * page, int accessed)
+{
+	unsigned int age = page->age;
+	if (accessed)
+		age |= PAGE_AGE_VALUE << 1;
+	age >>= 1;
+	page->age = age;
+	return age > (PAGE_AGE_VALUE >> 1);
+}
+
 static inline struct page * find_page(struct inode * inode, unsigned long offset)
 {
 	struct page *page;

mm/filemap.c

@@ -88,7 +88,7 @@ int shrink_mmap(int priority, unsigned long limit)
 			if (page->count != 1)
 				age |= PAGE_AGE_VALUE << 1;
 			page->age = age >> 1;
-			if (age <= PAGE_AGE_VALUE/2) {
+			if (age < PAGE_AGE_VALUE) {
 				remove_page_from_hash_queue(page);
 				remove_page_from_inode_queue(page);
 				free_page(page_address(page));
@@ -147,51 +147,47 @@ void update_vm_cache(struct inode * inode, unsigned long pos, const char * buf,
 }
 
 /*
- * Find a cached page and wait for it to become up-to-date, return
- * the page address.
- *
- * If no cached page can be found, create one using the supplied
- * new page instead (and return zero to indicate that we used the
- * supplied page in doing so).
+ * Try to read ahead in the file. "page_cache" is a potentially free page
+ * that we could use for the cache (if it is 0 we can try to create one,
+ * this is all overlapped with the IO on the previous page finishing anyway)
  */
-static unsigned long fill_page(struct inode * inode, unsigned long offset, unsigned long newpage)
+static unsigned long try_to_read_ahead(struct inode * inode, unsigned long offset, unsigned long page_cache)
 {
 	struct page * page;
 
+	if (!page_cache) {
+		page_cache = __get_free_page(GFP_KERNEL);
+		if (!page_cache)
+			return 0;
+	}
+#ifdef readahead_makes_sense_due_to_asynchronous_reads
+	offset = (offset + PAGE_SIZE) & PAGE_MASK;
 	page = find_page(inode, offset);
 	if (page) {
-		if (!page->uptodate)
-			sleep_on(&page->wait);
-		return page_address(page);
+		page->count--;
+		return page_cache;
 	}
-	page = mem_map + MAP_NR(newpage);
+	/*
+	 * Ok, add the new page to the hash-queues...
+	 */
+	page = mem_map + MAP_NR(page_cache);
 	page->count++;
 	page->uptodate = 0;
 	page->error = 0;
 	page->offset = offset;
 	add_page_to_inode_queue(inode, page);
 	add_page_to_hash_queue(inode, page);
-	inode->i_op->readpage(inode, page);
-	page->uptodate = 1;
-	wake_up(&page->wait);
-	return 0;
-}
 
-/*
- * Try to read ahead in the file. "page_cache" is a potentially free page
- * that we could use for the cache (if it is 0 we can try to create one,
- * this is all overlapped with the IO on the previous page finishing anyway)
- */
-static unsigned long try_to_read_ahead(struct inode * inode, unsigned long offset, unsigned long page_cache)
-{
-	if (!page_cache)
-		page_cache = __get_free_page(GFP_KERNEL);
-	offset = (offset + PAGE_SIZE) & PAGE_MASK;
-	/*
-	 * read-ahead is not implemented yet, but this is
-	 * where we should start..
+	/* 
+	 * And start IO on it..
+	 * (this should be asynchronous, but currently isn't)
 	 */
+	inode->i_op->readpage(inode, page);
+	free_page(page_cache);
+	return 0;
+#else
 	return page_cache;
+#endif
 }
 
 /*
@@ -293,43 +289,65 @@ int generic_file_read(struct inode * inode, struct file * filp, char * buf, int
 	return read;
 }
 
+/*
+ * Find a cached page and wait for it to become up-to-date, return
+ * the page address.
+ */
+static inline unsigned long fill_page(struct inode * inode, unsigned long offset)
+{
+	struct page * page;
+	unsigned long new_page;
+
+	page = find_page(inode, offset);
+	if (page)
+		goto found_page;
+	new_page = __get_free_page(GFP_KERNEL);
+	page = find_page(inode, offset);
+	if (page) {
+		if (new_page)
+			free_page(new_page);
+		goto found_page;
+	}
+	if (!new_page)
+		return 0;
+	page = mem_map + MAP_NR(new_page);
+	new_page = 0;
+	page->count++;
+	page->uptodate = 0;
+	page->error = 0;
+	page->offset = offset;
+	add_page_to_inode_queue(inode, page);
+	add_page_to_hash_queue(inode, page);
+	inode->i_op->readpage(inode, page);
+found_page:
+	if (!page->uptodate)
+		sleep_on(&page->wait);
+	return page_address(page);
+}
+
 /*
  * Semantics for shared and private memory areas are different past the end
  * of the file. A shared mapping past the last page of the file is an error
  * and results in a SIBGUS, while a private mapping just maps in a zero page.
  */
-static unsigned long filemap_nopage(struct vm_area_struct * area, unsigned long address,
-	unsigned long page, int no_share)
+static unsigned long filemap_nopage(struct vm_area_struct * area, unsigned long address, int no_share)
 {
 	unsigned long offset;
 	struct inode * inode = area->vm_inode;
-	unsigned long new_page;
+	unsigned long page;
 
 	offset = (address & PAGE_MASK) - area->vm_start + area->vm_offset;
 	if (offset >= inode->i_size && (area->vm_flags & VM_SHARED) && area->vm_mm == current->mm)
-		send_sig(SIGBUS, current, 1);
+		return 0;
 
-	new_page = fill_page(inode, offset, page);
-	if (new_page) {
-		if (no_share) {
-			memcpy((void *) page, (void *) new_page, PAGE_SIZE);
-			free_page(new_page);
-			return page;
-		}
+	page = fill_page(inode, offset);
+	if (page && no_share) {
+		unsigned long new_page = __get_free_page(GFP_KERNEL);
+		if (new_page)
+			memcpy((void *) new_page, (void *) page, PAGE_SIZE);
 		free_page(page);
 		return new_page;
 	}
-
-	if (no_share) {
-		new_page = __get_free_page(GFP_USER);
-		if (!new_page) {
-			oom(current);
-			new_page = pte_page(BAD_PAGE);
-		}
-		memcpy((void *) new_page, (void *) page, PAGE_SIZE);
-		free_page(page);
-		page = new_page;
-	}
 	return page;
 }
 

mm/memory.c

@@ -905,21 +905,19 @@ void do_no_page(struct task_struct * tsk, struct vm_area_struct * vma,
 		get_empty_page(tsk, vma, page_table);
 		return;
 	}
-	page = __get_free_page(GFP_KERNEL);
-	if (!page) {
-		oom(tsk);
-		put_page(page_table, BAD_PAGE);
-		return;
-	}
 	++tsk->maj_flt;
 	++vma->vm_mm->rss;
 	/*
-	 * The fourth argument is "no_share", which tells the low-level code
+	 * The third argument is "no_share", which tells the low-level code
 	 * to copy, not share the page even if sharing is possible.  It's
 	 * essentially an early COW detection 
 	 */
-	page = vma->vm_ops->nopage(vma, address, page,
-		write_access && !(vma->vm_flags & VM_SHARED));
+	page = vma->vm_ops->nopage(vma, address, write_access && !(vma->vm_flags & VM_SHARED));
+	if (!page) {
+		send_sig(SIGBUS, current, 1);
+		put_page(page_table, BAD_PAGE);
+		return;
+	}
 	/*
 	 * This silly early PAGE_DIRTY setting removes a race
 	 * due to the bad i386 page protection. But it's valid

mm/swap.c

@@ -22,6 +22,7 @@
 #include <linux/swap.h>
 #include <linux/fs.h>
 #include <linux/swapctl.h>
+#include <linux/pagemap.h>
 
 #include <asm/dma.h>
 #include <asm/system.h> /* for cli()/sti() */
@@ -420,17 +421,19 @@ static inline int try_to_swap_out(struct task_struct * tsk, struct vm_area_struc
 	pte_t pte;
 	unsigned long entry;
 	unsigned long page;
+	struct page * page_map;
 
 	pte = *page_table;
 	if (!pte_present(pte))
 		return 0;
 	page = pte_page(pte);
-	if (page >= high_memory)
+	if (MAP_NR(page) >= MAP_NR(high_memory))
 		return 0;
 	if (page >= limit)
 		return 0;
 
-	if (mem_map[MAP_NR(page)].reserved)
+	page_map = mem_map + MAP_NR(page);
+	if (page_map->reserved)
 		return 0;
 	/* Deal with page aging.  Pages age from being unused; they
 	 * rejuvinate on being accessed.  Only swap old pages (age==0
@@ -438,11 +441,10 @@ static inline int try_to_swap_out(struct task_struct * tsk, struct vm_area_struc
 	if ((pte_dirty(pte) && delete_from_swap_cache(page)) 
 	    || pte_young(pte))  {
 		set_pte(page_table, pte_mkold(pte));
-		touch_page(page);
+		page_age_update(page_map, 1);
 		return 0;
 	}	
-	age_page(page);
-	if (age_of(page))
+	if (page_age_update(page_map, pte_young(pte)))
 		return 0;
 	if (pte_dirty(pte)) {
 		if (vma->vm_ops && vma->vm_ops->swapout) {
@@ -451,7 +453,7 @@ static inline int try_to_swap_out(struct task_struct * tsk, struct vm_area_struc
 			if (vma->vm_ops->swapout(vma, address - vma->vm_start + vma->vm_offset, page_table))
 				kill_proc(pid, SIGBUS, 1);
 		} else {
-			if (mem_map[MAP_NR(page)].count != 1)
+			if (page_map->count != 1)
 				return 0;
 			if (!(entry = get_swap_page()))
 				return 0;
@@ -465,7 +467,7 @@ static inline int try_to_swap_out(struct task_struct * tsk, struct vm_area_struc
 		return 1;	/* we slept: the process may not exist any more */
 	}
         if ((entry = find_in_swap_cache(page)))  {
-		if (mem_map[MAP_NR(page)].count != 1) {
+		if (page_map->count != 1) {
 			set_pte(page_table, pte_mkdirty(pte));
 			printk("Aiee.. duplicated cached swap-cache entry\n");
 			return 0;