pl15a fixes the buffer cache growing problem, adds emulation for a

few unimportant floating point instructions (i287 instructions that
are No-Ops on the i387, so "emulating" them is easy :^) and fixes a
silly bug when mmap'ing stuff write-only.  It also fixes a buggy lock
in the networking.

Makefile

 VERSION = 0.99
 PATCHLEVEL = 15
-ALPHA =
+ALPHA = a
 
 all:	Version zImage
 

drivers/FPU-emu/fpu_aux.c

@@ -17,6 +17,9 @@
 #include "control_w.h"
 
 
+static void fnop(void)
+{
+}
 
 void fclex(void)
 {
@@ -47,9 +50,16 @@ void finit()
   FPU_entry_eip = ip_offset = 0;
 }
 
+/*
+ * These are nops on the i387..
+ */
+#define feni fnop
+#define fdisi fnop
+#define fsetpm fnop
+
 static FUNC const finit_table[] = {
-  Un_impl, Un_impl, fclex, finit,
-  Un_impl, FPU_illegal, FPU_illegal, FPU_illegal
+  feni, fdisi, fclex, finit,
+  fsetpm, FPU_illegal, FPU_illegal, FPU_illegal
 };
 
 void finit_()
@@ -75,11 +85,6 @@ void fstsw_()
 }
 
 
-
-static void fnop(void)
-{
-}
-
 static FUNC const fp_nop_table[] = {
   fnop, FPU_illegal, FPU_illegal, FPU_illegal,
   FPU_illegal, FPU_illegal, FPU_illegal, FPU_illegal

drivers/char/console.c

@@ -1800,12 +1800,11 @@ int paste_selection(struct tty_struct *tty)
 	if (! *bp)
 		return 0;
 	unblank_screen();
-	while (*bp)
-	{
+	while (*bp) {
 		put_tty_queue(*bp, &tty->read_q);
 		bp++;
+		TTY_READ_FLUSH(tty);
 	}
-	TTY_READ_FLUSH(tty);
 	return 0;
 }
 

drivers/char/tty_ioctl.c

@@ -550,6 +550,9 @@ int tty_ioctl(struct inode * inode, struct file * file,
 					return set_selection(arg);
 				case 3:
 					return paste_selection(tty);
+				case 4:
+					unblank_screen();
+					return 0;
 #endif /* CONFIG_SELECTION */
 				default: 
 					return -EINVAL;

drivers/scsi/scsi.c

@@ -136,6 +136,8 @@ static struct blist blacklist[] =
    {"SEAGATE", "ST296","921"},   /* Responds to all lun */
    {"SONY","CD-ROM CDU-541","4.3d"},
    {"TANDBERG","TDC 3600","U07"},  /* Locks up if polled for lun != 0 */
+   {"TEAC","CD-ROM","1.06"},	/* causes failed REQUEST SENSE on lun 1 for seagate
+				 * controller, which causes SCSI code to reset bus.*/
    {"TEXEL","CD-ROM","1.06"},   /* causes failed REQUEST SENSE on lun 1 for seagate
 				 * controller, which causes SCSI code to reset bus.*/
    {NULL, NULL, NULL}};	

fs/buffer.c

@@ -956,7 +956,11 @@ int shrink_buffers(unsigned int priority)
 	bh = free_list;
 	i = nr_buffers >> priority;
 	for ( ; i-- > 0 ; bh = bh->b_next_free) {
-		if (bh->b_count || !bh->b_this_page)
+		if (bh->b_count) {
+			put_last_free(bh);
+			continue;
+		}
+		if (!bh->b_this_page)
 			continue;
 		if (bh->b_lock)
 			if (priority)
@@ -975,6 +979,29 @@ int shrink_buffers(unsigned int priority)
 	return 0;
 }
 
+void show_buffers(void)
+{
+	struct buffer_head * bh;
+	int found = 0, locked = 0, dirty = 0, used = 0, lastused = 0;
+
+	printk("Buffer memory:   %6dkB\n",buffermem>>10);
+	printk("Buffer heads:    %6d\n",nr_buffer_heads);
+	printk("Buffer blocks:   %6d\n",nr_buffers);
+	bh = free_list;
+	do {
+		found++;
+		if (bh->b_lock)
+			locked++;
+		if (bh->b_dirt)
+			dirty++;
+		if (bh->b_count)
+			used++, lastused = found;
+		bh = bh->b_next_free;
+	} while (bh != free_list);
+	printk("Buffer mem: %d buffers, %d used (last=%d), %d locked, %d dirty\n",
+		found, used, lastused, locked, dirty);
+}
+
 /*
  * This initializes the initial buffer free list.  nr_buffers is set
  * to one less the actual number of buffers, as a sop to backwards

fs/ext2/inode.c

@@ -69,10 +69,11 @@ void ext2_discard_prealloc (struct inode * inode)
 {
 #ifdef EXT2_PREALLOCATE
 	if (inode->u.ext2_i.i_prealloc_count) {
+		int i = inode->u.ext2_i.i_prealloc_count;
+		inode->u.ext2_i.i_prealloc_count = 0;
 		ext2_free_blocks (inode->i_sb,
 				  inode->u.ext2_i.i_prealloc_block,
-				  inode->u.ext2_i.i_prealloc_count);
-		inode->u.ext2_i.i_prealloc_count = 0;
+				  i);
 	}
 #endif
 }

include/asm/io.h

 #ifndef _ASM_IO_H
 #define _ASM_IO_H
 
+/*
+ * This file contains the definitions for the x86 IO instructions
+ * inb/inw/inl/outb/outw/outl and the "string versions" of the same
+ * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
+ * versions of the single-IO instructions (inb_p/inw_p/..).
+ *
+ * This file is not meant to be obfuscating: it's just complicated
+ * to (a) handle it all in a way that makes gcc able to optimize it
+ * as well as possible and (b) trying to avoid writing the same thing
+ * over and over again with slight variations and possibly making a
+ * mistake somewhere.
+ */
+
 /*
  * Thanks to James van Artsdalen for a better timing-fix than
  * the two short jumps: using outb's to a nonexistent port seems

init/main.c

@@ -326,6 +326,17 @@ static void parse_options(char *line)
 	envp_init[envs+1] = NULL;
 }
 
+static void copy_options(char * to, char * from)
+{
+	char c = ' ';
+
+	do {
+		if (c == ' ' && !memcmp("mem=", from, 4))
+			memory_end = simple_strtoul(from+4, &from, 0);
+		c = *(to++) = *(from++);
+	} while (c);
+}
+
 static void copro_timeout(void)
 {
 	fpu_error = 1;
@@ -351,7 +362,7 @@ asmlinkage void start_kernel(void)
 	memory_end = (1<<20) + (EXT_MEM_K<<10);
 	memory_end &= PAGE_MASK;
 	ramdisk_size = RAMDISK_SIZE;
-	strcpy(command_line,COMMAND_LINE);
+	copy_options(command_line,COMMAND_LINE);
 #ifdef CONFIG_MAX_16M
 	if (memory_end > 16*1024*1024)
 		memory_end = 16*1024*1024;

mm/memory.c

@@ -981,9 +981,6 @@ void show_mem(void)
 	printk("Free pages:      %6dkB\n",nr_free_pages<<(PAGE_SHIFT-10));
 	printk("Secondary pages: %6dkB\n",nr_secondary_pages<<(PAGE_SHIFT-10));
 	printk("Free swap:       %6dkB\n",nr_swap_pages<<(PAGE_SHIFT-10));
-	printk("Buffer memory:   %6dkB\n",buffermem>>10);
-	printk("Buffer heads:    %6d\n",nr_buffer_heads);
-	printk("Buffer blocks:   %6d\n",nr_buffers);
 	i = high_memory >> PAGE_SHIFT;
 	while (i-- > 0) {
 		total++;
@@ -998,6 +995,7 @@ void show_mem(void)
 	printk("%d free pages\n",free);
 	printk("%d reserved pages\n",reserved);
 	printk("%d pages shared\n",shared);
+	show_buffers();
 }
 
 /*

mm/mmap.c

@@ -113,9 +113,9 @@ int do_mmap(struct file * file, unsigned long addr, unsigned long len,
 		mask |= PAGE_READONLY;
 	if (prot & PROT_WRITE)
 		if ((flags & MAP_TYPE) == MAP_PRIVATE)
-			mask |= PAGE_COW;
+			mask |= PAGE_COPY;
 		else
-			mask |= PAGE_RW;
+			mask |= PAGE_SHARED;
 	if (!mask)
 		return -EINVAL;
 

net/inet/dev.c

@@ -193,81 +193,49 @@ ip_addr_match(unsigned long me, unsigned long him)
 
 
 /* Check the address for our address, broadcasts, etc. */
-int
-chk_addr(unsigned long addr)
+int chk_addr(unsigned long addr)
 {
-  struct device *dev;
-  unsigned long dst;
-
-  DPRINTF((DBG_DEV, "chk_addr(%s) --> ", in_ntoa(addr)));
-  dst = ntohl(addr);
-
-  /* Accept both `all ones' and `all zeros' as BROADCAST. */
-  if (dst == INADDR_ANY || dst == INADDR_BROADCAST) {
-	DPRINTF((DBG_DEV, "BROADCAST\n"));
-	return(IS_BROADCAST);
-  }
+	struct device *dev;
+	unsigned long mask;
 
-  /* Accept all of the `loopback' class A net. */
-  if ((dst & IN_CLASSA_NET) == 0x7F000000L) {
-	DPRINTF((DBG_DEV, "LOOPBACK\n"));
+	/* Accept both `all ones' and `all zeros' as BROADCAST. */
+	if (addr == INADDR_ANY || addr == INADDR_BROADCAST)
+		return IS_BROADCAST;
 
-	/*
-	 * We force `loopback' to be equal to MY_ADDR.
-	 */
-	return(IS_MYADDR);
-	/* return(IS_LOOPBACK); */
-  }
+	mask = get_mask(addr);
 
-  /* OK, now check the interface addresses. */
-  for (dev = dev_base; dev != NULL; dev = dev->next) {
-        if (!(dev->flags&IFF_UP))
-	        continue;
-	if ((dev->pa_addr == 0)/* || (dev->flags&IFF_PROMISC)*/)
-	        return(IS_MYADDR);
-	/* Is it the exact IP address? */
-	if (addr == dev->pa_addr) {
-		DPRINTF((DBG_DEV, "MYADDR\n"));
-		return(IS_MYADDR);
-	}
+	/* Accept all of the `loopback' class A net. */
+	if ((addr & mask) == htonl(0x7F000000L))
+		return IS_MYADDR;
 
-	/* Nope. Check for a subnetwork broadcast. */
-	if ((addr & dev->pa_mask) == (dev->pa_addr & dev->pa_mask)) {
-		if ((addr & ~dev->pa_mask) == 0) {
-			DPRINTF((DBG_DEV, "SUBBROADCAST-0\n"));
-			return(IS_BROADCAST);
+	/* OK, now check the interface addresses. */
+	for (dev = dev_base; dev != NULL; dev = dev->next) {
+		if (!(dev->flags & IFF_UP))
+			continue;
+		if ((dev->pa_addr == 0)/* || (dev->flags&IFF_PROMISC)*/)
+			return IS_MYADDR;
+		/* Is it the exact IP address? */
+		if (addr == dev->pa_addr)
+			return IS_MYADDR;
+		/* Is it our broadcast address? */
+		if ((dev->flags & IFF_BROADCAST) && addr == dev->pa_brdaddr)
+			return IS_BROADCAST;
+		/* Nope. Check for a subnetwork broadcast. */
+		if (((addr ^ dev->pa_addr) & dev->pa_mask) == 0) {
+			if ((addr & ~dev->pa_mask) == 0)
+				return IS_BROADCAST;
+			if ((addr & ~dev->pa_mask) == ~dev->pa_mask)
+				return IS_BROADCAST;
 		}
-		if (((addr & ~dev->pa_mask) | dev->pa_mask)
-						== INADDR_BROADCAST) {
-			DPRINTF((DBG_DEV, "SUBBROADCAST-1\n"));
-			return(IS_BROADCAST);
+		/* Nope. Check for Network broadcast. */
+		if (((addr ^ dev->pa_addr) & mask) == 0) {
+			if ((addr & ~mask) == 0)
+				return IS_BROADCAST;
+			if ((addr & ~mask) == ~mask)
+				return IS_BROADCAST;
 		}
 	}
-
-	/* Nope. Check for Network broadcast. */
-	if(IN_CLASSA(dst)) {
-	  if( addr == (dev->pa_addr | 0xffffff00)) {
-	    DPRINTF((DBG_DEV, "CLASS A BROADCAST-1\n"));
-	    return(IS_BROADCAST);
-	  }
-	}
-	else if(IN_CLASSB(dst)) {
-	  if( addr == (dev->pa_addr | 0xffff0000)) {
-	    DPRINTF((DBG_DEV, "CLASS B BROADCAST-1\n"));
-	    return(IS_BROADCAST);
-	  }
-	}
-	else {   /* IN_CLASSC */
-	  if( addr == (dev->pa_addr | 0xff000000)) {
-	    DPRINTF((DBG_DEV, "CLASS C BROADCAST-1\n"));
-	    return(IS_BROADCAST);
-	  }
-	}
-  }
-
-  DPRINTF((DBG_DEV, "NONE\n"));
-  
-  return(0);		/* no match at all */
+	return 0;		/* no match at all */
 }
 
 

net/inet/ip.c

@@ -764,7 +764,6 @@ static struct sk_buff *ip_glue(struct ipq *qp)
    	skb->len = (len - qp->maclen);
    	skb->h.raw = skb->data;
    	skb->free = 1;
-   	skb->lock = 1;
  
    	/* Copy the original MAC and IP headers into the new buffer. */
    	ptr = (unsigned char *) skb->h.raw;

net/inet/ip.h

@@ -78,6 +78,7 @@ extern void		ip_queue_xmit(struct sock *sk,
 				      struct device *dev, struct sk_buff *skb,
 				      int free);
 extern void		ip_retransmit(struct sock *sk, int all);
+extern void		ip_do_retransmit(struct sock *sk, int all);
 extern int 		ip_setsockopt(struct sock *sk, int level, int optname, char *optval, int optlen);
 extern int 		ip_getsockopt(struct sock *sk, int level, int optname, char *optval, int *optlen);
 

net/inet/raw.c

@@ -115,7 +115,7 @@ raw_rcv(struct sk_buff *skb, struct device *dev, struct options *opt,
   /* Now we need to copy this into memory. */
   skb->sk = sk;
   skb->len = len + skb->ip_hdr->ihl*sizeof(long);
-  skb->h.raw = skb->ip_hdr;
+  skb->h.raw = (unsigned char *) skb->ip_hdr;
   skb->dev = dev;
   skb->saddr = daddr;
   skb->daddr = saddr;

net/inet/tcp.h

@@ -124,6 +124,7 @@ extern int	tcp_rcv(struct sk_buff *skb, struct device *dev,
 
 extern int	tcp_ioctl(struct sock *sk, int cmd, unsigned long arg);
 
+extern void tcp_send_probe0(struct sock *sk);
 extern void tcp_enqueue_partial(struct sk_buff *, struct sock *);
 extern struct sk_buff * tcp_dequeue_partial(struct sock *);