Import of Linus's Linux 1.1.68

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+CHANGES since 0.99 patchlevel 15:
+
+ - removed all the bugs, of course.
+ - networking fixes.
+ - more changes than I really wanted..
+
+CHANGES since 0.99 patchlevel 14:
+
+ - too many to count, really.  Besides, I've lost my notes. 
+
+CHANGES since 0.99 patchlevel 13:
+
+ - new kernel source layout: drivers separated
+ - lots of networking bugs fixed, and new network card drivers (Alan Cox,
+   Donald Becker &co)
+ - sound driver added to the default source distribution (Hannu
+   Savolainen)
+ - updated SCSI driver code (Eric Youngdale, Drew Eckhardt &co)
+ - readonly OS/2 filesystem support (HPFS) added (Chris Smith)
+ - NTP support (Philip Gladstone, Torsten Duwe, ??)
+ - fixed 16MB swap-area limit
+ - lots of minor cleanups, bugfixes etc.
+
+CHANGES since 0.99 patchlevel 12 and earlier:
+
+ - the bad memory management one-liner bug in pl12 is naturally fixed.
+ - compiled with plain C by default instead of C++
+ - ELF binary support (Eric Youngdale)
+ - Quickport mouse support (and some changes to the PS/2 mouse driver)
+   by Johan Myreen and co)
+ - core file name change ("core" -> "core.xxxx" where xxxx is the name
+   of the program that dumped code).  Idea from ???.  Also, core-files
+   now correctly truncate any existing core file before being written.
+ - some mmap() fixes: better error returns, and handling of non-fixed
+   maps for /dev/mem etc.
+ - one kludgy way to fix the wrong arp packets that have plagued net-2d
+   (resulting in arp packets that had the first four bytes of the
+   ethernet address as the IP address).
+ - I fixed the mount-point handling of 'rename()' and 'unlink()/rmdir()'
+   so that they should now work and/or give appropriate error messages.
+   An early version of this patch was already sent to the KERNEL
+   channel, which fixed the rename problem but not a similar bug with
+   unlink.
+ - packet mode fixes by Charles Hedrick.  Sadly, these are likely to
+   break old telnet/rlogin binaries, but it had to be done in order to
+   communicate correctly with the rest of the world.
+ - FPU emulator patches from Bill Metzenthen.  The fprem1 insn should be
+   correct now (not that anybody seems to have seen the incorrect
+   behaviour..)
+ - a few fixes for SCSI (Drew and Eric)
+ - signal.c changes to handle multiple segments (for Wine) correctly.
+ - updated drivers from Donald Becker: 3c509 and AT1500 drivers, but
+   also some other drivers have been edited, and some networking fixes.
+
+CHANGES since 0.99 patchlevel 11 and earlier:
+
+ - The memory manager cleanup has continued, and seems to be mostly
+   ready, as proven by the ease of adding mmap() over NFS with the new
+   routines.  So yes, the pl12 kernel will demand-load your binaries
+   over NFS, sharing code and clean data, as well as running shared
+   libraries over NFS.  Memory management by Eric and me, while the NFS
+   mmap code was written by Jon Tombs,
+
+ - ** IMPORTANT **: The keyboard driver has been enhanced even further,
+   and almost everything is completely re-mappable.  This means that
+   there is a new version of 'loadkeys' and 'dumpkeys' that you must use
+   with this kernel or you'll have problems.  The default keyboard is
+   still the US mapping, but if you want to create your own mappings
+   you'll have to load them with the new binaries.  Get the 'kbd.tar.gz'
+   archive from the same place you get the kernel.
+
+   The new keymappings allow things like function key string changes,
+   remapping of the control keys, and freedom to remap any of the normal
+   keyboard functions: including special features like rebooting,
+   console switching etc.  The keyboard remapping code has been done
+   mostly by Risto Kankkunen (Risto.Kankkunen@Helsinki.FI).
+
+ - updated network drivers by Donald Becker
+
+ - updated serial drivers - tytso@Athena.mit.edu
+
+ - updated 387 emulation (Bill Metzenthen).  The updated emulator code
+   has more exact trigonometric functions and improved exception
+   handling.  It now behaves very much like a real 486, with only small
+   changes (greater accuracy, slightly different denormal NaN handling
+   etc - hard to detect the differences even if you are looking for
+   them).
+
+ - network timer fixes by Florian La Roche (much cleaned up net/inet/timer.c
+   and some bad race-conditions fixed).
+
+ - Scsi code updates by Eric Youngdale and others
+
+ - Sony CDU-31A CDROM driver by Corey Minyard added to the standard
+   kernel distribution.
+
+ - The Mitsumi CDROM driver is now part of the standard kernel.  Driver
+   by Martin Harriss with patches by stud11@cc4.kuleuven.ac.be (yes, he
+   probably has a real name, but no, I haven't found it) and Jon Tombs.
+
+ - various other minor patches (preliminary ldt support etc)
+
+NOTABLE changes since patchlevel 10 or earlier:
+
+ - The memory manager has been cleaned up substantially, and mmap()
+   works for MAP_PRIVATE.  MAP_SHARED is still not supported for
+   anything else than /dev/mem, but even so it actually is usable for a
+   lot of applications.  The shared library routines have been rewritten
+   to use mmap() instead of the old hardcoded behaviour.
+
+ - The kernel is now compiled with C++ instead of plain C.  Very few
+   actual C++ features are used, but even so C++ allows for more
+   type-checking and type-safe linkage.
+
+ - The filesystem routines have been cleaned up for multiple block
+   sizes.  None of the filesystems use it yet, but people are working on
+   it.
+
+ - named pipes and normal pipes should hopefully have the right select()
+   semantics in the presence/absence of writers.
+
+ - QIC-02 tape driver by Hennus Bergman
+
+ - selection patches in the default kernel
+
+ - fixed a bug in the pty code which led to busy waiting in some
+   circumstances instead of sleeping.
+
+ - Compressed SLIP support (Charles Hedrick). See net/inet/CONFIG
+
+ - the 'clear_bit()' function was changed to return the previous setting
+   of the bit instead of the old "error-code".  This makes use of the
+   bit operations more logical.
+
+ - udelay() function for short delays (busy-waiting) added.  Used
+   currently only by the QIC driver.
+
+ - fork() and scheduler changes to make task switches happen only from
+   kernel mode to kernel mode.  Cleaner and more portable than the old
+   code which counted on being able to task-switch directly into user
+   mode.
+
+ - debugging malloc code.