must-fix, version 6

* must-fix, version 6
@ 2003-05-30 23:37 Andrew Morton
  2003-05-30 23:38 ` Andrew Morton
                   ` (5 more replies)
  0 siblings, 6 replies; 11+ messages in thread
From: Andrew Morton @ 2003-05-30 23:37 UTC (permalink / raw)
  To: linux-kernel


There are probably quite a few things here which are in progress or are
already fixed.  Could people please send updates.

I shall separate the "must fix" list from the "late features and speedups"
list.  It's a bit confusing having them combined.

I have attempted to prioritise the "late features and speedups" items along
the following lines:

	PRI1:	We're totally lame if this doesn't get in
	PRI2:	Would be nice
	PRI3:	Not very important

I basically guessed.  Feel free to argue.



ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/must-fix/



Changes since version 5:

--- /tmp/must-fix-5.txt	Fri May 30 16:29:05 2003
+++ /tmp/must-fix-6.txt	Fri May 30 16:29:12 2003
@@ -79,21 +79,21 @@
 o CD burning.  There are still a few quirks to solve wrt SG_IO and ide-cd.
 
   Jens: The basic hang has been solved (double fault in ide-cd), there still
   seems to be some cases that don't work too well.  Don't really have a
   handle on those :/
 
 o lmb: Last time I looked at the multipath code (2.5.50 or so) it also
   looked pretty broken; I plan to port forward the changes we did on 2.4
   before KS.
 
-o elevator-noop is broken.
+o loop.c: fix http://bugzilla.kernel.org/show_bug.cgi?id=192
 
 drivers/input/
 ~~~~~~~~~~~~~~
 
 o rmk: unconverted keyboard/mouse drivers (there's a deadline of 2.6.0
   currently on these remaining in my/Linus' tree.)
 
 o viro: large absence of locking.
 
 o synaptic touchpad support
@@ -231,70 +231,60 @@
   doesn't get wedged.
 
 o qlogic drivers: merge qlogicisp, feral with a view to dropping qlogicfc
   and qlogicisp
 
 o jejb: and merge the qla2xxx too
 
 fs/
 ~~~
 
-o ext3 data=journal mode is bust.
+o ext3 data=journal mode is bust.  (fix is in progress)
 
 o ext3/htree readdir can return "." and ".." in unexpected order, which
   might break buggy userspace apps.  Ted has a fix planned.
 
 
 o AIO/direct-IO writes can race with truncate and wreck filesystems.
 
-  o Easy fix is to only allow the feature for S_ISBLK files.
+  o Easy fix is to add an rwsem to the inode.
 
 o hch: devfs: there's a fundamental lookup vs devfsd race that's only
   fixable by introducing a lookup vs devfs deadlock.  I can't see how this is
   fixable without getting rid of the current devfsd design.  Mandrake seems
   to have a workaround for this so this is at least not triggered so easily,
   but that's not what I'd consider a fix..
 
 o viro: fs/char_dev.c needs removal of aeb stuff and merge of cdev-cidr. 
   In progress.
 
 o forward-port sct's O_DIRECT fixes
 
 o viro: there is some generic stuff for namei/namespace/super, but that's a
   slow-merge and can go in 2.6 just fine
 
 o andi: also soft needs to be fixed - there are quite a lot of
   uninterruptible waits in sunrpc/nfs
 
 o trond: NFS has a mmap-versus-truncate problem
 
-kernel/sched.c/
-~~~~~~~~~~~~~~~
-
-o O(1) scheduler starvation, poor behaviour seems unresolved.
-
-  Jens: "I've been running 2.5.67-mm3 on my workstation for two days, and
-  it still doesn't feel as good as 2.4.  It's not a disaster like some
-  revisisons ago, but it still has occasional CPU "stalls" where it feels
-  like a process waits for half a second of so for CPU time.  That's is very
-  noticable."
-
-   Also see Mike Galbraith's work.
-
-  Conclusion: the scheduler has issues, lots of people working on it.  Rick
-  Lindsley, Andrew Theurer.
+kernel/sched.c
+~~~~~~~~~~~~~~
 
 o "Persistent starvation"
 
   http://www.hpl.hp.com/research/linux/kernel/o1-starve.php
 
-  ingo: "this is mostly invalid".
+  ingo: "basically by calling sleep(1) in an infinite loop you can end up
+  expiring yourself.  The testcode (test-starve.c) triggers this.  This is
+  solved by going to sub-timeslices.  Which i've got done a few weeks ago and
+  it has seen some testing by others as well.
 
 o Overeager affinity in presence of repeated yields
 
   http://www.hpl.hp.com/research/linux/kernel/o1-openmp.php
 
   ingo: this is valid.  fix is in progress.
 
 o The "thud.c" test app.  This is a exploit for the interactivity
   estimator.  it's unlikely to bite in real-world cases.  Needs watching. 
   Can be ameliorated by setting nice values.
@@ -313,35 +303,49 @@
   IMHO
 
   (alan has patch)
 
 o nasty task refcounting bug is taking ages to track down.  (bugzilla ref?)
 
 o viro: core sysctl code is racy.  And its interaction wiuth sysfs
 
 o gettimeofday goes backwards.  Merge up David M-T's fixes?
 
+o Daniel Jacobowitz <dan@debian.org>: when CLONE_DETACHED threads were
+  removed from /proc several approaches were suggested to let procps find out
+  about them and none of them were implemented.  There's some real potential
+  for badness with these mostly-invisible processes.  Something needs to be
+  added so that we can display and detect them.
+
+lib/kobject.c
+~~~~~~~~~~~~~
+
+o kobject refcounting (comments from Al Viro):
+
+  _anything_ can grab a temporary reference to kobject.  IOW, if kobject is
+  embedded into something that could be freed - it _MUST_ have a destructor
+  and that destructor _MUST_ be the destructor for containing object.
+
+  Any violation of the above (and we already have a bunch of those) is a
+  user-triggerable memory corruption.
+
+  We can tolerate it for a while in 2.5 (e.g.  during work on susbsystem we
+  can decide to switch to that way of handling objects and have subsystem
+  vulnerable for a while), but all such windows must be closed before 2.6 and
+  during 2.6 we can't open them at all.
+
 mm/
 ~~~
 
 o Overcommit accounting gets wrong answers
 
-  o underestimates reclaimable slab, gives bogus failures when
-    dcache&icache are large.
-
   o gets confused by reclaimable-but-not-freed truncated ext3 pages. 
-    Lame fix exists in -mm.
-
-o Proper user level no overcommit also requires a root margin adding
-
-o There's a vmalloc race.  David Woodhouse has a patch, but it had a
-  problem.  Need to revisit it.
 
 o GFP_DMA32 (or something like that).  Lots of ideas.  jejb, zaitcev,
   willy, arjan, wli.
 
 o access_process_vm() doesn't flush right.  We probably need new flushing
   primitives to do this (davem?)
 
 
 modules
 ~~~~~~~
@@ -449,110 +453,149 @@
 
 o A couple of hundred real looking bugzilla bugs
 
 o viro: cdev rework.  Main group is pretty stable and I hope to feed it to
   Linus RSN.  That's cdev-cidr and ->i_cdev/->i_cindex stuff
 
 
 Not-ready features and speedups
 ===============================
 
+Legend:
+
+PRI1:	We're totally lame if this doesn't get in
+PRI2:	Would be nice
+PRI3:	Not very important
 
 drivers/block/
 ~~~~~~~~~~~~~~
 
 o Framework for selecting IO schedulers.  This is the main one really. 
   Once this is in place we can drop in new schedulers any old time, no risk.
 
+  PRI1
+
 o Anticipatory scheduler.  Working OK now, still has problems with seeky
   OLTP-style loads.
 
+  PRI1
+
 o CFQ scheduler.  Seems to work but Jens planning significant rework.
 
+  PRI2
+
 o cryptoloop: jmorris: There's no cryptoloop in the 2.4 mainline kernel,
   but I think every distro ships some version.  It would probably be useful
   to have crypto natively supported in 2.6, with backward compatibility for
   the majority of 2.4 users.
 
   problem: lack of a loop maintainer
 
+  PRI2
+
 o viro: paride drivers need a big cleanup
 
+  PRI2
+
 drivers/char/rtc/
 ~~~~~~~~~~~~~~~~~
 
-o rmk: I think we need a generic RTC driver (which is backed by real RTCs).
-   Integrator-based stuff has a 32-bit 1Hz counter RTC with alarm, as has the
-  SA11xx, and probably PXA.  There's another implementation for the RiscPC
-  and ARM26 stuff.  I'd rather not see 4 implementations of the RTC userspace
-  API, but one common implementation so that stuff gets done in a consistent
-  way.
-
-  We postponed this at the beginning of 2.4 until 2.5 happened.  We're now
-  at 2.5, and I'm about to add at least one more (the Integrator
-  implementation.) This isn't sane imo.
+o rmk, trini: add support for alarms to the existing generic rtc driver.
+
+  PRI2
 
 device mapper
 ~~~~~~~~~~~~~
 
 o ioctl interface cleanup patch is ready (redo the structure layouts)
 
+  PRI1
+
 o A port of the 2.4 snapshot target is in progress
 
+  PRI1
+
 o the fs interface to dm needs to be redone.  gregkh was going to work on
   this.  viro is interested in seeing work thus-far.
 
+  PRI2
+
 drivers/net/wireless/
 ~~~~~~~~~~~~~~~~~~~~~
 
   (Jean Tourrilhes <jt@bougret.hpl.hp.com>)
 
 o get latest orinoco changes from David.
 
+  PRI1
+
 o get the latest airo.c fixes from CVS.  This will hopefully fix problems
   people have reported on the LKML.
 
+  PRI1
+
 o get HostAP driver in the kernel.  No consolidation of the 802.11
   management across driver can happen until this one is in (which is probably
   2.7.X material).  I think Jouni is mostly ready but didn't find time for
   it.
 
+  PRI2
+
 o get more wireless drivers into the kernel.  The most "integrable" drivers
   at this point seem the NWN driver, Pavel's Spectrum driver and the Atmel
   driver.
 
+  PRI1
+
 o The last two drivers mentioned above are held up by firmware issues (see
   flamewar on LKML a few days ago).  So maybe fixing those firmware issues
   should be a requirement for 2.6.X, because we can expect more wireless
   devices to need firmware upload at startup coming to market.
 
+  (in progress?)
+
+  PRI1
+
 drivers/usb/gadget/
 ~~~~~~~~~~~~~~~~~~~
 
 o rmk: SA11xx USB client/gadget code (David B has been doing some work on
   this, and keeps trying to prod me, but unfortunately I haven't had the time
   to look at his work, sorry David.)
 
+  PRI3
+
 fs/
 ~~~
 
 o ext3 lock_kernel() removal: that part works OK and is mergeable.  But
   we'll also need to make lock_journal() a spinlock, and that's deep surgery.
 
+  Patches exist in -mm.
+
+  PRI1
+
 o ext3 and ext2 block allocators have serious failure modes - interleaved
   allocations.
 
+  PRI3
+
 o 32bit quota needs a lot more testing but may work now
 
+  PRI2
+
 o Integrate Chris Mason's 2.4 reiserfs ordered data and data journaling
   patches.  They make reiserfs a lot safer.
 
+  Ordered: PRI2
+  data journalled: PRI3
+
 o (Trond:) Yes: I'm still working on an atomic "open()", i.e.  one
            where we short-circuit the usual VFS path_walk() + lookup() +
            permission() + create() + ....  bullsh*t...
 
            I have several reasons for wanting to do this (all of
            them related to NFS of course, but much of the reasoning applies
            to *all* networked file systems).
 
    1) The above sequence is simply not atomic on *any* networked
       filesystem.
@@ -567,295 +610,427 @@
       doesn't pass an 'EXCLUSIVE' flag down to the filesystems.
 
    4) (NFS specific?) open() has very different cache consistency
       requirements when compared to most other VFS operations.
 
    I'd very much like for something like Peter Braam's 'lookup with
    intent' or (better yet) for a proper dentry->open() to be integrated with
    path_walk()/open_namei().  I'm still working on the latter (Peter has
    already completed the lookup with intent stuff).
 
+   PRI2 (?)
+
+o (Chuck Lever <cel@citi.umich.edu>): NFS O_DIRECT support must be
+  completed.  The best approach is to fall back to something like the 2.4 NFS
+  O_DIRECT support, which issues RPCs synchronously and uses the RPC
+  completion mechanism to wait for I/O completion.
+
+  PRI2
+
 o rmk: update acorn partition parsing code - making all acorn schemes
   appear in check.c so we don't have to duplicate the scanning of multiple
   types, and adding support for eesox partitions.
 
+  PRI2
+
 o atomic i_size patches
 
+  PRI1
+
 o viro: cleaning up options-parsers in filesystems.  (patch exists, needs
   porting).
 
+  PRI2
+
 o aio: fs IO isn't async at present.  suparna has restart patches, they're
   in -mm.  Need to get Ben to review/comment.
 
+  PRI1.
 
 kernel/
 ~~~~~~~
 
 o rusty: Zippel's Reference count simplification.  Tricky code, but cuts
   about 120 lines from module.c.  Patch exists, needs stressing.
 
+  PRI3
+
 o rusty: /proc/kallsyms.  What most people really wanted from /proc/ksyms. 
   Patch exists.
 
+  PRI3
+
 o rusty: Fix module-failed-init races by starting module "disabled".  Patch
   exists, requires some subsystems (ie.  add_partition) to explicitly say
   "make module live now".  Without patch we are no worse off than 2.4 etc.  
 
+  PRI1
+
 o Integrate userspace irq balancing daemon.
 
-o kexec.  Seems to work, is in -mm.
+  PRI2
+
+o kexec.  Seems to work, was in -mm.
+
+  PRI3
 
 o rmk: modules / /proc/kcore / vmalloc This needs sorting and testing to
   ensure that stuff like gdb vmlinux /proc/kcore works as expected.  I
   believe this is the only show stopper preventing any ARM platform being
   built in Linus' kernel.
 
+  Patch exists in -mm, nobody has tested it for the above afaik.
+
+  PRI1
+
 o kcore is a problem for ia64 (Tony Luck)
 
+  Patch exists in -mm.
+
+  PRI1
+
 o rmk: lib/inflate.c must not use static variables (causes these to be
   referenced via GOTOFF relocations in PIC decompressor.  We have a PIC
   decompressor to avoid having to hard code a per platform zImage link
   address into the makefiles.)
 
+  PRI2
+
 o klibc merge?
 
+  PRI2
+
 mm/
 ~~~
 
 o objrmap: concerns over page reclaim performance at high sharing levels,
   and interoperation with nonlinear mappings is hairy.
 
 o Reintroduce and make /proc/sys/vm/freepages writable again so that boxes
   can be tuned for heavy interrupt load.
 
+  Patch exists in -mm.
+
+  PRI1
+
 o oxymoron's async write-error-handling patch
 
+  PRI1
+
+o dropbehind for large files
+
+  PRI2
+
 net/
 ~~~~
 
   (davem)
 
 o Real serious use of IPSEC is hampered by lack of MPLS support.  MPLS is a
   switching technology that works by switching based upon fixed length labels
   prepended to packets.  Many people use this and IPSEC to implement VPNs
   over public networks, it is also used for things like traffic engineering.
 
   A good reference site is:
 
 	http://www.mplsrc.com/
 
   Anyways, an existing (crappy) implementation exists.  I've almost
   completed a rewrite, I should have something in the tree next week.
 
+  PRI1
+
 o Sometimes we generate IP fragments when it truly isn't necessary.
 
   The way IP fragmentation is specified, each fragment must be modulo 8
   bytes in length.  So suppose the device has an MTU that is not 0 modulo 8,
   ethernet even classifies in this way.  1500 == (8 * 187) + 4
 
   Our IP fragmenting engine can fragment on packets that are sized within
   the last modulo 8 bytes of the MTU.  This happens in obscure cases, but it
   does happen.
 
   I've proposed a fix to Alexey, whereby very late in the output path we
   check the packet, if we fragmented but the data length would fit into the
   MTU we unfragment the packet.
 
   This is low priority, because technically it creates suboptimal behavior
   rather than mis-operation.
 
+  PRI1
+
 net/*/netfilter/
 ~~~~~~~~~~~~~~~~
 
 o Lots of misc. cleanups, which are happening slowly.
 
+  PRI2
+
 o davem: Netfilter needs to stop linearizing packets as much as possible.
 
   Zerocopy output packets are basically undone by netfilter becuase all of
   it assumed it was working with linear socket buffers.
 
   Rusty is fixing this piece by piece.  He is nearly done with this work. 
 
+  PRI1
+
 power management
 ~~~~~~~~~~~~~~~~
 
   (Pat) There is some preliminary work at bk://ldm.bkbits.net/linux-2.5-power,
   though I'm currently in the process of reworking it.  
 
   It includes: 
 
 o New device power management core code, both for individual devices, 
   and for global state transitions. 
 
+  PRI1
+
 o A generic user interface for triggering system power state transitions.
 
+  PRI1
+
 o Arch-independent code for performing state transitions, that calls 
   platform-specific methods along the way. 
 
+  PRI1
+
 o A better suspend-to-disk mechanism than swsusp. 
 
   There are various other details to be worked out, which are the real fun
   part.  And of course, driver support, but that is something that can happen
   at any time.  
 
   (Alan)
 
+  PRI2
+
 o Frame buffer restore codepaths (that requires some deep PCI magic)
 
+  PRI2
+
 o XFree86 hooks
 
+  PRI2
+
 o AGP restoration
 
+  PRI2
+
 o DRI restoration
 
   (davej/Alan: not super-critical, can crash laptop on restore.  davej
   looking into it.)
 
+  PRI2
+
 o IDE suspend/resume without races (Ben is looking at this a little)
 
+  PRI2
+
 o Pat: There are already CPU device structures; MTRRs should be a
   dynamically registered interface of CPUs, which implies there needs
   to be some other glue to know that there are MTRRs that need to be
   saved/restored.
 
+  PRI1
+
 global
 ~~~~~~
 
 o 64-bit dev_t.  Seems almost ready, but it's not really known how much
   work is still to do.  Patches exist in -mm but with the recent rise of the
   neo-viro I'm not sure where things are at.
 
+  PRI1
+
 o We need a kernel side API for reporting error events to userspace (could
   be async to 2.6 itself)
 
   (Prototype core based on netlink exists)
 
+  PRI2
+
 o Kai: Introduce a sane, easy and standard way to build external modules
 
+  PRI2
+
 o Kai: Allow separate src/objdir
 
+  PRI2
+
 o general confusion over firmware policy:
 
   o do we mandate that it be uploaded from userspace?
 
   o Is binary-blob-in-kernel-image OK?
 
   o Each driver (wireless, scsi, etc) seems to do it in a different,
     private manner.
 
   gregkh: patch exists, drivers can be ported to use new infrastructure at
   any time.
 
+  PRI1
+
 o larger cpumask_t - supporting more than BITS_PER_LONG CPUs.
 
   wli: patch exists.  ia32, ppc are done.  ppc64 in progress.  Needs work
   for other architectures.
 
+  PRI1
+
+o pavel: ioctl32 emulation should be shared across architectures.  (patch
+  exists).
+
+  PRI2
+
 drivers
 ~~~~~~~
 
-o Some network drivers don't even build
-
 o Alan: Cardbus/PCMCIA requires all Russell's stuff is merged to do
   multiheader right and so on
 
+  PRI1
+
 drivers/acpi/
 ~~~~~~~~~~~~~
 
-o davej: ACPI has a number of failures right now.  There are a number of
-  entries in bugzilla which could all be the same bug.  It manifests as a
-  "network card doesn't recieve packets" booting with 'acpi=off noapic' fixes
-  it.
-
-  alan: VIA APIC stuff is one bit of this, there are also some other
+o alan: VIA APIC stuff is one bit of this, there are also some other
   reports that were caused by ACPI not setting level v edge trigger some
   times
 
-o davej: There's also another nasty 'doesnt boot' bug which quite a few
-  people (myself included) are seeing on some boxes (especially laptops).
+  PRI1
 
 o mochel: it seems the acpi irq routing code could use a serious rewrite.
 
+  grover: The problem is the ACPI irq routing code is trying to piggyback
+  on the existing MPS-specific data structures, and it's generally a hack. 
+  So yes mochel is right, but it is also purging MPS-ities from common code
+  as well.  I've done some preliminary work in this area and it doesn't seem
+  to break anything (yet) but a rewrite in this area imho should not be
+  rushed out the door.  And, I think the above bugs can be fixed w/o the
+  rewrite.
+
+  PRI2
+
 o mochel: ACPI suspend doesn't work.  Important, not cricital.  Pat is
   working it.
 
+  PRI2
+
 drivers/block/
 ~~~~~~~~~~~~~~
 
 o Floppy is almost unusably buggy still
 
   akpm: we need more people to test & report.
 
+  alan: "Floppy has worked for me since the patches that went in 2.5.69-ac
+  and I think -bk somewhere"
+
+  PRI1
+
 drivers/char/
 ~~~~~~~~~~~~~
 
 o Alan: Multiple serious bugs in the DRI drivers (most now with patches
   thankfully).  "The badness I know about is almost entirely IRQ mishandling.
    DRI failing to mask PCI irqs on exit paths."
 
-  (might be fixed due to DRI updates?)
+  (This is understood and fixed in DRI CVS)
+
+  PRI1
 
 o Various suspect things in AGP.
 
+  PRI1
+
 drivers/ide/
 ~~~~~~~~~~~~
 
   (Alan)
 
 o IDE requires bio walking
 
   "Bartlomiej has IDE multisector working" (does that mean it's fixed?)
 
+  PRI1
 
 o IDE PIO has occasional unexplained PIO disk eating reports
 
+  PRI1
+
 o IDE has multiple zillions of races/hangs in 2.5 still
 
+  PRI1
+
 o IDE scsi needs rewriting
 
+  PRI2
+
 o IDE needs significant reworking to handle Simplex right
 
+  PRI2
+
 o IDE hotplug handling for 2.5 is completely broken still
 
+  PRI2
+
 o There are lots of other IDE bugs that wont go away until the taskfile
   stuff is included, the locking bugs that allow any user to hang the IDE
   layer in 2.5, and some other updates are forward ported.  (esp.  HPT372N).
 
+  PRI1
+
 drivers/isdn/
 ~~~~~~~~~~~~~
 
   (Kai, rmk)
 
 o isdn_tty locking is completely broken (cli() and friends)
 
+  PRI2
+
 o fix lots of remaining bugs in the isdn link layer / hisax protocol layer
   / hisax subdrivers, so that at least 99% of the users have a usable ISDN
   subsystem
 
+  PRI1
+
 o fix other drivers
 
+  PRI2
+
 o lots more cleanups, adaption to recent APIs etc
 
+  PRI3
+
 o fixup tty-based ISDN drivers which provide TIOCM* ioctls (see my recent
   3-set patch for serial stuff)
 
   Alternatively, we could re-introduce the fallback to driver ioctl parsing
   for these if not enough drivers get updated.
 
+  PRI3
+
 drivers/net/
 ~~~~~~~~~~~~
 
 o davej: Either Wireless network drivers or PCMCIA broke somewhen.  A
   configuration that worked fine under 2.4 doesn't receive any packets.  Need
   to look into this more to make sure I don't have any misconfiguration that
   just 'happened to work' under 2.4
 
+  PRI1
 
 drivers/scsi/
 ~~~~~~~~~~~~~
 
 o qlogic follies:
 
   - jejb: Merge the feral driver.  It covers all qlogic chips: 1020 all
     the way up to 23xxx.  mjacob is promising a "major" rewrite which
     eliminates this as a candidate for immediate inclusion.  Panics on my
     parisc hardware, works on my ia64.  BK tree is
@@ -866,81 +1041,193 @@
     until I at least see how Qlogic responds to the issues.  Can't currently
     build this for my only fibre card (a qla2100).  BK tree is at
     http://linux-scsi.bkbits.net/scsi-qla2xxx-2.5
 
   - I think the best plan currently is not to merge either of these, but
     keep shadow BK trees for them (thus holding out the possibility of
     merger) to see how they evolve.  I agree with hch that feral seems to be
     in the better shape but, barring directions to the contrary, I can't see
     why both shouldn't be included eventually.
 
+  PRI2
+
 arch/i386/
 ~~~~~~~~~~
 
 o Also PC9800 merge needs finishing to the point we want for 2.6 (not all).
 
+  PRI3
+
 o ES7000 wants merging (now we are all happy with it).  That shouldn't be a
   big problem.
 
+  PRI2
+
 o davej: PAT support (for mtrr exhaustion w/ AGP)
 
+  PRI2
+
 o 2.5.x won't boot on some 440GX
 
   alan: Problem understood now, feasible fix in 2.4/2.4-ac.  (440GX has two
   IRQ routers, we use the $PIR table with the PIIX, but the 440GX doesnt use
   the PIIX for its IRQ routing).  Fall back to BIOS for 440GX works and Intel
   concurs.
 
+  PRI1
+
 o 2.5.x doesn't handle VIA APIC right yet.
 
   1. We must write the PCI_INTERRUPT_LINE
 
   2. We have quirk handlers that seem to trash it.
 
+  PRI1
+
 o ACPI needs the relax patches merging to work on lots of laptops
 
+  alan: ACPI relax stuff is in 2.4-ac, compaq workaround is in next -ac
+  coming.  These seem to deliver the goods - toshibas now work a treat.  Some
+  other relax bits are being discussed (assume local0 starts 0 etc) and
+  progress looks great.  This can occur before 2.6 or during.
+
+  PRI1
+
 o ECC driver questions are not yet sorted (DaveJ is working on this) (Dan
   Hollis)
 
+  alan: ECC - I have some test bits from Dan's stuff - they need no kernel
+  core changes for most platforms.  That means we can treat it as a random
+  driver merge.
+
+  PRI3
+
+o alan: 2.4 has some fixes for tsc handling bugs.  One where some bioses in
+  SMM mode mess up our toggle on the time high/low or mangle the counter and
+  one where a few chips need religious use of _p for timer access and we
+  don't do that.  This is forward porting little bits of fixup.
+
+  ACPI HZ stuff we can't trap - a lot of ACPI is implemented as outb's
+  triggering SMM traps
+
+  PRI1
+
 arch/x86_64/
 ~~~~~~~~~~~~
 
   (Andi)
 
 o time handling is broken. Need to move up 2.4 time.c code.
 
+  PRI1
+
 o Another report of a crash at shutdown on Simics with no iommu when all
   memory was used.  Could be related to the one above.
 
+  PRI1
+
 o NMI watchdog seems to tick too fast
 
+  PRI2
+
 o not very well tested. probably more bugs lurking.
 
+  PRI1
+
 o need to coredump 64bit vsyscall code with dwarf2
 
+  PRI2
+
 o move 64bit signal trampolines into vsyscall code and add dwarf2 for it.
 
+  PRI1
+
 o describe kernel assembly with dwarf2 annotations for kgdb (currently
   waiting on some binutils changes for this) 
 
+  PRI3
+
 arch/alpha/
 ~~~~~~~~~~~
 
 o rth: Ptrace writes are broken.  This means we can't (reliably) set
   breakpoints or modify variables from gdb.
 
+  PRI1
+
 arch/arm/
 ~~~~~~~~~
 
 o rmk: missing raw keyboard translation tables for all ARM machines. 
   Haven't even looked into this at all.  This could be messy since there
   isn't an ARM architecture standard.  I'm presently hoping that it won't be
   an issue.  If it does, I guess we'll see drivers/char/keyboard.c explode.
 
+  PRI2
+
 arch/others/
 ~~~~~~~~~~~~
 
 o SH/SH-64 need resyncing, as do some other ports.  No impact on
   mainstream platforms hopefully.
 
+  PRI2
+
 o IA64 needs merging, has impact on core code
 
+  PRI1
+
+arch/s390/
+~~~~~~~~~
+
+o A nastly memory management problem causes random crashes.  These appear
+  to be fixed/hidden by the objrmap patch, more investigation is needed.
+
+  PRI1
+
+drivers/s390/
+~~~~~~~~~~~~~
+
+o Early userspace and 64 bit dev_t will allow the removal of most of
+  dasd_devmap.c and dasd_genhd.c.
+
+  PRI2
+
+o The 3270 console driver needs to be replaced with a working one
+  (prototype is there, needs to be finished).
+
+  PRI2
+
+o Minor interface changes are pending in cio/ when the z990 machines are
+  out.
+
+  There are some more things being worked on that are either post-2.6.0 or
+  are likely to remain outside of the official kernel (i.e.  not for your
+  list):
+
+  PRI3
+
+o Jan Glauber is working on a fix for the timer issues related to running
+  on virtualized CPUs (wall-clock vs.  cpu time).
+
+  PRI1
+
+o new zfcp fibre channel driver
+
+  PRI3
+
+o the qeth driver will become GPL soon
+
+  PRI3
+
+o a block device driver for ramdisks shared among virtual machines
+
+  PRI3
+
+o driver for crypto hardware
+
+  PRI2
+
+o 'claw' network device driver
+
+  PRI3
+


^ permalink raw reply	[flat|nested] 11+ messages in thread