fix gconf segfault problem (by Romain Lievin <roms@tilp.info>)

generate an error if writing of kernel config failed

The old 50ms / 30ms timeouts apparently weren't sufficient
with some disks.

The reworked firmware loader in the DVB patches needs the fix to the
call_usermodehelper() return value. 

From: Rusty Russell <rusty@rustcorp.com.au>

MODULE_ALIAS_BLOCK() and MODULE_ALIAS_CHAR() define aliases of form
"XXX-<major>-<minor>", so we should probe for modules using this form.
Unfortunately in 2.4, block aliases were "XXX-<major>" and char aliases
were of both forms.

Ideally, all modules would now be using MODULE_ALIAS() macros to define
their aliases, and the old configuration files wouldn't matter as much. 
Unfortunately, this hasn't happened, so we make request_module() return the
exit status of modprobe, and then do fallback when probing for char and
block devices.

(Kudos to Chris Wright, I stole his kernel_thread flags).

From: David Hinds <dhinds@sonic.net>

This removes dead PCI-related code from the i82365 driver.

From: David Hinds <dhinds@sonic.net>

This changes the PCMCIA CIS parsing code to use kmalloc() rather than
allocating some data structures on the kernel stack.

From: David Hinds <dhinds@sonic.net>

This fixes interrupt allocation for 16-bit PCMCIA cards, so that on systems
supporting ISA bus interrupts, if all ISA interrupts are unavailable, we'll
fall back on sharing the bridge PCI interrupt.

From: David Hinds <dhinds@sonic.net>

This fixes half/full duplex selection for certain NE2000 compatible PCMCIA
cards.

From: David Hinds <dhinds@sonic.net>

This just sets missing logging levels for printk's in yenta_socket.

From: David Hinds <dhinds@sonic.net>

I have not been actively maintaining PCMCIA for 2.6; I tried asking the
more active developers to see if someone would step into the job but they
were not willing to do so at this time.  I'll still submit patches from
time to time.

(David has a ./CREDITS entry, of course).

We should really put in Russell King here, but I'll let him do that
himself.

From: Tom Rini <trini@kernel.crashing.org>
      Peter Wahl <PeterWahl@web.de>

PPC32: Fix the mkprep util to work correctly on Solaris 8.

- There is a very odd problem with the alignment of dword_t values
  which causes this program to not work correctly when compiled on
  Solaris 8.  The workaround is not use a pointer and to memcpy the
  values instead.

From: Tom Rini <trini@kernel.crashing.org>

Fix compilation of arch/ppc/kernel/ppc_ksyms.c on !CONFIG_PPC_STD_MMU

'mol_trampoline' is only defined on CONFIG_PPC_STD_MMU.  Therefore this file
will not compile on !CONFIG_PPC_STD_MMU without this change.

From: Tom Rini <trini@kernel.crashing.org>

The following patch fixes the 'znetboot' and 'znetbootrd' targets so that
they work again.

- Update the comments to reflect how things work with the correct
  usages now.

- Fix the znetboot / znetbootrd targets.  We now always set end-y,
  and use this to figure out what image will be tftpboot'ed.

From: Tom Rini <trini@kernel.crashing.org>

Currently a number of Motorola PPC32 machine will not boot, as the final
zImage isn't built correctly for them.

into home.osdl.org:/home/torvalds/v2.5/linux

into home.osdl.org:/home/torvalds/v2.5/linux

into debian.org:/usr/src/kernel/linux-2.6

into home.osdl.org:/home/torvalds/v2.5/akpm

From: James Bottomley <James.Bottomley@SteelEye.com>

The compiler justly complains in this:

	        unsigned int regnr = *(loff_t *) v, i;

	        if (regnr == 0) {
	                seq_puts(p, "     ");
	#ifdef CONFIG_SMP
	                for (i = 0; i < NR_CPUS; i++)
	#endif
	                        seq_printf(p, "      CPU%02d ", i);

That i is uninitialised if CONFIG_SMP is not set.

From: Ram Pai <linuxram@us.ibm.com>

I have enclosed a patch that fixes a bunch of performance bugs in the
readahead code.

Below is a brief summary of the problems noticed and the proposed fixes
with some results:
   
 Problem 1:  Readahead code closes the readahead window and goes into
 slowread path, if a file is accessed the first time at an offset
 notequal to zero.  In the case of databases(especially in db2), a file
 may not be accessed at offset 0 the first time though the i/o's are
 sequential.

 Fix to Problem 1:
          min = get_min_readahead(ra);
         orig_next_size = ra-next_size;

 -       if (ra-next_size == 0 && offset == 0) {
 +       if (ra-next_size == 0) {

------------------------------------------------------------------------

 ------------------------------------------------------------------------
 Problem 2: After fixing Problem, the readahead window still does not
 open up the first time, if all the pages requested are already in the
 page cache. This time the window closes because of pagecache hits
 instead of misses. To fix this we put in these changes.

 -               check_ra_success(ra, ra-size, actual, orig_next_size);
 +               if(!first_access) {
 +                       check_ra_success(ra, ra-size, actual, orig_next_size);
 +               }

 ------------------------------------------------------------------------

 ------------------------------------------------------------------------
 Problem 3: In the case of large random reads, the readahead window is
 read in, the moment there is a hit in the active window. And it turns
 out that in most of the cases the readahead window gets scrapped,
 because the next large random read does not even touch any of the pages
 in that readahead window. We fixed this by introducing lazy readahead.
 Basically we wait till the last page in the active window gets a hit.
 And once the last page is hit, the readahead window is then read in.
 This fix gave a tremendous boost in the performance.
 To fix this the changes we put in were:

                 /*
                  * This read request is within the current window.  It is time
                  * to submit I/O for the ahead window while the application is
                  * crunching through the current window.
                  */
 -               if (ra-ahead_start == 0) {
 +               if (ra-ahead_start == 0 && offset == (ra-start + ra-size -1)) {

 ------------------------------------------------------------------------

 ------------------------------------------------------------------------
 Problem 4:
       If the request page does not fall in the active window and is not
the  first page of the read ahead window, we scrap both the active
window and the readahaed window and read in the active window. But it
turns out that we read in a lot of pages in the active window based on
the size of the 'projected readahead window size' (the next_size
variable). And we end up using part of the active window and waste the
remaining. We put  in a fix where we read in just as many pages in the
active window based on the number of pages used in the recent past.
 Again this gave us another big boost in performance and ended up
beating the performance of aio patch on a DSS workload.

 The fix to this is:
                  * ahead window and get some I/O underway for the new
                  * current window.
                  */
 +               if (!first_access && preoffset = ra-start &&
 +                               preoffset < (ra-start + ra-size)) {
 +                       ra-size = preoffset - ra-start + 2;
 +               } else {
 +                       ra-size = ra-next_size;

 ------------------------------------------------------------------------

 ------------------------------------------------------------------------
 Problem 5:
 With all the above fixes there is very low chance that the readahead
 window shall close.  But however if it does, we found that the slow
 read  path is really slow.  Any loss of sequentiality in the slow read
 path is penalized heavily by closing the window back to zero. So we
 fixed this  by decreasing the window size by one anytime we loose
 sequentiality and  increasing in by 1 if we didn't.

                 if (offset != ra-prev_page + 1) {
 -                       ra-size = 0;            /* Not sequential */
 +                       ra-size = ra-size?ra-size-1:0; /*Notsequential */

 ------------------------------------------------------------------------

With the above set of fixes we got about 28% improvement in DSS workload
which is about 5% more than what we got with the suparna's aio patch.

This patch compared equivalent to suparna's aio patch with aio-stress
run.

It fared better than aio patch for large random io.

We are yet to run a bunch of other benchmarks to evaluate this patch.
We would like to get your inputs on this patch and any suggestions you
may have to improve it. I have enclosed a patch with all these changes
along with some changes to the comments that reflect the new behaviour.
NOTE: the above patch reverts suparna's aio patch.

From: Hans Ulrich Niedermann <linux-kernel@n-dimensional.de>

I've noted that 2.6.0 contains broken references to documentation.

I got sufficiently annoyed chasing doc files in the wrong place
that I wrote a script to check the references to documentation
files.

Some documentation files have moved (e.g.  Documentation/modules.txt to
Documentation/kbuild/modules.txt).  I adapted the references with a script.

From: Nikita Danilov <Nikita@Namesys.COM>

This patches reiserfs_rename.  It adds ctime update of renamed object.  It
also fixes calculation of maximal possible transaction size during rename.

Thanks to Alex Adriaanse <alex_a@caltech.edu> for finding this.

From: Nikita Danilov <Nikita@Namesys.COM>

Add "commit" reiserfs mount option to override maximal transaction age. 
Usage:

mount -treiserfs -ocommit=<time-in-seconds> /device /mountpoint

Submitted by Hugang <hugang@soulinfo.com>.

From: Nikita Danilov <Nikita@Namesys.COM>

Patch to teach fs/reiserfs/super.c:reiserfs_fill_super() to respect @silent
parameter and to not issue any output if @silent is set.

Also remove some trailing white spaces, while we are here.

From: Muli Ben-Yehuda <mulix@mulix.org>

It's messy, and needs describing.

From: BlaisorBlade <blaisorblade_spam@yahoo.it>

This fixes a "typo" for Kconfig-language docs.

wli points out that shrink_slab inverts the sense of shrinker->seeks: those
caches which require more seeks to reestablish an object are shrunk harder.
That's wrong - they should be shrunk less.

So fix that up, but scaling the result so that the patch is actually a no-op
at this time, because all caches use DEFAULT_SEEKS (2).

log_buf_len_setup() is called on the start_kernel->parse_args() path.  It
must not enable interrupts.

From: Harald Welte <laforge@gnumonks.org>

[disclaimer:  This was posted on the linuxppc list before, BenH asked me=20
 to re-post it to lkml]

The prism54 (http://prism54.org) driver for my cardbus adapter works
with 2.4.x, but not 2.6.x on a Titanium G4 Powerbook IV.

On 2.6.x the error message was
PCI:0001:02:00.0 Resource 0 [00000000-00001fff] is unassigned

After investigating differences in the PCI code of 2.4.x and 2.6.x, i
noticed that 2.4.x/arc/ppc/kernel/pci.c:pcibios_update_resource()
contained a couple of lines that unset the IORESOURCE_UNSET bitflag.

In 2.6.x, this is handled by the generic PCI core in
drivers/pci/setup-res.c:pci_update_resource() code.  However, the code
is missing the 'res->flags &=3D ~IORESOURCE_UNSET' part.

The below fix re-adds that section from 2.4.x.=20

I'm not sure wether this belongs into the arch-independent PCI api.
Anyway, on PPC it seems to be needed for certain cardbus devices.

Any comments welcome.

qlogic's 16k maximum I/O size bites again.  Neil says:

 The problems we fixed were all to do with normal IO.  This one is resync
 IO.

 The problem here is that raid1 always does resync in RESYNC_BLOCK_SIZE
 (=64k) IOs and if the device doesn't cope - tough.

 The simple fix is to #define RESYNC_BLOCK_SIZE to PAGE_SIZE in md/raid1.c

 The better fix is to rewrite the raid1 resync code to use bio_add_page.

 This means we have to build the read request and the write requests at the
 same time, and then when a bio_add_page fails, we back-out the last page
 from the bios that have one too many, and then do the read followed by the
 writes.

 I have some code the nearly does this, but I haven't got it actually
 working yet and I am on leave until mid January.

 I would recommend doing

 fs/drivers/md/raid1.c:
 -#define RESYNC_BLOCK_SIZE (64*1024)
 +#define RESYNC_BLOCK_SIZE PAGE_SIZE

 for now.

From: Jon Burgess <mplayer@jburgess.uklinux.net>

The iso9660 filesystem code checks that the "sbsector" option is
positioned within the first 660Mb of the disk.

Today the iso9660 filesystem is used on DVD's which are much bigger than
660Mb and this check prevents the sbsector option being used to specify 
the location of the superblock of multisession DVD's.

With this check removed I can mount the second session on a DVD-R by 
specifying the sbsector, even though the  firmware on that drive returns
bogus data for the TOC.

If an invalid large sector number is entered then a "request beyond end 
of device" error is reported elsewhere in the block code, but appears to
do no damage.

From: Alan Cox <alan@redhat.com>

Change by Clear Zhang of ALI

From: Bernardo Innocenti <bernie@develer.com>

It needs init.h

From: Steven Cole <elenstev@mesatop.com>

From: "Seth, Rohit" <rohit.seth@intel.com>

We recently covered a bug in mm/mmap.c on IA-64.  While unmapping a address
space, unmap_region calls free_pgtables to possibly free the pages that are
used for page tables.  Currently no distinction is made between freeing a
region that is mapped by normal pages vs the pages that are mapped by
hugepages.  Architecture specific code needs to handle cases where PTEs
corresponding to a region that is mapped by hugepages is properly getting
unmapped.  Attached please find a patch that makes the required changes in
generic part of kernel.  We will need to send a separate IA-64 patch to use
this new semantics.  Currently, so not to disturb the PPC (as that is the
only arch that had ARCH_HAS_HUGEPAGE_ONLY_RANGE defined) we are mapping back
the definition of new function hugetlb_free_pgtables to free_pgtables.

From: Joe Korty <joe.korty@ccur.com>

We need to check whether preemption is needed after reenabling preemption
in kunmap_atomic().

From: Mark Haverkamp <markh@osdl.org>

This fixes a problem similar to the patch I submitted on 11/20

http://marc.theaimsgroup.com/?l=linux-kernel&m=106936439707962&w=2

In this case, though, the result is an:

"Incorrect number of segments after building list" message.

The macro __BVEC_START assumes a bi_idx of zero when the dm code can
submit a bio with a non-zero bi_idx.
The code has been tested on an 8 way / 8gb OSDL STP machine with a 197G
lvm volume running dbt2 test.

From: Juergen Quade <quade@hsnr.de>

I just hit a copy-paste typo in floppy.c.

From: Jim Radford <radford@indigita.com>

I finally took the time to figure our why my parallel port wasn't
working...  here's the patch.