Fix a couple of problems which were introduced by a recent race fix in the
ext2 block allocator:

- if the allocation attempt raced, and lost the race then a new attempt is
  made.  But the earlier reservation must be put back first.

  Add a call to group_release_blocks() to fix this.

- if the filesystem is genuinely corrupted then the code as-is can get
  stuck in an infinite loop, thinking that a blockgroup has free blocks and
  then discovering that its bitmap is full.

  Fix this by baling out after having scanned all blockgroups twice.

  (Thanks Muli Ben-Yehuda <mulix@mulix.org> for spotting this).

From: Alex Tomas <alex@clusterfs.com>

If the ext3 inode allocator tries to claim an inode and fails because
another CPU got in there first it will then advance onto the next
blockgroup and try again.

Change it to advance onto the next inode within the same blockgroup
instead.

From: Jens Axboe <axboe@suse.de>

Print a runtime warning if ide-scsi is used on a cd device.

Modify the ide-scsi menuconfig help to reflect that ide-scsi should
not be used for cd burning.

If both ext2 and ext3 are built as modules there is nothing to pull
percpu_counter_mod() into the kernel build and the ext2 and ext3 modules do
not load.

So move percpu_counter_mod() out of lib.a.

It now has no callers.

From: Mingming Cao <cmm@us.ibm.com>

I found several bugs/issues in the ext2_new_inode() code:

1) The for loop variable "i" is used to save the inode offset.  In the
   case of failure, the loop variable could be crapped.  So it is possible
   to quit searching before looking at every block groups.

2) The number of free inodes in the selected group is possibly being
   miscalculated.  The counter is only decreased in the find_group_xx()
   functions for the initial selected group.  If the initial try failed,
   and succeed in finding a free inode in other group, the counter for that
   group will not to be decreased.

3) In case of the concurrent case, going back to find_group_xx()
   functions are unnecessary, it will only get the same group as before.

The following patch fixed those issues.  Ideas are stolen from
ext3_new_inode().

From: Zwane Mwaikambo <zwane@arm.linux.org.uk>

If the CPU doesn't support PSE we cannot use hugetlb pages.

From: Oleg Drokin <green@linuxhacker.ru>

reiserfs shouldn't be holding a ref against a buffer when running
set_blocksize(): it means that truncate_inode_pages() cannot free that page.

Which is not fatal - the page will drift aimlessly down the LRU until the VM
nails it.   But it's better this way.

From: Thomas Schlicter

sched_clock() will try to use the TSC even if the system is not using the TSC
as a time source.  It causes bad scheduling decisions and poor interactivity.

The problem was exhibited by the patch which uses ACPI PM as a time source,
but could also happen if the system is using the PIT.

From: Stephen Hemminger <shemminger@osdl.org>

The original problem all this is solving is that when NTP is slowing the clock
there existed real cases where time appeared to go backwards. Assuming NTP was
slowing the clock, then it would update the xtime by 999us at the next timer interrupt.
If a program read time three times:

A:	    xtime = t0
B: A+1000   xtime = t0 + 1000
C: B+1	    xtime = t0 + 999

To behave correctly C > B > A; but we were returning C < B

The code does have bug if we are losing clock interrupts.  The test for
lost interrupts needs to be after the interval clamp.

There's a window in this function where a wakeup can get lost.

From: Zwane Mwaikambo <zwane@arm.linux.org.uk>

gcc-3.2.2-5 miscompiles constant_test_bit().  Tweak it so the compiler gets
it right.  It cleans it up too!

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

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

We need to make the scan data unsigned, since we do

 	length = ((data[0] << 24) | (data[1] << 16) |
 		  (data[2] << 8) | (data[3] << 0));

and if data[3] is 0xff, this expression will always evaluate to
0xffffffff.  etcetera.

into hera.kernel.org:/home/davem/BK/net-2.5

Problem introduced by cset 1.1046.1.318

This is the PPC64 counterpart of the fix for the potential race in the
syscall restart code that has gone into other architectures.  It resets
current_thread_info()->restart_block.fn to do_no_syscall_restart in
the sigreturn code.

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

When binding to two different multicast addresses on the same UDP
port, a copy sent to either multicast address is delivered to both.

into nuts.ninka.net:/disk1/davem/BK/net-2.5

While here, fix the existing conditional.  The || should be an && as
all config options mentioned should prevent VGA_CONSOLE from being
offered.

Russell King reports:
 "With previous kernels, the nodes are added to the list in reverse order,
  so architecture code knew we had to add the highest PFN first and the
  lowest PFN node last.

  Unfortunately, init_bootmem_core() now sorts the nodes according to
  their start pfn. This active sorting broke ARM discontig memory support."

Andrew Morton chimes in:
 "It looks to be bogus on ia64 as well, for which the patch was written"

Yep, I think it is bogus.  There's only one caller on ia64 that would be
affected--swiotlb_init(), and afaik multi-node systems won't be using
that code (except maybe NEC?), so even if the pgdat list is out of order
we should be ok.  If not I'll fix the ia64 discontig code.

kernel_thread() returns the pid if successful, so the test for
errors is to test for _negative_ values.

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

It is using local variable `i' in both the inner and outer loop.

Need to bring the for loop outside the loop.  Otherwise we need to reset the
setup_frame to tp->setup_frame after every loop.  You do not need to set the
setup_frm for every mc address, we can set once after the complete has_table
is ready.

Always disable system call restart when returning from a signal
handler.  This follows the new x86 behaviour.

We're actually much better off resetting system call restart at signal
return.

This makes all other resets unnecessary.

Here's the ppc version of it.

invoking the signal. This fixes all races.

As per discussion with Paul Mackerras on linux-kernel.

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

This patch ensures that the PPC kernel cancels any pending restarted
system call when it delivers a signal.  This is the PPC counterpart of
the change that has recently gone into i386 and other architectures.

This patch fixes a bug on PPC where the kernel will oops if a process
does a system call and the system call number is out of range.

While fixing that, I noticed that if the process is being ptraced, an
out-of-range system call will not get traced on the way in but will on
the way out.  This patch fixes that too, by making it get traced on
the way in as well as the way out.  It turned out to be less change,
and fewer instructions overall, to do that than to make the
out-of-range system call not be traced at all.

into nuts.ninka.net:/disk1/davem/BK/net-2.5