linux-toradex.git/lib, branch v2.6.38.8

rcu: Fix unpaired rcu_irq_enter() from locking selftests

2011-06-03T01:34:12+00:00

commit ba9f207c9f82115aba4ce04b22e0081af0ae300f upstream.

HARDIRQ_ENTER() maps to irq_enter() which calls rcu_irq_enter().
But HARDIRQ_EXIT() maps to __irq_exit() which doesn't call
rcu_irq_exit().

So for every locking selftest that simulates hardirq disabled,
we create an imbalance in the rcu extended quiescent state
internal state.

As a result, after the first missing rcu_irq_exit(), subsequent
irqs won't exit dyntick-idle mode after leaving the interrupt
handler.  This means that RCU won't see the affected CPU as being
in an extended quiescent state, resulting in long grace-period
delays (as in grace periods extending for hours).

To fix this, just use __irq_enter() to simulate the hardirq
context. This is sufficient for the locking selftests as we
don't need to exit any extended quiescent state or perform
any check that irqs normally do when they wake up from idle.

As a side effect, this patch makes it possible to restore
"rcu: Decrease memory-barrier usage based on semi-formal proof",
which eventually helped finding this bug.

Reported-and-tested-by: Yinghai Lu 
Signed-off-by: Frederic Weisbecker 
Cc: Paul E. McKenney 
Cc: Ingo Molnar 
Cc: Peter Zijlstra 
Signed-off-by: Paul E. McKenney 
Signed-off-by: Greg Kroah-Hartman

XZ decompressor: Fix decoding of empty LZMA2 streams

2011-05-09T22:06:48+00:00

commit 646032e3b05b32d3f20cb108a030593d9d792eb5 upstream.

The old code considered valid empty LZMA2 streams to be corrupt.
Note that a typical empty .xz file has no LZMA2 data at all,
and thus most .xz files having no uncompressed data are handled
correctly even without this fix.

Signed-off-by: Lasse Collin 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

flex_arrays: allow zero length flex arrays

2011-05-09T22:06:44+00:00

commit bf69d41d198138e3c601e9a6645f4f1369aff7e0 upstream.

Just like kmalloc will allow one to allocate a 0 length segment of memory
flex arrays should do the same thing.  It should bomb if you try to use
something, but it should at least allow the allocation.

This is needed because when SELinux switched to using flex_arrays in 2.6.38
the inability to allocate a 0 length array resulted in SELinux policy load
returning -ENOSPC when previously it worked.

Based-on-patch-by: Steffen Klassert 
Signed-off-by: Eric Paris 
Tested-by: Chris Richards 
Signed-off-by: Greg Kroah-Hartman

flex_array: flex_array_prealloc takes a number of elements, not an end

2011-05-09T22:06:43+00:00

commit 5d30b10bd68df007e7ae21e77d1e0ce184b53040 upstream.

Change flex_array_prealloc to take the number of elements for which space
should be allocated instead of the last (inclusive) element. Users
and documentation are updated accordingly.  flex_arrays got introduced before
they had users.  When folks started using it, they ended up needing a
different API than was coded up originally.  This swaps over to the API that
folks apparently need.

Based-on-patch-by: Steffen Klassert 
Signed-off-by: Eric Paris 
Tested-by: Chris Richards 
Acked-by: Dave Hansen 
Signed-off-by: Greg Kroah-Hartman

kstrto*: converting strings to integers done (hopefully) right

2011-04-21T21:32:41+00:00

commit 33ee3b2e2eb9b4b6c64dcf9ed66e2ac3124e748c upstream.

1. simple_strto*() do not contain overflow checks and crufty,
   libc way to indicate failure.
2. strict_strto*() also do not have overflow checks but the name and
   comments pretend they do.
3. Both families have only "long long" and "long" variants,
   but users want strtou8()
4. Both "simple" and "strict" prefixes are wrong:
   Simple doesn't exactly say what's so simple, strict should not exist
   because conversion should be strict by default.

The solution is to use "k" prefix and add convertors for more types.
Enter
	kstrtoull()
	kstrtoll()
	kstrtoul()
	kstrtol()
	kstrtouint()
	kstrtoint()

	kstrtou64()
	kstrtos64()
	kstrtou32()
	kstrtos32()
	kstrtou16()
	kstrtos16()
	kstrtou8()
	kstrtos8()

Include runtime testsuite (somewhat incomplete) as well.

strict_strto*() become deprecated, stubbed to kstrto*() and
eventually will be removed altogether.

Use kstrto*() in code today!

Note: on some archs _kstrtoul() and _kstrtol() are left in tree, even if
      they'll be unused at runtime. This is temporarily solution,
      because I don't want to hardcode list of archs where these
      functions aren't needed. Current solution with sizeof() and
      __alignof__ at least always works.

Signed-off-by: Alexey Dobriyan 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6

2011-03-03T23:43:15+00:00

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (42 commits)
  MAINTAINERS: Add Andy Gospodarek as co-maintainer.
  r8169: disable ASPM
  RxRPC: Fix v1 keys
  AF_RXRPC: Handle receiving ACKALL packets
  cnic: Fix lost interrupt on bnx2x
  cnic: Prevent status block race conditions with hardware
  net: dcbnl: check correct ops in dcbnl_ieee_set()
  e1000e: disable broken PHY wakeup for ICH10 LOMs, use MAC wakeup instead
  igb: fix sparse warning
  e1000: fix sparse warning
  netfilter: nf_log: avoid oops in (un)bind with invalid nfproto values
  dccp: fix oops on Reset after close
  ipvs: fix dst_lock locking on dest update
  davinci_emac: Add Carrier Link OK check in Davinci RX Handler
  bnx2x: update driver version to 1.62.00-6
  bnx2x: properly calculate lro_mss
  bnx2x: perform statistics "action" before state transition.
  bnx2x: properly configure coefficients for MinBW algorithm (NPAR mode).
  bnx2x: Fix ethtool -t link test for MF (non-pmf) devices.
  bnx2x: Fix nvram test for single port devices.
  ...

net: fix nla_policy_len to actually _iterate_ over the policy

2011-02-28T20:38:25+00:00

Currently nla_policy_len always returns n * NLA_HDRLEN:
It loops, but does not advance it's iterator.
NLA_UNSPEC == 0 does not contain a .len in any policy.

Trivially fixed by adding p++.

Signed-off-by: Lars Ellenberg 
Signed-off-by: David S. Miller

swiotlb: fix wrong panic

2011-02-25T23:07:36+00:00

swiotlb's map_page wrongly calls panic() when it can't find a buffer fit
for device's dma mask.  It should return an error instead.

Devices with an odd dma mask (i.e.  under 4G) like b44 network card hit
this bug (the system crashes):

   http://marc.info/?l=linux-kernel&m=129648943830106&w=2

If swiotlb returns an error, b44 driver can use the own bouncing
mechanism.

Reported-by: Chuck Ebbert 
Signed-off-by: FUJITA Tomonori 
Tested-by: Arkadiusz Miskiewicz 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Expand CONFIG_DEBUG_LIST to several other list operations

2011-02-18T19:32:28+00:00

When list debugging is enabled, we aim to readably show list corruption
errors, and the basic list_add/list_del operations end up having extra
debugging code in them to do some basic validation of the list entries.

However, "list_del_init()" and "list_move[_tail]()" ended up avoiding
the debug code due to how they were written. This fixes that.

So the _next_ time we have list_move() problems with stale list entries,
we'll hopefully have an easier time finding them..

Signed-off-by: Linus Torvalds

m68knommu: Remove dependencies on nonexistent M68KNOMMU

2011-02-08T05:07:44+00:00

M68KNOMMU is set nowhere.

Signed-off-by: Geert Uytterhoeven 
Signed-off-by: Greg Ungerer