linux-toradex.git/arch, branch v2.6.17.12

Silent data corruption caused by XPC

2006-09-08T21:51:39+00:00

Jack Steiner identified a problem where XPC can cause a silent
data corruption.  On module load, the placement may cause the
xpc_remote_copy_buffer to span two physical pages.  DMA transfers are
done to the start virtual address translated to physical.

This patch changes the buffer from a statically allocated buffer to a
kmalloc'd buffer.  Dean Nelson reviewed this before posting.  I have
tested it in the configuration that was showing the memory corruption
and verified it works.  I also added a BUG_ON statement to help catch
this if a similar situation is encountered.

Signed-off-by: Robin Holt 
Signed-off-by: Dean Nelson 
Signed-off-by: Jack Steiner 
Signed-off-by: Tony Luck 
Signed-off-by: Greg Kroah-Hartman

SPARC64: Fix X server crashes on sparc64

2006-09-08T21:51:38+00:00

[SPARC64]: Fix X server hangs due to large pages.

This problem was introduced by changeset
14778d9072e53d2171f66ffd9657daff41acfaed

Unlike the hugetlb code paths, the normal fault code is not setup to
propagate PTE changes for large page sizes correctly like the ones we
make for I/O mappings in io_remap_pfn_range().

It is absolutely necessary to update all sub-ptes of a largepage
mapping on a fault.  Adding special handling for this would add
considerably complexity to tlb_batch_add().  So let's just side-step
the issue and forcefully dirty any writable PTEs created by
io_remap_pfn_range().

The only other real option would be to disable to large PTE code of
io_remap_pfn_range() and we really don't want to do that.

Much thanks to Mikael Pettersson for tracking down this problem and
testing debug patches.

Signed-off-by: David S. Miller

IA64: local DoS with corrupted ELFs

2006-08-23T21:13:32+00:00

This patch prevents cross-region mappings
on IA64 and SPARC which could lead to system crash.

davem@ confirmed: "This looks fine to me." :)

Signed-Off-By: Pavel Emelianov 
Signed-Off-By: Kirill Korotaev 
Signed-off-by: Greg Kroah-Hartman

[PATCH] powerpc: Clear HID0 attention enable on PPC970 at boot time (CVE-2006-4093)

2006-08-18T16:25:51+00:00

Clear HID0[en_attn] at CPU init time on PPC970.  Closes CVE-2006-4093.

Signed-off-by: Olof Johansson 
Signed-off-by: Paul Mackerras 
Signed-off-by: Greg Kroah-Hartman

PCI: fix issues with extended conf space when MMCONFIG disabled because of e820

2006-08-07T03:52:12+00:00

On 15 Jun 2006 03:45:10 +0200, Andi Kleen wrote:
> Anyways I would say that if the BIOS can't get MCFG right then
> it's likely not been validated on that board and shouldn't be used.

According to Petr Vandrovec:

 ... "What is important (and checked) is address of MMCONFIG reported by MCFG
 table...  Unfortunately code does not bother with printing that address :-(

 "Another problem is that code has hardcoded that MMCONFIG area is 256MB large.
 Unfortunately for the code PCI specification allows any power of two between 2MB
 and 256MB if vendor knows that such amount of busses (from 2 to 128) will be
 sufficient for system.  With notebook it is quite possible that not full 8 bits
 are implemented for MMCONFIG bus number."

So here is a patch.  Unfortunately my system still fails the test because
it doesn't reserve any part of the MMCONFIG area, but this may fix others.

Booted on x86_64, only compiled on i386.  x86_64 still remaps the max area
(256MB) even though only 2MB is checked... but 2.6.16 had no check at all
so it is still better.

PCI: reduce size of x86 MMCONFIG reserved area check

1.  Print the address of the MMCONFIG area when the test for that area
    being reserved fails.

2.  Only check if the first 2MB is reserved, as that is the minimum.

Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>
Acked-by: Arjan van de Ven 
Signed-off-by: Greg Kroah-Hartman 
Signed-off-by: Chris Wright

Fix powernow-k8 SMP kernel on UP hardware bug.

2006-07-25T03:35:23+00:00

[CPUFREQ] Fix powernow-k8 SMP kernel on UP hardware bug.

Fix powernow-k8 doesn't load bug.
Reference: https://launchpad.net/distros/ubuntu/+source/linux-source-2.6.15/+bug/35145

Signed-off-by: Ben Collins 
Signed-off-by: Dave Jones 
Signed-off-by: Greg Kroah-Hartman

Make powernow-k7 work on SMP kernels.

2006-07-25T03:35:23+00:00

[CPUFREQ] Make powernow-k7 work on SMP kernels.
Even though powernow-k7 doesn't work in SMP environments,
it can work on an SMP configured kernel if there's only
one CPU present, however recalibrate_cpu_khz was returning
-EINVAL on such kernels, so we failed to init the cpufreq driver.

Signed-off-by: Dave Jones 
Signed-off-by: Greg Kroah-Hartman

memory hotplug: solve config broken: undefined reference to `online_page'

2006-07-25T03:35:20+00:00

Memory hotplug code of i386 adds memory to only highmem.  So, if
CONFIG_HIGHMEM is not set, CONFIG_MEMORY_HOTPLUG shouldn't be set.
Otherwise, it causes compile error.

In addition, many architecture can't use memory hotplug feature yet.  So, I
introduce CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG.

Signed-off-by: Yasunori Goto 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Chris Wright 
Signed-off-by: Greg Kroah-Hartman

x86_64: Fix modular pc speaker

2006-07-25T03:35:19+00:00

It turned out that the following change is needed when the speaker is
compiled as a module.

Signed-off-by: Andi Kleen 
Signed-off-by: Linus Torvalds 
Signed-off-by: Chris Wright 
Signed-off-by: Greg Kroah-Hartman

[PATCH] UML: fix uptime

2006-06-30T00:17:16+00:00

The use of signed instead of unsigned here broke the calculations on
negative numbers that are involved in calculating wall_to_monotonic.

Signed-off-by: Jeff Dike 
Signed-off-by: Chris Wright