linux-toradex.git/arch, branch v2.6.27.52

x86: don't send SIGBUS for kernel page faults

2010-08-20T18:25:11+00:00

Based on commit 96054569190bdec375fe824e48ca1f4e3b53dd36 upstream,
authored by Linus Torvalds.

This is my backport to the .27 kernel tree, hopefully preserving
the same functionality.

Original commit message:
	It's wrong for several reasons, but the most direct one is that the
	fault may be for the stack accesses to set up a previous SIGBUS.  When
	we have a kernel exception, the kernel exception handler does all the
	fixups, not some user-level signal handler.

	Even apart from the nested SIGBUS issue, it's also wrong to give out
	kernel fault addresses in the signal handler info block, or to send a
	SIGBUS when a system call already returns EFAULT.

Cc: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

xen: drop xen_sched_clock in favour of using plain wallclock time

2010-08-13T20:50:38+00:00

commit 8a22b9996b001c88f2bfb54c6de6a05fc39e177a upstream.

xen_sched_clock only counts unstolen time.  In principle this should
be useful to the Linux scheduler so that it knows how much time a process
actually consumed.  But in practice this doesn't work very well as the
scheduler expects the sched_clock time to be synchronized between
cpus.  It also uses sched_clock to measure the time a task spends
sleeping, in which case "unstolen time" isn't meaningful.

So just use plain xen_clocksource_read to return wallclock nanoseconds
for sched_clock.

Signed-off-by: Jeremy Fitzhardinge 
Signed-off-by: Greg Kroah-Hartman

.gitignore updates

2010-08-06T17:53:05+00:00

commit c17dad6905fc82d8f523399e5c3f014e81d61df6 upstream.

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

x86, Calgary: Limit the max PHB number to 256

2010-08-02T17:18:51+00:00

commit d596043d71ff0d7b3d0bead19b1d68c55f003093 upstream.

The x3950 family can have as many as 256 PCI buses in a single system, so
change the limits to the maximum.  Since there can only be 256 PCI buses in one
domain, we no longer need the BUG_ON check.

Signed-off-by: Darrick J. Wong 
LKML-Reference: <20100701004519.GQ15515@tux1.beaverton.ibm.com>
Signed-off-by: H. Peter Anvin 
Signed-off-by: Greg Kroah-Hartman

x86, Calgary: Increase max PHB number

2010-08-02T17:18:50+00:00

commit 499a00e92dd9a75395081f595e681629eb1eebad upstream.

Newer systems (x3950M2) can have 48 PHBs per chassis and 8
chassis, so bump the limits up and provide an explanation
of the requirements for each class.

Signed-off-by: Darrick J. Wong 
Acked-by: Muli Ben-Yehuda 
Cc: Corinna Schultz 
LKML-Reference: <20100624212647.GI15515@tux1.beaverton.ibm.com>
[ v2: Fixed build bug, added back PHBS_PER_CALGARY == 4 ]
Signed-off-by: Ingo Molnar 
Signed-off-by: Greg Kroah-Hartman

parisc: clear floating point exception flag on SIGFPE signal

2010-07-05T18:08:47+00:00

commit 550f0d922286556c7ea43974bb7921effb5a5278 upstream.

Clear the floating point exception flag before returning to
user space. This is needed, else the libc trampoline handler
may hit the same SIGFPE again while building up a trampoline
to a signal handler.

Fixes debian bug #559406.

Signed-off-by: Helge Deller 
Signed-off-by: Kyle McMartin 
Signed-off-by: Greg Kroah-Hartman

powerpc/oprofile: fix potential buffer overrun in op_model_cell.c

2010-07-05T18:08:43+00:00

commit 238c1a78c957f3dc7cb848b161dcf4805793ed56 upstream.

Fix potential initial_lfsr buffer overrun.
Writing past the end of the buffer could happen when index == ENTRIES

Signed-off-by: Denis Kirjanov 
Signed-off-by: Robert Richter 
Signed-off-by: Greg Kroah-Hartman

powerpc/pseries: Make query_cpu_stopped callable outside hotplug cpu

2010-07-05T18:08:42+00:00

commit f8b67691828321f5c85bb853283aa101ae673130 upstream.

This moves query_cpu_stopped() out of the hotplug cpu code and into
smp.c so it can called in other places and renames it to
smp_query_cpu_stopped().

It also cleans up the return values by adding some #defines

Signed-off-by: Michael Neuling 
Signed-off-by: Benjamin Herrenschmidt 
Signed-off-by: Greg Kroah-Hartman

powerpc/pseries: Only call start-cpu when a CPU is stopped

2010-07-05T18:08:42+00:00

commit aef40e87d866355ffd279ab21021de733242d0d5 upstream.

Currently we always call start-cpu irrespective of if the CPU is
stopped or not. Unfortunatley on POWER7, firmware seems to not like
start-cpu being called when a cpu already been started.  This was not
the case on POWER6 and earlier.

This patch checks to see if the CPU is stopped or not via an
query-cpu-stopped-state call, and only calls start-cpu on CPUs which
are stopped.

This fixes a bug with kexec on POWER7 on PHYP where only the primary
thread would make it to the second kernel.

Reported-by: Ankita Garg 
Signed-off-by: Michael Neuling 
Signed-off-by: Benjamin Herrenschmidt 
Signed-off-by: Greg Kroah-Hartman

powerpc: Fix handling of strncmp with zero len

2010-07-05T18:08:42+00:00

commit 637a99022fb119b90fb281715d13172f0394fc12 upstream.

Commit 0119536c, which added the assembly version of strncmp to
powerpc, mentions that it adds two instructions to the version from
boot/string.S to allow it to handle len=0. Unfortunately, it doesn't
always return 0 when that is the case. The length is passed in r5, but
the return value is passed back in r3. In certain cases, this will
happen to work. Otherwise it will pass back the address of the first
string as the return value.

This patch lifts the len <= 0 handling code from memcpy to handle that
case.

Reported by: Christian_Sellars@symantec.com
Signed-off-by: Jeff Mahoney 
Signed-off-by: Benjamin Herrenschmidt 
Signed-off-by: Greg Kroah-Hartman