linux-toradex.git/arch, branch v3.9.2 Linux kernel for Apalis and Colibri modules arm64: Ignore the 'write' ESR flag on cache maintenance faults 2013-05-11T14:18:24+00:00 Catalin Marinas catalin.marinas@arm.com 2013-05-07T15:57:06+00:00 0661e5659a502db6c989318628365fc34242481d commit 0e7f7bcc3fc87489cda5aa6aff8ce40eed912279 upstream. ESR.WnR bit is always set on data cache maintenance faults even though the page is not required to have write permission. If a translation fault (page not yet mapped) happens for read-only user address range, Linux incorrectly assumes a permission fault. This patch adds the check of the ESR.CM bit during the page fault handling to ignore the 'write' flag. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Reported-by: Tim Northover <Tim.Northover@arm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 0e7f7bcc3fc87489cda5aa6aff8ce40eed912279 upstream.

ESR.WnR bit is always set on data cache maintenance faults even though
the page is not required to have write permission. If a translation
fault (page not yet mapped) happens for read-only user address range,
Linux incorrectly assumes a permission fault. This patch adds the check
of the ESR.CM bit during the page fault handling to ignore the 'write'
flag.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reported-by: Tim Northover <Tim.Northover@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
perf/x86/intel/lbr: Demand proper privileges for PERF_SAMPLE_BRANCH_KERNEL 2013-05-11T14:18:22+00:00 Peter Zijlstra a.p.zijlstra@chello.nl 2013-05-03T12:11:25+00:00 5e23729b22a8ec773f4545bf4a0d0abc3c90d4ba commit 7cc23cd6c0c7d7f4bee057607e7ce01568925717 upstream. We should always have proper privileges when requesting kernel data. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Andi Kleen <ak@linux.intel.com> Cc: eranian@google.com Link: http://lkml.kernel.org/r/20130503121256.230745028@chello.nl [ Fix build error reported by fengguang.wu@intel.com, propagate error code back. ] Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: http://lkml.kernel.org/n/tip-v0x9ky3ahzr6nm3c6ilwrili@git.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 7cc23cd6c0c7d7f4bee057607e7ce01568925717 upstream.

We should always have proper privileges when requesting kernel
data.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: eranian@google.com
Link: http://lkml.kernel.org/r/20130503121256.230745028@chello.nl
[ Fix build error reported by fengguang.wu@intel.com, propagate error code back. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: http://lkml.kernel.org/n/tip-v0x9ky3ahzr6nm3c6ilwrili@git.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
perf/x86/intel/lbr: Fix LBR filter 2013-05-11T14:18:21+00:00 Peter Zijlstra a.p.zijlstra@chello.nl 2013-05-03T12:11:24+00:00 d851a41c72181e5170a3a81fa124c678bd449a1c commit 6e15eb3ba6c0249c9e8c783517d131b47db995ca upstream. The LBR 'from' adddress is under full userspace control; ensure we validate it before reading from it. Note: is_module_text_address() can potentially be quite expensive; for those running into that with high overhead in modules optimize it using an RCU backed rb-tree. Reported-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: eranian@google.com Link: http://lkml.kernel.org/r/20130503121256.158211806@chello.nl Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: http://lkml.kernel.org/n/tip-mk8i82ffzax01cnqo829iy1q@git.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 6e15eb3ba6c0249c9e8c783517d131b47db995ca upstream.

The LBR 'from' adddress is under full userspace control; ensure
we validate it before reading from it.

Note: is_module_text_address() can potentially be quite
expensive; for those running into that with high overhead
in modules optimize it using an RCU backed rb-tree.

Reported-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: eranian@google.com
Link: http://lkml.kernel.org/r/20130503121256.158211806@chello.nl
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: http://lkml.kernel.org/n/tip-mk8i82ffzax01cnqo829iy1q@git.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
perf/x86: Blacklist all MEM_*_RETIRED events for Ivy Bridge 2013-05-11T14:18:21+00:00 Peter Zijlstra a.p.zijlstra@chello.nl 2013-05-03T12:11:23+00:00 1a2d6c494667deb43c5dfca27b719a1446a1d641 commit 741a698f420c34c458294a6accecfbad702a7c52 upstream. Errata BV98 states that all MEM_*_RETIRED events corrupt the counter value of the SMT sibling's counters. Blacklist these events Reported-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: eranian@google.com Link: http://lkml.kernel.org/r/20130503121256.083340271@chello.nl Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: http://lkml.kernel.org/n/tip-jwra43mujrv1oq9xk6mfe57v@git.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 741a698f420c34c458294a6accecfbad702a7c52 upstream.

Errata BV98 states that all MEM_*_RETIRED events corrupt the
counter value of the SMT sibling's counters. Blacklist these
events

Reported-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: eranian@google.com
Link: http://lkml.kernel.org/r/20130503121256.083340271@chello.nl
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: http://lkml.kernel.org/n/tip-jwra43mujrv1oq9xk6mfe57v@git.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
perf/x86/intel: Fix unintended variable name reuse 2013-05-11T14:18:21+00:00 Jan-Simon Möller dl9pf@gmx.de 2013-04-30T10:02:33+00:00 358247fd37fbb17ac043548f0921d45d4f0009e2 commit 1b0dac2ac6debdbf1541e15f2cede03613cf4465 upstream. The variable name events_group is already in used and led to a compilation error when using clang to build the Linux Kernel . The fix is just to rename the var. No functional change. Please apply. Fix suggested in discussion by PaX Team <pageexec@freemail.hu> Signed-off-by: Jan-Simon Möller <dl9pf@gmx.de> Cc: rostedt@goodmis.org Cc: a.p.zijlstra@chello.nl Cc: paulus@samba.org Cc: acme@ghostprotocols.net Link: http://lkml.kernel.org/r/1367316153-14808-1-git-send-email-dl9pf@gmx.de Signed-off-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 1b0dac2ac6debdbf1541e15f2cede03613cf4465 upstream.

The variable name events_group is already in used and led to a
compilation error when using clang to build the Linux Kernel .
The fix is just to rename the var. No functional change. Please
apply.

Fix suggested in discussion by PaX Team <pageexec@freemail.hu>

Signed-off-by: Jan-Simon Möller <dl9pf@gmx.de>
Cc: rostedt@goodmis.org
Cc: a.p.zijlstra@chello.nl
Cc: paulus@samba.org
Cc: acme@ghostprotocols.net
Link: http://lkml.kernel.org/r/1367316153-14808-1-git-send-email-dl9pf@gmx.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
perf/x86/intel: Add support for IvyBridge model 58 Uncore 2013-05-11T14:18:20+00:00 Vince Weaver vincent.weaver@maine.edu 2013-04-29T19:52:27+00:00 4d9a5a21e6c7b3dbcb2d20554f815037dbbe17e9 commit 9a6bc14350b130427725f33e371e86212fa56c85 upstream. According to Intel Vol3b 18.9, the IvyBridge model 58 uncore is the same as that of SandyBridge. I've done some simple tests and with this patch things seem to work on my mac-mini. Signed-off-by: Vince Weaver <vincent.weaver@maine.edu> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net> Cc: Stephane Eranian <eranian@gmail.com> Link: http://lkml.kernel.org/r/alpine.DEB.2.02.1304291549320.15827@vincent-weaver-1.um.maine.edu Signed-off-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 9a6bc14350b130427725f33e371e86212fa56c85 upstream.

According to Intel Vol3b 18.9, the IvyBridge model 58 uncore is
the same as that of SandyBridge.

I've done some simple tests and with this patch things seem to
work on my mac-mini.

Signed-off-by: Vince Weaver <vincent.weaver@maine.edu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Stephane Eranian <eranian@gmail.com>
Link: http://lkml.kernel.org/r/alpine.DEB.2.02.1304291549320.15827@vincent-weaver-1.um.maine.edu
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
powerpc: fix numa distance for form0 device tree 2013-05-11T14:18:17+00:00 Vaidyanathan Srinivasan svaidy@linux.vnet.ibm.com 2013-03-22T05:49:35+00:00 f63a3b86960177bca59f29eb5c71e3c2fb3e91aa commit 7122beeee7bc1757682049780179d7c216dd1c83 upstream. The following commit breaks numa distance setup for old powerpc systems that use form0 encoding in device tree. commit 41eab6f88f24124df89e38067b3766b7bef06ddb powerpc/numa: Use form 1 affinity to setup node distance Device tree node /rtas/ibm,associativity-reference-points would index into /cpus/PowerPCxxxx/ibm,associativity based on form0 or form1 encoding detected by ibm,architecture-vec-5 property. All modern systems use form1 and current kernel code is correct. However, on older systems with form0 encoding, the numa distance will get hard coded as LOCAL_DISTANCE for all nodes. This causes task scheduling anomaly since scheduler will skip building numa level domain (topmost domain with all cpus) if all numa distances are same. (value of 'level' in sched_init_numa() will remain 0) Prior to the above commit: ((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE) Restoring compatible behavior with this patch for old powerpc systems with device tree where numa distance are encoded as form0. Signed-off-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 7122beeee7bc1757682049780179d7c216dd1c83 upstream.

The following commit breaks numa distance setup for old powerpc
systems that use form0 encoding in device tree.

commit 41eab6f88f24124df89e38067b3766b7bef06ddb
powerpc/numa: Use form 1 affinity to setup node distance

Device tree node /rtas/ibm,associativity-reference-points would
index into /cpus/PowerPCxxxx/ibm,associativity based on form0 or
form1 encoding detected by ibm,architecture-vec-5 property.

All modern systems use form1 and current kernel code is correct.
However, on older systems with form0 encoding, the numa distance
will get hard coded as LOCAL_DISTANCE for all nodes.  This causes
task scheduling anomaly since scheduler will skip building numa
level domain (topmost domain with all cpus) if all numa distances
are same.  (value of 'level' in sched_init_numa() will remain 0)

Prior to the above commit:
((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE)

Restoring compatible behavior with this patch for old powerpc systems
with device tree where numa distance are encoded as form0.

Signed-off-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
powerpc/tm: Fix null pointer deference in flush_hash_page 2013-05-11T14:18:16+00:00 Michael Neuling mikey@neuling.org 2013-05-02T15:36:14+00:00 4a32fbd0b67057a94dbd173ed85114aa46e32dfb commit c2fd22df89365df9451d5b91da3b7bfd48122ecd upstream. Make sure that current->thread.reg exists before we deference it in flush_hash_page. Signed-off-by: Michael Neuling <mikey@neuling.org> Reported-by: John J Miller <millerjo@us.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit c2fd22df89365df9451d5b91da3b7bfd48122ecd upstream.

Make sure that current->thread.reg exists before we deference it in
flush_hash_page.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Reported-by: John J Miller <millerjo@us.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
powerpc: Emulate non privileged DSCR read and write 2013-05-11T14:18:16+00:00 Anton Blanchard anton@samba.org 2013-05-01T20:06:33+00:00 5e701b123c0d3c58c01d3168de9ef11d86eea34d commit 73d2fb758e678c93bc76d40876c2359f0729b0ef upstream. POWER8 allows read and write of the DSCR in userspace. We added kernel emulation so applications could always use the instructions regardless of the CPU type. Unfortunately there are two SPRs for the DSCR and we only added emulation for the privileged one. Add code to match the non privileged one. A simple test was created to verify the fix: http://ozlabs.org/~anton/junkcode/user_dscr_test.c Without the patch we get a SIGILL and it passes with the patch. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 73d2fb758e678c93bc76d40876c2359f0729b0ef upstream.

POWER8 allows read and write of the DSCR in userspace. We added
kernel emulation so applications could always use the instructions
regardless of the CPU type.

Unfortunately there are two SPRs for the DSCR and we only added
emulation for the privileged one. Add code to match the non
privileged one.

A simple test was created to verify the fix:

http://ozlabs.org/~anton/junkcode/user_dscr_test.c

Without the patch we get a SIGILL and it passes with the patch.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
xen/arm: actually pass a non-NULL percpu pointer to request_percpu_irq 2013-05-11T14:18:16+00:00 Stefano Stabellini stefano.stabellini@eu.citrix.com 2013-04-25T13:53:09+00:00 b6356ec0a242fd362019bd1f08680fb8f413af4a commit 2798ba7d19aed645663398a21ec4006bfdbb1ef3 upstream. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: Ian Campbell <ian.camjpbell@citrix.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 2798ba7d19aed645663398a21ec4006bfdbb1ef3 upstream.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Reviewed-by: Ian Campbell <ian.camjpbell@citrix.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>