linux.git/arch/x86/Kconfig.debug, branch v3.10

Kconfig: consolidate CONFIG_DEBUG_STRICT_USER_COPY_CHECKS

2013-05-01T00:04:09+00:00

The help text for this config is duplicated across the x86, parisc, and
s390 Kconfig.debug files.  Arnd Bergman noted that the help text was
slightly misleading and should be fixed to state that enabling this
option isn't a problem when using pre 4.4 gcc.

To simplify the rewording, consolidate the text into lib/Kconfig.debug
and modify it there to be more explicit about when you should say N to
this config.

Also, make the text a bit more generic by stating that this option
enables compile time checks so we can cover architectures which emit
warnings vs.  ones which emit errors.  The details of how an
architecture decided to implement the checks isn't as important as the
concept of compile time checking of copy_from_user() calls.

While we're doing this, remove all the copy_from_user_overflow() code
that's duplicated many times and place it into lib/ so that any
architecture supporting this option can get the function for free.

Signed-off-by: Stephen Boyd 
Acked-by: Arnd Bergmann 
Acked-by: Ingo Molnar 
Acked-by: H. Peter Anvin 
Cc: Arjan van de Ven 
Acked-by: Helge Deller 
Cc: Heiko Carstens 
Cc: Stephen Rothwell 
Cc: Chris Metcalf 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

x86/mm: Re-enable DEBUG_TLBFLUSH for X86_32

2013-04-10T12:53:12+00:00

CONFIG_INVLPG got removed in commit
094ab1db7cb7833cd4c820acd868fc26acf3f08e ("x86, 386 removal:
Remove CONFIG_INVLPG").

That commit left one instance of CONFIG_INVLPG untouched, effectively
disabling DEBUG_TLBFLUSH for X86_32. Since all currently supported
x86 CPUs should now be able to support that option, just drop the entire
sub-dependency.

Signed-off-by: Paul Bolle 
Link: http://lkml.kernel.org/r/1363262077.1335.71.camel@x61.thuisdomein
Signed-off-by: Ingo Molnar

x86/tlb: add tlb_flushall_shift knob into debugfs

2012-06-28T02:29:10+00:00

kernel will replace cr3 rewrite with invlpg when
  tlb_flush_entries <= active_tlb_entries / 2^tlb_flushall_factor
if tlb_flushall_factor is -1, kernel won't do this replacement.

User can modify its value according to specific CPU/applications.

Thanks for Borislav providing the help message of
CONFIG_DEBUG_TLBFLUSH.

Signed-off-by: Alex Shi 
Link: http://lkml.kernel.org/r/1340845344-27557-6-git-send-email-alex.shi@intel.com
Signed-off-by: H. Peter Anvin

Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2012-01-12T03:13:40+00:00

* 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/intel config: Fix the APB_TIMER selection
  x86/mrst: Add additional debug prints for pb_keys
  x86/intel config: Revamp configuration to allow for Moorestown and Medfield
  x86/intel/scu/ipc: Match the changes in the x86 configuration
  x86/apb: Fix configuration constraints
  x86: Fix INTEL_MID silly
  x86/Kconfig: Cyclone-timer depends on x86-summit
  x86: Reduce clock calibration time during slave cpu startup
  x86/config: Revamp configuration for MID devices
  x86/sfi: Kill the IRQ as id hack

x86, NMI: NMI selftest depends on the local apic

2011-12-07T22:26:55+00:00

The selftest doesn't work with out a local apic for now.

Reported-by: Randy Durlap 
Signed-off-by: Don Zickus 
Cc: Stephen Rothwell 
Link: http://lkml.kernel.org/r/20111207210630.GI1669@redhat.com
Signed-off-by: Ingo Molnar

x86/config: Revamp configuration for MID devices

2011-12-05T13:02:46+00:00

This follows on from the patch applied in 3.2rc1 which creates
an INTEL_MID configuration. We can now add the entry for
Medfield specific code. After this is merged the final patch
will be submitted which moves the rest of the device Kconfig
dependancies to MRST/MEDFIELD/INTEL_MID as appropriate.

Signed-off-by: Alan Cox 
Signed-off-by: Ingo Molnar

x86, NMI: Add NMI IPI selftest

2011-12-05T11:00:16+00:00

The previous patch modified the stop cpus path to use NMI
instead of IRQ as the way to communicate to the other cpus to
shutdown.  There were some concerns that various machines may
have problems with using an NMI IPI.

This patch creates a selftest to check if NMI is working at
boot. The idea is to help catch any issues before the machine
panics and we learn the hard way.

Loosely based on the locking-selftest.c file, this separate file
runs a couple of simple tests and reports the results.  The
output looks like:

...
Brought up 4 CPUs
----------------
| NMI testsuite:
--------------------
  remote IPI:  ok  |
   local IPI:  ok  |
--------------------
Good, all   2 testcases passed! |
---------------------------------
Total of 4 processors activated (21330.61 BogoMIPS).
...

Signed-off-by: Don Zickus 
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Cc: Robert Richter 
Cc: seiji.aguchi@hds.com
Cc: vgoyal@redhat.com
Cc: mjg@redhat.com
Cc: tony.luck@intel.com
Cc: gong.chen@intel.com
Cc: satoru.moriya@hds.com
Cc: avi@redhat.com
Cc: Andi Kleen 
Link: http://lkml.kernel.org/r/1318533267-18880-3-git-send-email-dzickus@redhat.com
Signed-off-by: Ingo Molnar

x86: Check stack overflow in detail

2011-12-05T10:37:45+00:00

Currently, only kernel stack is checked for the overflow, which
is not sufficient for systems that need a high reliability. To
enhance it, it is required to check the IRQ and exception
stacks, as well.

This patch checks all the stack types and will cause messages of
stacks in detail when free stack space drops below a certain
limit except user stack.

Signed-off-by: Mitsuo Hayasaka 
Cc: yrl.pp-manager.tt@hitachi.com
Cc: Randy Dunlap 
Link: http://lkml.kernel.org/r/20111129060829.11076.51733.stgit@ltc219.sdl.hitachi.co.jp
Signed-off-by: Ingo Molnar 
Cc: "H. Peter Anvin"

doc: fix broken references

2011-09-27T16:08:04+00:00

There are numerous broken references to Documentation files (in other
Documentation files, in comments, etc.). These broken references are
caused by typo's in the references, and by renames or removals of the
Documentation files. Some broken references are simply odd.

Fix these broken references, sometimes by dropping the irrelevant text
they were part of.

Signed-off-by: Paul Bolle 
Signed-off-by: Jiri Kosina

lib: consolidate DEBUG_STACK_USAGE option

2011-05-25T15:39:54+00:00

Most arches define CONFIG_DEBUG_STACK_USAGE exactly the same way.  Move it
to lib/Kconfig.debug so each arch doesn't have to define it.  This
obviously makes the option generic, but that's fine because the config is
already used in generic code.

It's not obvious to me that sysrq-P actually does anything caution by
keeping the most inclusive wording.

Signed-off-by: Stephen Boyd 
Cc: Chris Metcalf 
Acked-by: David S. Miller 
Acked-by: Richard Weinberger 
Acked-by: Mike Frysinger 
Cc: Russell King 
Cc: Hirokazu Takata 
Acked-by: Ralf Baechle 
Cc: Paul Mackerras 
Acked-by: Benjamin Herrenschmidt 
Cc: Chen Liqin 
Cc: Lennox Wu 
Cc: Ingo Molnar 
Cc: Thomas Gleixner 
Cc: "H. Peter Anvin" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds