litmus-rt.git/arch/x86/kernel/cpu/mtrr, branch master

x86: mtrr: if: remove use of seq_printf return value

2015-04-15T23:35:24+00:00

The seq_printf return value, because it's frequently misused,
will eventually be converted to void.

See: commit 1f33c41c03da ("seq_file: Rename seq_overflow() to
     seq_has_overflowed() and make public")

Signed-off-by: Joe Perches 
Cc: Thomas Gleixner 
Cc: Ingo Molnar 
Cc: "H. Peter Anvin" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

x86: Store a per-cpu shadow copy of CR4

2015-02-04T11:10:42+00:00

Context switches and TLB flushes can change individual bits of CR4.
CR4 reads take several cycles, so store a shadow copy of CR4 in a
per-cpu variable.

To avoid wasting a cache line, I added the CR4 shadow to
cpu_tlbstate, which is already touched in switch_mm.  The heaviest
users of the cr4 shadow will be switch_mm and __switch_to_xtra, and
__switch_to_xtra is called shortly after switch_mm during context
switch, so the cacheline is likely to be hot.

Signed-off-by: Andy Lutomirski 
Reviewed-by: Thomas Gleixner 
Signed-off-by: Peter Zijlstra (Intel) 
Cc: Kees Cook 
Cc: Andrea Arcangeli 
Cc: Vince Weaver 
Cc: "hillf.zj" 
Cc: Valdis Kletnieks 
Cc: Paul Mackerras 
Cc: Arnaldo Carvalho de Melo 
Cc: Linus Torvalds 
Link: http://lkml.kernel.org/r/3a54dd3353fffbf84804398e00dfdc5b7c1afd7d.1414190806.git.luto@amacapital.net
Signed-off-by: Ingo Molnar

x86: Add more disabled features

2014-09-11T21:30:17+00:00

The original motivation for these patches was for an Intel CPU
feature called MPX.  The patch to add a disabled feature for it
will go in with the other parts of the support.

But, in the meantime, there are a few other features than MPX
that we can make assumptions about at compile-time based on
compile options.  Add them to disabled-features.h and check them
with cpu_feature_enabled().

Note that this gets rid of the last things that needed an #ifdef
CONFIG_X86_64 in cpufeature.h.  Yay!

Signed-off-by: Dave Hansen 
Link: http://lkml.kernel.org/r/20140911211524.C0EC332A@viggo.jf.intel.com
Acked-by: Borislav Petkov 
Signed-off-by: H. Peter Anvin

mm, x86: Account for TLB flushes only when debugging

2014-01-25T08:10:41+00:00

Bisection between 3.11 and 3.12 fingered commit 9824cf97 ("mm:
vmstats: tlb flush counters") to cause overhead problems.

The counters are undeniably useful but how often do we really
need to debug TLB flush related issues?  It does not justify
taking the penalty everywhere so make it a debugging option.

Signed-off-by: Mel Gorman 
Tested-by: Davidlohr Bueso 
Reviewed-by: Rik van Riel 
Signed-off-by: Andrew Morton 
Cc: Hugh Dickins 
Cc: Alex Shi 
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Link: http://lkml.kernel.org/n/tip-XzxjntugxuwpxXhcrxqqh53b@git.kernel.org
Signed-off-by: Ingo Molnar

mm: vmstats: track TLB flush stats on UP too

2013-09-11T22:57:09+00:00

The previous patch doing vmstats for TLB flushes ("mm: vmstats: tlb flush
counters") effectively missed UP since arch/x86/mm/tlb.c is only compiled
for SMP.

UP systems do not do remote TLB flushes, so compile those counters out on
UP.

arch/x86/kernel/cpu/mtrr/generic.c calls __flush_tlb() directly.  This is
probably an optimization since both the mtrr code and __flush_tlb() write
cr4.  It would probably be safe to make that a flush_tlb_all() (and then
get these statistics), but the mtrr code is ancient and I'm hesitant to
touch it other than to just stick in the counters.

[akpm@linux-foundation.org: tweak comments]
Signed-off-by: Dave Hansen 
Cc: Peter Zijlstra 
Cc: Ingo Molnar 
Cc: "H. Peter Anvin" 
Cc: Thomas Gleixner 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux

2013-07-09T23:04:31+00:00

Pull drm updates from Dave Airlie:
 "Okay this is the big one, I was stalled on the fbdev pull req as I
  stupidly let fbdev guys merge a patch I required to fix a warning with
  some patches I had, they ended up merging the patch from the wrong
  place, but the warning should be fixed.  In future I'll just take the
  patch myself!

  Outside drm:

  There are some snd changes for the HDMI audio interactions on haswell,
  they've been acked for inclusion via my tree.  This relies on the
  wound/wait tree from Ingo which is already merged.

  Major changes:

  AMD finally released the dynamic power management code for all their
  GPUs from r600->present day, this is great, off by default for now but
  also a huge amount of code, in fact it is most of this pull request.

  Since it landed there has been a lot of community testing and Alex has
  sent a lot of fixes for any bugs found so far.  I suspect radeon might
  now be the biggest kernel driver ever :-P p.s.  radeon.dpm=1 to enable
  dynamic powermanagement for anyone.

  New drivers:

  Renesas r-car display unit.

  Other highlights:

   - core: GEM CMA prime support, use new w/w mutexs for TTM
     reservations, cursor hotspot, doc updates
   - dvo chips: chrontel 7010B support
   - i915: Haswell (fbc, ips, vecs, watermarks, audio powerwell),
     Valleyview (enabled by default, rc6), lots of pll reworking, 30bpp
     support (this time for sure)
   - nouveau: async buffer object deletion, context/register init
     updates, kernel vp2 engine support, GF117 support, GK110 accel
     support (with external nvidia ucode), context cleanups.
   - exynos: memory leak fixes, Add S3C64XX SoC series support, device
     tree updates, common clock framework support,
   - qxl: cursor hotspot support, multi-monitor support, suspend/resume
     support
   - mgag200: hw cursor support, g200 mode limiting
   - shmobile: prime support
   - tegra: fixes mostly

  I've been banging on this quite a lot due to the size of it, and it
  seems to okay on everything I've tested it on."

* 'drm-next' of git://people.freedesktop.org/~airlied/linux: (811 commits)
  drm/radeon/dpm: implement vblank_too_short callback for si
  drm/radeon/dpm: implement vblank_too_short callback for cayman
  drm/radeon/dpm: implement vblank_too_short callback for btc
  drm/radeon/dpm: implement vblank_too_short callback for evergreen
  drm/radeon/dpm: implement vblank_too_short callback for 7xx
  drm/radeon/dpm: add checks against vblank time
  drm/radeon/dpm: add helper to calculate vblank time
  drm/radeon: remove stray line in old pm code
  drm/radeon/dpm: fix display_gap programming on rv7xx
  drm/nvc0/gr: fix gpc firmware regression
  drm/nouveau: fix minor thinko causing bo moves to not be async on kepler
  drm/radeon/dpm: implement force performance level for TN
  drm/radeon/dpm: implement force performance level for ON/LN
  drm/radeon/dpm: implement force performance level for SI
  drm/radeon/dpm: implement force performance level for cayman
  drm/radeon/dpm: implement force performance levels for 7xx/eg/btc
  drm/radeon/dpm: add infrastructure to force performance levels
  drm/radeon: fix surface setup on r1xx
  drm/radeon: add support for 3d perf states on older asics
  drm/radeon: set default clocks for SI when DPM is disabled
  ...

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

2013-07-02T23:29:05+00:00

Pull x86 mm changes from Ingo Molnar:
 "Misc improvements:

   - Fix /proc/mtrr reporting
   - Fix ioremap printout
   - Remove the unused pvclock fixmap entry on 32-bit
   - misc cleanups"

* 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/ioremap: Correct function name output
  x86: Fix /proc/mtrr with base/size more than 44bits
  ix86: Don't waste fixmap entries
  x86/mm: Drop unneeded include 
  x86_64: Correct phys_addr in cleanup_highmap comment

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

2013-07-02T23:21:45+00:00

Pull asm/x86 changes from Ingo Molnar:
 "Misc changes, with a bigger processor-flags cleanup/reorganization by
  Peter Anvin"

* 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86, asm, cleanup: Replace open-coded control register values with symbolic
  x86, processor-flags: Fix the datatypes and add bit number defines
  x86: Rename X86_CR4_RDWRGSFS to X86_CR4_FSGSBASE
  x86, flags: Rename X86_EFLAGS_BIT1 to X86_EFLAGS_FIXED
  linux/const.h: Add _BITUL() and _BITULL()
  x86/vdso: Convert use of typedef ctl_table to struct ctl_table
  x86: __force_order doesn't need to be an actual variable

Merge tag 'v3.10-rc7' into drm-next

2013-06-27T10:40:44+00:00

Linux 3.10-rc7

The sdvo lvds fix in this -fixes pull

commit c3456fb3e4712d0448592af3c5d644c9472cd3c1
Author: Daniel Vetter 
Date:   Mon Jun 10 09:47:58 2013 +0200

    drm/i915: prefer VBT modes for SVDO-LVDS over EDID

has a silent functional conflict with

commit 990256aec2f10800595dddf4d1c3441fcd6b2616
Author: Ville Syrjälä 
Date:   Fri May 31 12:17:07 2013 +0000

    drm: Add probed modes in probe order

in drm-next. W simply need to add the vbt modes before edid modes, i.e. the
other way round than now.

Conflicts:
	drivers/gpu/drm/drm_prime.c
	drivers/gpu/drm/i915/intel_sdvo.c

x86, asm, cleanup: Replace open-coded control register values with symbolic

2013-06-25T23:26:06+00:00

Clean up an unnecessary open-coded control register values.

Signed-off-by: H. Peter Anvin 
Link: http://lkml.kernel.org/n/tip-um7za1nzf6brb17o0h4om6e3@git.kernel.org