linux.git/arch/unicore32/include, branch v3.18.111

Make asm/word-at-a-time.h available on all architectures

2017-08-11T16:30:13+00:00

commit a6e2f029ae34f41adb6ae3812c32c5d326e1abd2 upstream.

Added the x86 implementation of word-at-a-time to the
generic version, which previously only supported big-endian.

Omitted the x86-specific load_unaligned_zeropad(), which in
any case is also not present for the existing BE-only
implementation of a word-at-a-time, and is only used under
CONFIG_DCACHE_WORD_ACCESS.

Added as a "generic-y" to the Kbuilds of all architectures
that didn't previously have it.

Signed-off-by: Chris Metcalf 
Signed-off-by: Greg Kroah-Hartman

nosave: consolidate __nosave_{begin,end} in

2014-10-10T02:26:04+00:00

The different architectures used their own (and different) declarations:

    extern __visible const void __nosave_begin, __nosave_end;
    extern const void __nosave_begin, __nosave_end;
    extern long __nosave_begin, __nosave_end;

Consolidate them using the first variant in .

Signed-off-by: Geert Uytterhoeven 
Cc: Russell King 
Cc: Ralf Baechle 
Cc: Benjamin Herrenschmidt 
Cc: Martin Schwidefsky 
Cc: "David S. Miller" 
Cc: Guan Xuetao 
Cc: Thomas Gleixner 
Cc: Ingo Molnar 
Cc: "H. Peter Anvin" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

irq_work: Introduce arch_irq_work_has_interrupt()

2014-09-13T16:38:07+00:00

The nohz full code needs irq work to trigger its own interrupt so that
the subsystem can work even when the tick is stopped.

Lets introduce arch_irq_work_has_interrupt() that archs can override to
tell about their support for this ability.

Signed-off-by: Peter Zijlstra 
Cc: Ingo Molnar 
Cc: Paul E. McKenney 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Signed-off-by: Frederic Weisbecker

arch, locking: Ciao arch_mutex_cpu_relax()

2014-07-17T10:32:47+00:00

The arch_mutex_cpu_relax() function, introduced by 34b133f, is
hacky and ugly. It was added a few years ago to address the fact
that common cpu_relax() calls include yielding on s390, and thus
impact the optimistic spinning functionality of mutexes. Nowadays
we use this function well beyond mutexes: rwsem, qrwlock, mcs and
lockref. Since the macro that defines the call is in the mutex header,
any users must include mutex.h and the naming is misleading as well.

This patch (i) renames the call to cpu_relax_lowlatency  ("relax, but
only if you can do it with very low latency") and (ii) defines it in
each arch's asm/processor.h local header, just like for regular cpu_relax
functions. On all archs, except s390, cpu_relax_lowlatency is simply cpu_relax,
and thus we can take it out of mutex.h. While this can seem redundant,
I believe it is a good choice as it allows us to move out arch specific
logic from generic locking primitives and enables future(?) archs to
transparently define it, similarly to System Z.

Signed-off-by: Davidlohr Bueso 
Signed-off-by: Peter Zijlstra 
Cc: Andrew Morton 
Cc: Anton Blanchard 
Cc: Aurelien Jacquiot 
Cc: Benjamin Herrenschmidt 
Cc: Bharat Bhushan 
Cc: Catalin Marinas 
Cc: Chen Liqin 
Cc: Chris Metcalf 
Cc: Christian Borntraeger 
Cc: Chris Zankel 
Cc: David Howells 
Cc: David S. Miller 
Cc: Deepthi Dharwar 
Cc: Dominik Dingel 
Cc: Fenghua Yu 
Cc: Geert Uytterhoeven 
Cc: Guan Xuetao 
Cc: Haavard Skinnemoen 
Cc: Hans-Christian Egtvedt 
Cc: Heiko Carstens 
Cc: Helge Deller 
Cc: Hirokazu Takata 
Cc: Ivan Kokshaysky 
Cc: James E.J. Bottomley 
Cc: James Hogan 
Cc: Jason Wang 
Cc: Jesper Nilsson 
Cc: Joe Perches 
Cc: Jonas Bonn 
Cc: Joseph Myers 
Cc: Kees Cook 
Cc: Koichi Yasutake 
Cc: Lennox Wu 
Cc: Linus Torvalds 
Cc: Mark Salter 
Cc: Martin Schwidefsky 
Cc: Matt Turner 
Cc: Max Filippov 
Cc: Michael Neuling 
Cc: Michal Simek 
Cc: Mikael Starvik 
Cc: Nicolas Pitre 
Cc: Paolo Bonzini 
Cc: Paul Burton 
Cc: Paul E. McKenney 
Cc: Paul Gortmaker 
Cc: Paul Mackerras 
Cc: Qais Yousef 
Cc: Qiaowei Ren 
Cc: Rafael Wysocki 
Cc: Ralf Baechle 
Cc: Richard Henderson 
Cc: Richard Kuo 
Cc: Russell King 
Cc: Steven Miao 
Cc: Steven Rostedt 
Cc: Stratos Karafotis 
Cc: Tim Chen 
Cc: Tony Luck 
Cc: Vasily Kulikov 
Cc: Vineet Gupta 
Cc: Vineet Gupta 
Cc: Waiman Long 
Cc: Will Deacon 
Cc: Wolfram Sang 
Cc: adi-buildroot-devel@lists.sourceforge.net
Cc: linux390@de.ibm.com
Cc: linux-alpha@vger.kernel.org
Cc: linux-am33-list@redhat.com
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-c6x-dev@linux-c6x.org
Cc: linux-cris-kernel@axis.com
Cc: linux-hexagon@vger.kernel.org
Cc: linux-ia64@vger.kernel.org
Cc: linux@lists.openrisc.net
Cc: linux-m32r-ja@ml.linux-m32r.org
Cc: linux-m32r@ml.linux-m32r.org
Cc: linux-m68k@lists.linux-m68k.org
Cc: linux-metag@vger.kernel.org
Cc: linux-mips@linux-mips.org
Cc: linux-parisc@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-s390@vger.kernel.org
Cc: linux-sh@vger.kernel.org
Cc: linux-xtensa@linux-xtensa.org
Cc: sparclinux@vger.kernel.org
Link: http://lkml.kernel.org/r/1404079773.2619.4.camel@buesod1.americas.hpqcorp.net
Signed-off-by: Ingo Molnar

arch:unicore32:mm: add devmem_is_allowed() to support STRICT_DEVMEM

2014-06-20T00:22:40+00:00

unicore32 supports STRICT_DEVMEM, so it needs devmem_is_allowed(), like
some of other architectures have done (e.g. arm, powerpc, x86 ...).

The related error with allmodconfig:

    CC      drivers/char/mem.o
  drivers/char/mem.c: In function ârange_is_allowedâ:
  drivers/char/mem.c:69: error: implicit declaration of function âdevmem_is_allowedâ
  make[2]: *** [drivers/char/mem.o] Error 1
  make[1]: *** [drivers/char] Error 2
  make: *** [drivers] Error 2

Signed-off-by: Chen Gang 
Acked-by: Xuetao Guan 
Signed-off-by: Xuetao Guan

unicore32: include: asm: add missing ')' for PAGE_* macros in pgtable.h

2014-06-20T00:22:40+00:00

Missing related ')', the related compiling error:

    CC [M]  drivers/gpu/drm/udl/udl_fb.o
  drivers/gpu/drm/udl/udl_fb.c: In function Â‘udl_fb_mmapÂ’:
  drivers/gpu/drm/udl/udl_fb.c:273: error: expected Â‘)Â’ before Â‘returnÂ’
  drivers/gpu/drm/udl/udl_fb.c:281: error: expected expression before Â‘}Â’ token
  make[4]: *** [drivers/gpu/drm/udl/udl_fb.o] Error 1
  make[3]: *** [drivers/gpu/drm/udl] Error 2
  make[2]: *** [drivers/gpu/drm] Error 2
  make[1]: *** [drivers/gpu] Error 2
  make: *** [drivers] Error 2

Signed-off-by: Chen Gang 
Acked-by: Xuetao Guan 
Signed-off-by: Xuetao Guan

arch/unicore32/include/asm/io.h: add readl_relaxed() generic definition

2014-06-20T00:22:38+00:00

Need generic definition for readl_relaxed(), like other architectures
have done. Or can not pass compiling with allmodconfig, the related
error:

    CC [M]  drivers/message/fusion/mptbase.o
  drivers/message/fusion/mptbase.c: In function 'mpt_send_handshake_request':
  drivers/message/fusion/mptbase.c:1224: error: implicit declaration of function 'readl_relaxed'

Signed-off-by: Chen Gang 
Acked-by: Xuetao Guan 
Signed-off-by: Xuetao Guan

arch/unicore32/include/asm/ptrace.h: add generic definition for profile_pc()

2014-06-20T00:22:38+00:00

Add generic definition just like another architectures have done, or
can not pass compiling with allmodconfig, the related error:

    CC      kernel/profile.o
  kernel/profile.c: In function 'profile_tick':
  kernel/profile.c:419: error: implicit declaration of function 'profile_pc'
  make[1]: *** [kernel/profile.o] Error 1
  make: *** [kernel] Error 2

Signed-off-by: Chen Gang 
Acked-by: Xuetao Guan 
Signed-off-by: Xuetao Guan

PCI: Turn pcibios_penalize_isa_irq() into a weak function

2014-05-27T22:23:58+00:00

pcibios_penalize_isa_irq() is only implemented by x86 now, and legacy ISA
is not used by some architectures.  Make pcibios_penalize_isa_irq() a
__weak function to simplify the code.  This removes the need for new
platforms to add stub implementations of pcibios_penalize_isa_irq().

[bhelgaas: changelog, comments]
Signed-off-by: Hanjun Guo 
Signed-off-by: Bjorn Helgaas 
Acked-by: Arnd Bergmann

mm: per-thread vma caching

2014-04-07T23:35:53+00:00

This patch is a continuation of efforts trying to optimize find_vma(),
avoiding potentially expensive rbtree walks to locate a vma upon faults.
The original approach (https://lkml.org/lkml/2013/11/1/410), where the
largest vma was also cached, ended up being too specific and random,
thus further comparison with other approaches were needed.  There are
two things to consider when dealing with this, the cache hit rate and
the latency of find_vma().  Improving the hit-rate does not necessarily
translate in finding the vma any faster, as the overhead of any fancy
caching schemes can be too high to consider.

We currently cache the last used vma for the whole address space, which
provides a nice optimization, reducing the total cycles in find_vma() by
up to 250%, for workloads with good locality.  On the other hand, this
simple scheme is pretty much useless for workloads with poor locality.
Analyzing ebizzy runs shows that, no matter how many threads are
running, the mmap_cache hit rate is less than 2%, and in many situations
below 1%.

The proposed approach is to replace this scheme with a small per-thread
cache, maximizing hit rates at a very low maintenance cost.
Invalidations are performed by simply bumping up a 32-bit sequence
number.  The only expensive operation is in the rare case of a seq
number overflow, where all caches that share the same address space are
flushed.  Upon a miss, the proposed replacement policy is based on the
page number that contains the virtual address in question.  Concretely,
the following results are seen on an 80 core, 8 socket x86-64 box:

1) System bootup: Most programs are single threaded, so the per-thread
   scheme does improve ~50% hit rate by just adding a few more slots to
   the cache.

+----------------+----------+------------------+
| caching scheme | hit-rate | cycles (billion) |
+----------------+----------+------------------+
| baseline       | 50.61%   | 19.90            |
| patched        | 73.45%   | 13.58            |
+----------------+----------+------------------+

2) Kernel build: This one is already pretty good with the current
   approach as we're dealing with good locality.

+----------------+----------+------------------+
| caching scheme | hit-rate | cycles (billion) |
+----------------+----------+------------------+
| baseline       | 75.28%   | 11.03            |
| patched        | 88.09%   | 9.31             |
+----------------+----------+------------------+

3) Oracle 11g Data Mining (4k pages): Similar to the kernel build workload.

+----------------+----------+------------------+
| caching scheme | hit-rate | cycles (billion) |
+----------------+----------+------------------+
| baseline       | 70.66%   | 17.14            |
| patched        | 91.15%   | 12.57            |
+----------------+----------+------------------+

4) Ebizzy: There's a fair amount of variation from run to run, but this
   approach always shows nearly perfect hit rates, while baseline is just
   about non-existent.  The amounts of cycles can fluctuate between
   anywhere from ~60 to ~116 for the baseline scheme, but this approach
   reduces it considerably.  For instance, with 80 threads:

+----------------+----------+------------------+
| caching scheme | hit-rate | cycles (billion) |
+----------------+----------+------------------+
| baseline       | 1.06%    | 91.54            |
| patched        | 99.97%   | 14.18            |
+----------------+----------+------------------+

[akpm@linux-foundation.org: fix nommu build, per Davidlohr]
[akpm@linux-foundation.org: document vmacache_valid() logic]
[akpm@linux-foundation.org: attempt to untangle header files]
[akpm@linux-foundation.org: add vmacache_find() BUG_ON]
[hughd@google.com: add vmacache_valid_mm() (from Oleg)]
[akpm@linux-foundation.org: coding-style fixes]
[akpm@linux-foundation.org: adjust and enhance comments]
Signed-off-by: Davidlohr Bueso 
Reviewed-by: Rik van Riel 
Acked-by: Linus Torvalds 
Reviewed-by: Michel Lespinasse 
Cc: Oleg Nesterov 
Tested-by: Hugh Dickins 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds