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  1. 28 Jan, 2016 2 commits
    • Aneesh Kumar K.V's avatar
      powerpc/mm: Fixup _HPAGE_CHG_MASK · 2d19fc63
      Aneesh Kumar K.V authored 
      This was wrongly updated by commit 7aa9a23c ("powerpc, thp: remove
infrastructure for handling splitting PMDs") during the last merge
window. Fix it up.

This could lead to incorrect behaviour in THP and/or mprotect(), at a
minimum.

Fixes: 7aa9a23c ("powerpc, thp: remove infrastructure for handling splitting PMDs")
Signed-off-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      2d19fc63
    • Madhavan Srinivasan's avatar
      powerpc/perf: Remove PPMU_HAS_SSLOT flag for Power8 · 370f06c8
      Madhavan Srinivasan authored 
      Commit 7a786832 ("powerpc/perf: Add an explict flag indicating
presence of SLOT field") introduced the PPMU_HAS_SSLOT flag to remove
the assumption that MMCRA[SLOT] was present when PPMU_ALT_SIPR was not
set.

That commit's changelog also mentions that Power8 does not support
MMCRA[SLOT]. However when the Power8 PMU support was merged, it
errnoeously included the PPMU_HAS_SSLOT flag.

So remove PPMU_HAS_SSLOT from the Power8 flags.

mpe: On systems where MMCRA[SLOT] exists, the field occupies bits 37:39
(IBM numbering). On Power8 bit 37 is reserved, and 38:39 overlap with
the high bits of the Threshold Event Counter Mantissa. I am not aware of
any published events which use the threshold counting mechanism, which
would cause the mantissa bits to be set. So in practice this bug is
unlikely to trigger.

Fixes: e05b9b9e ("powerpc/perf: Power8 PMU support")
Signed-off-by: default avatarMadhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      370f06c8
  3. 27 Jan, 2016 1 commit
  5. 25 Jan, 2016 1 commit
  7. 21 Jan, 2016 3 commits
    • Stephen Rothwell's avatar
      powerpc: Remove newly added extra definition of pmd_dirty · 0e2bce74
      Stephen Rothwell authored 
      Commit d5d6a443 ("arch/powerpc/include/asm/pgtable-ppc64.h:
add pmd_[dirty|mkclean] for THP") added a new identical definition
of pmd_dirty(). Remove it again.

Cc: Minchan Kim <minchan@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      0e2bce74
    • Alan Modra's avatar
      powerpc: Simplify module TOC handling · c153693d
      Alan Modra authored 
      PowerPC64 uses the symbol .TOC. much as other targets use
_GLOBAL_OFFSET_TABLE_. It identifies the value of the GOT pointer (or in
powerpc parlance, the TOC pointer). Global offset tables are generally
local to an executable or shared library, or in the kernel, module. Thus
it does not make sense for a module to resolve a relocation against
.TOC. to the kernel's .TOC. value. A module has its own .TOC., and
indeed the powerpc64 module relocation processing ignores the kernel
value of .TOC. and instead calculates a module-local value.

This patch removes code involved in exporting the kernel .TOC., tweaks
modpost to ignore an undefined .TOC., and the module loader to twiddle
the section symbol so that .TOC. isn't seen as undefined.

Note that if the kernel was compiled with -msingle-pic-base then ELFv2
would not have function global entry code setting up r2. In that case
the module call stubs would need to be modified to set up r2 using the
kernel .TOC. value, requiring some of this code to be reinstated.

mpe: Furthermore a change in binutils master (not yet released) causes
the current way we handle the TOC to no longer work when building with
MODVERSIONS=y and RELOCATABLE=n. The symptom is that modules can not be
loaded due to there being no version found for TOC.

Cc: stable@vger.kernel.org # 3.16+
Signed-off-by: default avatarAlan Modra <amodra@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      c153693d
    • Chandan Rajendra's avatar
      powerpc: Wire up copy_file_range() syscall · d7f9ee60
      Chandan Rajendra authored 
      Test runs on a ppc64 BE guest succeeded using modified fstests.

Also tested on ppc64 LE using a home made test - mpe.
Signed-off-by: default avatarChandan Rajendra <chandan@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      d7f9ee60
  9. 20 Jan, 2016 24 commits
  11. 19 Jan, 2016 9 commits
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