linux-stable.git/arch/s390/kernel, branch linux-4.7.y

Revert "s390/kdump: Clear subchannel ID to signal non-CCW/SCSI IPL"

2016-06-28T07:24:27+00:00

This reverts commit 852ffd0f4e23248b47531058e531066a988434b5.

There are use cases where an intermediate boot kernel (1) uses kexec
to boot the final production kernel (2). For this scenario we should
provide the original boot information to the production kernel (2).
Therefore clearing the boot information during kexec() should not
be done.

Cc: stable@vger.kernel.org # v3.17+
Reported-by: Steffen Maier 
Signed-off-by: Michael Holzheu 
Reviewed-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

s390/cpum_cf: use perf software context for hardware counters

2016-06-16T10:08:49+00:00

On s390, there are two different hardware PMUs for counting and
sampling.  Previously, both PMUs have shared the perf_hw_context
which is not correct and, recently, results in this warning:

    ------------[ cut here ]------------
    WARNING: CPU: 5 PID: 1 at kernel/events/core.c:8485 perf_pmu_register+0x420/0x428
    Modules linked in:
    CPU: 5 PID: 1 Comm: swapper/0 Not tainted 4.7.0-rc1+ #2
    task: 00000009c5240000 ti: 00000009c5234000 task.ti: 00000009c5234000
    Krnl PSW : 0704c00180000000 0000000000220c50 (perf_pmu_register+0x420/0x428)
               R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:0 PM:0 RI:0 EA:3
    Krnl GPRS: ffffffffffffffff 0000000000b15ac6 0000000000000000 00000009cb440000
               000000000022087a 0000000000000000 0000000000b78fa0 0000000000000000
               0000000000a9aa90 0000000000000084 0000000000000005 000000000088a97a
               0000000000000004 0000000000749dd0 000000000022087a 00000009c5237cc0
    Krnl Code: 0000000000220c44: a7f4ff54            brc     15,220aec
               0000000000220c48: 92011000           mvi     0(%r1),1
              #0000000000220c4c: a7f40001           brc     15,220c4e
              >0000000000220c50: a7f4ff12           brc     15,220a74
               0000000000220c54: 0707               bcr     0,%r7
               0000000000220c56: 0707               bcr     0,%r7
               0000000000220c58: ebdff0800024       stmg    %r13,%r15,128(%r15)
               0000000000220c5e: a7f13fe0           tmll    %r15,16352
    Call Trace:
    ([<000000000022087a>] perf_pmu_register+0x4a/0x428)
    ([<0000000000b2c25c>] init_cpum_sampling_pmu+0x14c/0x1f8)
    ([<0000000000100248>] do_one_initcall+0x48/0x140)
    ([<0000000000b25d26>] kernel_init_freeable+0x1e6/0x2a0)
    ([<000000000072bda4>] kernel_init+0x24/0x138)
    ([<000000000073495e>] kernel_thread_starter+0x6/0xc)
    ([<0000000000734958>] kernel_thread_starter+0x0/0xc)
    Last Breaking-Event-Address:
     [<0000000000220c4c>] perf_pmu_register+0x41c/0x428
    ---[ end trace 0c6ef9f5b771ad97 ]---

Using the perf_sw_context is an option because the cpum_cf PMU does
not use interrupts.  To make this more clear, initialize the
capabilities in the PMU structure.

Signed-off-by: Hendrik Brueckner 
Suggested-by: Peter Zijlstra 
Acked-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

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

2016-05-26T00:05:40+00:00

Pull perf updates from Ingo Molnar:
 "Mostly tooling and PMU driver fixes, but also a number of late updates
  such as the reworking of the call-chain size limiting logic to make
  call-graph recording more robust, plus tooling side changes for the
  new 'backwards ring-buffer' extension to the perf ring-buffer"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (34 commits)
  perf record: Read from backward ring buffer
  perf record: Rename variable to make code clear
  perf record: Prevent reading invalid data in record__mmap_read
  perf evlist: Add API to pause/resume
  perf trace: Use the ptr->name beautifier as default for "filename" args
  perf trace: Use the fd->name beautifier as default for "fd" args
  perf report: Add srcline_from/to branch sort keys
  perf evsel: Record fd into perf_mmap
  perf evsel: Add overwrite attribute and check write_backward
  perf tools: Set buildid dir under symfs when --symfs is provided
  perf trace: Only auto set call-graph to "dwarf" when syscalls are being traced
  perf annotate: Sort list of recognised instructions
  perf annotate: Fix identification of ARM blt and bls instructions
  perf tools: Fix usage of max_stack sysctl
  perf callchain: Stop validating callchains by the max_stack sysctl
  perf trace: Fix exit_group() formatting
  perf top: Use machine->kptr_restrict_warned
  perf trace: Warn when trying to resolve kernel addresses with kptr_restrict=1
  perf machine: Do not bail out if not managing to read ref reloc symbol
  perf/x86/intel/p4: Trival indentation fix, remove space
  ...

vdso: make arch_setup_additional_pages wait for mmap_sem for write killable

2016-05-24T00:04:14+00:00

most architectures are relying on mmap_sem for write in their
arch_setup_additional_pages.  If the waiting task gets killed by the oom
killer it would block oom_reaper from asynchronous address space reclaim
and reduce the chances of timely OOM resolving.  Wait for the lock in
the killable mode and return with EINTR if the task got killed while
waiting.

Signed-off-by: Michal Hocko 
Acked-by: Andy Lutomirski 	[x86 vdso]
Acked-by: Vlastimil Babka 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

s390/kexec: consolidate crash_map/unmap_reserved_pages() and arch_kexec_protect(unprotect)_crashkres()

2016-05-24T00:04:14+00:00

Commit 3f625002581b ("kexec: introduce a protection mechanism for the
crashkernel reserved memory") is a similar mechanism for protecting the
crash kernel reserved memory to previous crash_map/unmap_reserved_pages()
implementation, the new one is more generic in name and cleaner in code
(besides, some arch may not be allowed to unmap the pgtable).

Therefore, this patch consolidates them, and uses the new
arch_kexec_protect(unprotect)_crashkres() to replace former
crash_map/unmap_reserved_pages() which by now has been only used by
S390.

The consolidation work needs the crash memory to be mapped initially,
this is done in machine_kdump_pm_init() which is after
reserve_crashkernel().  Once kdump kernel is loaded, the new
arch_kexec_protect_crashkres() implemented for S390 will actually
unmap the pgtable like before.

Signed-off-by: Xunlei Pang 
Signed-off-by: Michael Holzheu 
Acked-by: Michael Holzheu 
Cc: Heiko Carstens 
Cc: "Eric W. Biederman" 
Cc: Minfei Huang 
Cc: Vivek Goyal 
Cc: Dave Young 
Cc: Baoquan He 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

exit_thread: accept a task parameter to be exited

2016-05-21T00:58:30+00:00

We need to call exit_thread from copy_process in a fail path.  So make it
accept task_struct as a parameter.

[v2]
* s390: exit_thread_runtime_instr doesn't make sense to be called for
  non-current tasks.
* arm: fix the comment in vfp_thread_copy
* change 'me' to 'tsk' for task_struct
* now we can change only archs that actually have exit_thread

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Jiri Slaby 
Cc: "David S. Miller" 
Cc: "H. Peter Anvin" 
Cc: "James E.J. Bottomley" 
Cc: Aurelien Jacquiot 
Cc: Benjamin Herrenschmidt 
Cc: Catalin Marinas 
Cc: Chen Liqin 
Cc: Chris Metcalf 
Cc: Chris Zankel 
Cc: David Howells 
Cc: Fenghua Yu 
Cc: Geert Uytterhoeven 
Cc: Guan Xuetao 
Cc: Haavard Skinnemoen 
Cc: Hans-Christian Egtvedt 
Cc: Heiko Carstens 
Cc: Helge Deller 
Cc: Ingo Molnar 
Cc: Ivan Kokshaysky 
Cc: James Hogan 
Cc: Jeff Dike 
Cc: Jesper Nilsson 
Cc: Jiri Slaby 
Cc: Jonas Bonn 
Cc: Koichi Yasutake 
Cc: Lennox Wu 
Cc: Ley Foon Tan 
Cc: Mark Salter 
Cc: Martin Schwidefsky 
Cc: Matt Turner 
Cc: Max Filippov 
Cc: Michael Ellerman 
Cc: Michal Simek 
Cc: Mikael Starvik 
Cc: Paul Mackerras 
Cc: Peter Zijlstra 
Cc: Ralf Baechle 
Cc: Rich Felker 
Cc: Richard Henderson 
Cc: Richard Kuo 
Cc: Richard Weinberger 
Cc: Russell King 
Cc: Steven Miao 
Cc: Thomas Gleixner 
Cc: Tony Luck 
Cc: Vineet Gupta 
Cc: Will Deacon 
Cc: Yoshinori Sato 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Merge tag 'perf-core-for-mingo-20160516' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core

2016-05-20T06:20:14+00:00

Pull perf/core improvements and fixes from Arnaldo Carvalho de Melo:

User visible changes:

- Honour the kernel.perf_event_max_stack knob more precisely by not counting
  PERF_CONTEXT_{KERNEL,USER} when deciding when to stop adding entries to
  the perf_sample->ip_callchain[] array (Arnaldo Carvalho de Melo)

- Fix identation of 'stalled-backend-cycles' in 'perf stat' (Namhyung Kim)

- Update runtime using 'cpu-clock' event in 'perf stat' (Namhyung Kim)

- Use 'cpu-clock' for cpu targets in 'perf stat' (Namhyung Kim)

- Avoid fractional digits for integer scales in 'perf stat' (Andi Kleen)

- Store vdso buildid unconditionally, as it appears in callchains and
  we're not checking those when creating the build-id table, so we
  end up not being able to resolve VDSO symbols when doing analysis
  on a different machine than the one where recording was done, possibly
  of a different arch even (arm -> x86_64) (He Kuang)

Infrastructure changes:

- Generalize max_stack sysctl handler, will be used for configuring
  multiple kernel knobs related to callchains (Arnaldo Carvalho de Melo)

Cleanups:

- Introduce DSO__NAME_KALLSYMS and DSO__NAME_KCORE, to stop using
  open coded strings (Masami Hiramatsu)

Signed-off-by: Arnaldo Carvalho de Melo 
Signed-off-by: Ingo Molnar

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

2016-05-18T19:17:16+00:00

Pull s390 updates from Martin Schwidefsky:
 "The s390 patches for the 4.7 merge window have the usual bug fixes and
  cleanups, and the following new features:

   - An interface for dasd driver to query if a volume is online to
     another operating system

   - A new ioctl for the dasd driver to verify the format for a range of
     tracks

   - Following the example of x86 the struct fpu is now allocated with
     the task_struct

   - The 'report_error' interface for the PCI bus to send an
     adapter-error notification from user space to the service element
     of the machine"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (29 commits)
  s390/vmem: remove unused function parameter
  s390/vmem: fix identity mapping
  s390: add missing include statements
  s390: add missing declarations
  s390: make couple of variables and functions static
  s390/cache: remove superfluous locking
  s390/cpuinfo: simplify locking and skip offline cpus early
  s390/3270: hangup the 3270 tty after a disconnect
  s390/3270: handle reconnect of a tty with a different size
  s390/3270: avoid endless I/O loop with disconnected 3270 terminals
  s390/3270: fix garbled output on 3270 tty view
  s390/3270: fix view reference counting
  s390/3270: add missing tty_kref_put
  s390/dumpstack: implement and use return_address()
  s390/cpum_sf: Remove superfluous SMP function call
  s390/cpum_cf: Remove superfluous SMP function call
  s390/Kconfig: make z196 the default processor type
  s390/sclp: avoid compile warning in sclp_pci_report
  s390/fpu: allocate 'struct fpu' with the task_struct
  s390/crypto: cleanup and move the header with the cpacf definitions
  ...

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/livepatching

2016-05-18T00:11:27+00:00

Pull livepatching updates from Jiri Kosina:

 - remove of our own implementation of architecture-specific relocation
   code and leveraging existing code in the module loader to perform
   arch-dependent work, from Jessica Yu.

   The relevant patches have been acked by Rusty (for module.c) and
   Heiko (for s390).

 - live patching support for ppc64le, which is a joint work of Michael
   Ellerman and Torsten Duwe.  This is coming from topic branch that is
   share between livepatching.git and ppc tree.

 - addition of livepatching documentation from Petr Mladek

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/livepatching:
  livepatch: make object/func-walking helpers more robust
  livepatch: Add some basic livepatch documentation
  powerpc/livepatch: Add live patching support on ppc64le
  powerpc/livepatch: Add livepatch stack to struct thread_info
  powerpc/livepatch: Add livepatch header
  livepatch: Allow architectures to specify an alternate ftrace location
  ftrace: Make ftrace_location_range() global
  livepatch: robustify klp_register_patch() API error checking
  Documentation: livepatch: outline Elf format and requirements for patch modules
  livepatch: reuse module loader code to write relocations
  module: s390: keep mod_arch_specific for livepatch modules
  module: preserve Elf information for livepatch modules
  Elf: add livepatch-specific Elf constants

perf core: Pass max stack as a perf_callchain_entry context

2016-05-17T02:11:50+00:00

This makes perf_callchain_{user,kernel}() receive the max stack
as context for the perf_callchain_entry, instead of accessing
the global sysctl_perf_event_max_stack.

Cc: Adrian Hunter 
Cc: Alexander Shishkin 
Cc: Alexei Starovoitov 
Cc: Brendan Gregg 
Cc: David Ahern 
Cc: Frederic Weisbecker 
Cc: He Kuang 
Cc: Jiri Olsa 
Cc: Linus Torvalds 
Cc: Masami Hiramatsu 
Cc: Milian Wolff 
Cc: Namhyung Kim 
Cc: Peter Zijlstra 
Cc: Stephane Eranian 
Cc: Thomas Gleixner 
Cc: Vince Weaver 
Cc: Wang Nan 
Cc: Zefan Li 
Link: http://lkml.kernel.org/n/tip-kolmn1yo40p7jhswxwrc7rrd@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo