linux.git/arch/mips, branch v4.18-rc2

MIPS: Wire up io_pgetevents syscall

2018-06-20T04:14:29+00:00

Wire up the io_pgetevents syscall that was introduced by commit
7a074e96dee6 ("aio: implement io_pgetevents").

Signed-off-by: Paul Burton 
Patchwork: https://patchwork.linux-mips.org/patch/19593/
Cc: James Hogan 
Cc: Ralf Baechle 
Cc: linux-mips@linux-mips.org

MIPS: Wire up the restartable sequences (rseq) syscall

2018-06-20T04:14:09+00:00

Wire up the restartable sequences (rseq) syscall for MIPS. This was
introduced by commit d7822b1e24f2 ("rseq: Introduce restartable
sequences system call") & MIPS now supports the prerequisites.

Signed-off-by: Paul Burton 
Reviewed-by: James Hogan 
Patchwork: https://patchwork.linux-mips.org/patch/19525/
Cc: Ralf Baechle 
Cc: Mathieu Desnoyers 
Cc: Peter Zijlstra 
Cc: Paul E. McKenney 
Cc: Boqun Feng 
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org

MIPS: Add syscall detection for restartable sequences

2018-06-20T04:13:56+00:00

Syscalls are not allowed inside restartable sequences, so add a call to
rseq_syscall() at the very beginning of the system call exit path when
CONFIG_DEBUG_RSEQ=y. This will help us to detect whether there is a
syscall issued erroneously inside a restartable sequence.

Signed-off-by: Paul Burton 
Reviewed-by: James Hogan 
Patchwork: https://patchwork.linux-mips.org/patch/19522/
Cc: Ralf Baechle 
Cc: Mathieu Desnoyers 
Cc: Peter Zijlstra 
Cc: Paul E. McKenney 
Cc: Boqun Feng 
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org

MIPS: Add support for restartable sequences

2018-06-20T04:13:17+00:00

Implement support for restartable sequences on MIPS, which requires 3
simple things:

  - Call rseq_handle_notify_resume() on return to userspace if
    TIF_NOTIFY_RESUME is set.

  - Call rseq_signal_deliver() to fixup the pre-signal stack frame when
    a signal is delivered whilst executing a restartable sequence
    critical section.

  - Select CONFIG_HAVE_RSEQ.

Signed-off-by: Paul Burton 
Reviewed-by: James Hogan 
Patchwork: https://patchwork.linux-mips.org/patch/19523/
Cc: Ralf Baechle 
Cc: Mathieu Desnoyers 
Cc: Peter Zijlstra 
Cc: Paul E. McKenney 
Cc: Boqun Feng 
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org

MIPS: io: Add barrier after register read in inX()

2018-06-20T02:39:19+00:00

While a barrier is present in the outX() functions before the register
write, a similar barrier is missing in the inX() functions after the
register read. This could allow memory accesses following inX() to
observe stale data.

This patch is very similar to commit a1cc7034e33d12dc1 ("MIPS: io: Add
barrier after register read in readX()"). Because war_io_reorder_wmb()
is both used by writeX() and outX(), if readX() need a barrier then so
does inX().

Cc: stable@vger.kernel.org
Signed-off-by: Huacai Chen 
Patchwork: https://patchwork.linux-mips.org/patch/19516/
Signed-off-by: Paul Burton 
Cc: James Hogan 
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang 
Cc: Zhangjin Wu 
Cc: Huacai Chen

mips: ftrace: fix static function graph tracing

2018-06-19T22:00:12+00:00

ftrace_graph_caller was never run after calling ftrace_trace_function,
breaking the function graph tracer. Fix this, bringing it in line with the
x86 implementation.

While we're at it, also streamline the control flow of _mcount a bit to
reduce the number of branches.

This issue was reported before:
https://www.linux-mips.org/archives/linux-mips/2014-11/msg00295.html

Signed-off-by: Matthias Schiffer 
Tested-by: Matt Redfearn 
Patchwork: https://patchwork.linux-mips.org/patch/18929/
Signed-off-by: Paul Burton 
Cc: stable@vger.kernel.org # v3.17+

MIPS: BCM47XX: Enable 74K Core ExternalSync for PCIe erratum

2018-06-18T21:19:50+00:00

The erratum and workaround are described by BCM5300X-ES300-RDS.pdf as
below.

  R10: PCIe Transactions Periodically Fail

    Description: The BCM5300X PCIe does not maintain transaction ordering.
                 This may cause PCIe transaction failure.
    Fix Comment: Add a dummy PCIe configuration read after a PCIe
                 configuration write to ensure PCIe configuration access
                 ordering. Set ES bit of CP0 configu7 register to enable
                 sync function so that the sync instruction is functional.
    Resolution:  hndpci.c: extpci_write_config()
                 hndmips.c: si_mips_init()
                 mipsinc.h CONF7_ES

This is fixed by the CFE MIPS bcmsi chipset driver also for BCM47XX.
Also the dummy PCIe configuration read is already implemented in the
Linux BCMA driver.

Enable ExternalSync in Config7 when CONFIG_BCMA_DRIVER_PCI_HOSTMODE=y
too so that the sync instruction is externalised.

Signed-off-by: Tokunori Ikegami 
Reviewed-by: Paul Burton 
Acked-by: Hauke Mehrtens 
Cc: Chris Packham 
Cc: Rafał Miłecki 
Cc: linux-mips@linux-mips.org
Cc: stable@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/19461/
Signed-off-by: James Hogan

MIPS: pb44: Fix i2c-gpio GPIO descriptor table

2018-06-18T21:19:50+00:00

I used bad names in my clumsiness when rewriting many board
files to use GPIO descriptors instead of platform data. A few
had the platform_device ID set to -1 which would indeed give
the device name "i2c-gpio".

But several had it set to >=0 which gives the names
"i2c-gpio.0", "i2c-gpio.1" ...

Fix the one affected board in the MIPS tree. Sorry.

Fixes: b2e63555592f ("i2c: gpio: Convert to use descriptors")
Reported-by: Simon Guinot 
Signed-off-by: Linus Walleij 
Reviewed-by: Paul Burton 
Cc: Ralf Baechle 
Cc: Wolfram Sang 
Cc: Simon Guinot 
Cc: linux-mips@linux-mips.org
Cc:  # 4.15+
Patchwork: https://patchwork.linux-mips.org/patch/19387/
Signed-off-by: James Hogan

Merge branch 'akpm' (patches from Andrew)

2018-06-14T23:51:42+00:00

Merge more updates from Andrew Morton:

 - MM remainders

 - various misc things

 - kcov updates

* emailed patches from Andrew Morton : (27 commits)
  lib/test_printf.c: call wait_for_random_bytes() before plain %p tests
  hexagon: drop the unused variable zero_page_mask
  hexagon: fix printk format warning in setup.c
  mm: fix oom_kill event handling
  treewide: use PHYS_ADDR_MAX to avoid type casting ULLONG_MAX
  mm: use octal not symbolic permissions
  ipc: use new return type vm_fault_t
  sysvipc/sem: mitigate semnum index against spectre v1
  fault-injection: reorder config entries
  arm: port KCOV to arm
  sched/core / kcov: avoid kcov_area during task switch
  kcov: prefault the kcov_area
  kcov: ensure irq code sees a valid area
  kernel/relay.c: change return type to vm_fault_t
  exofs: avoid VLA in structures
  coredump: fix spam with zero VMA process
  fat: use fat_fs_error() instead of BUG_ON() in __fat_get_block()
  proc: skip branch in /proc/*/* lookup
  mremap: remove LATENCY_LIMIT from mremap to reduce the number of TLB shootdowns
  mm/memblock: add missing include 
  ...

treewide: use PHYS_ADDR_MAX to avoid type casting ULLONG_MAX

2018-06-14T22:55:25+00:00

With PHYS_ADDR_MAX there is now a type safe variant for all bits set.
Make use of it.

Patch created using a semantic patch as follows:

// 
@@
typedef phys_addr_t;
@@
-(phys_addr_t)ULLONG_MAX
+PHYS_ADDR_MAX
// 

Link: http://lkml.kernel.org/r/20180419214204.19322-1-stefan@agner.ch
Signed-off-by: Stefan Agner 
Reviewed-by: Andrew Morton 
Acked-by: Ard Biesheuvel 
Acked-by: Catalin Marinas 	[arm64]
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds