linux-stable.git/arch/mips, branch v3.18.52

MIPS: elf2ecoff: Fix warning due to dead code.

2017-05-08T05:44:12+00:00

commit 2d76e9633b572ae5a64150b638eed77f4afc12db upstream.

  HOSTCC  arch/mips/boot/elf2ecoff
arch/mips/boot/elf2ecoff.c: In function ‘main’:
arch/mips/boot/elf2ecoff.c:271:8: warning: variable ‘shstrtab’ set but not used [-Wunused-but-set-variable]
  char *shstrtab;

Signed-off-by: Ralf Baechle 
Signed-off-by: Arnd Bergmann 
Signed-off-by: Greg Kroah-Hartman

MIPS: elf2ecoff: Ignore PT_MIPS_ABIFLAGS program headers.

2017-05-08T05:44:12+00:00

commit 26f7c4bd05cf34e63a4a794150ab66a40a5a84a9 upstream.

These are generated by very recent toolchains and result in an error
message when attenpting to convert a kernel from ELF to ECOFF.

Signed-off-by: Ralf Baechle 
Signed-off-by: Arnd Bergmann 
Signed-off-by: Greg Kroah-Hartman

MIPS: jz4740: fix build error in irq.h

2017-05-08T05:44:12+00:00

kernelci found build error on the 3.18 stable tree that don't
show up in later versions:

arch/mips/jz4740/irq.h:21:38: error: 'struct irq_data' declared inside parameter list will not be visible outside of this definition or declaration [-Werror]
arch/mips/jz4740/irq.h:20:39: error: 'struct irq_data' declared inside parameter list will not be visible outside of this definition or declaration [-Werror]
include/linux/irqdesc.h:92:33: error: 'NR_IRQS' undeclared here (not in a function)
arch/mips/jz4740/irq.c:91:41: error: 'JZ4740_IRQ_BASE' undeclared (first use in this function)
arch/mips/jz4740/irq.c:68:6: error: conflicting types for 'jz4740_irq_resume'
arch/mips/jz4740/irq.c:62:6: error: conflicting types for 'jz4740_irq_suspend'
arch/mips/jz4740/irq.c:49:39: error: 'JZ4740_IRQ_BASE' undeclared (first use in this function)
arch/mips/jz4740/gpio.c:47:32: error: initializer element is not constant
arch/mips/jz4740/gpio.c:46:32: error: initializer element is not constant
arch/mips/jz4740/gpio.c:45:32: error: initializer element is not constant
arch/mips/jz4740/gpio.c:44:32: error: initializer element is not constant
arch/mips/jz4740/gpio.c:447:22: error: assignment from incompatible pointer type [-Werror=incompatible-pointer-types]
arch/mips/jz4740/gpio.c:446:23: error: assignment from incompatible pointer type [-Werror=incompatible-pointer-types]
arch/mips/jz4740/gpio.c:427:14: error: implicit declaration of function 'JZ4740_IRQ_INTC_GPIO' [-Werror=implicit-function-declaration]
arch/mips/jz4740/gpio.c:269:9: error: implicit declaration of function 'JZ4740_IRQ_GPIO' [-Werror=implicit-function-declaration]

The problem seems to be caused by commit 83bc76920080 ("MIPS: JZ4740: Use
generic irq chip") from linux-3.2, but only showed up in a defconfig
build when qi_lb60_defconfig was added in linux-3.13 and that configuration
never successfully built.

The code has changed in a number of ways before 4.4, which builds fine.
While I did not bisect the problem to a specific change, I found a simple
fix by including the obviously missing header.

Cc: Lars-Peter Clausen 
Signed-off-by: Arnd Bergmann 
Signed-off-by: Greg Kroah-Hartman

MIPS: KGDB: Use kernel context for sleeping threads

2017-05-08T05:44:09+00:00

commit 162b270c664dca2e0944308e92f9fcc887151a72 upstream.

KGDB is a kernel debug stub and it can't be used to debug userland as it
can only safely access kernel memory.

On MIPS however KGDB has always got the register state of sleeping
processes from the userland register context at the beginning of the
kernel stack. This is meaningless for kernel threads (which never enter
userland), and for user threads it prevents the user seeing what it is
doing while in the kernel:

(gdb) info threads
  Id   Target Id         Frame
  ...
  3    Thread 2 (kthreadd) 0x0000000000000000 in ?? ()
  2    Thread 1 (init)   0x000000007705c4b4 in ?? ()
  1    Thread -2 (shadowCPU0) 0xffffffff8012524c in arch_kgdb_breakpoint () at arch/mips/kernel/kgdb.c:201

Get the register state instead from the (partial) kernel register
context stored in the task's thread_struct for resume() to restore. All
threads now correctly appear to be in context_switch():

(gdb) info threads
  Id   Target Id         Frame
  ...
  3    Thread 2 (kthreadd) context_switch (rq=, cookie=..., next=, prev=0x0) at kernel/sched/core.c:2903
  2    Thread 1 (init)   context_switch (rq=, cookie=..., next=, prev=0x0) at kernel/sched/core.c:2903
  1    Thread -2 (shadowCPU0) 0xffffffff8012524c in arch_kgdb_breakpoint () at arch/mips/kernel/kgdb.c:201

Call clobbered registers which aren't saved and exception registers
(BadVAddr & Cause) which can't be easily determined without stack
unwinding are reported as 0. The PC is taken from the return address,
such that the state presented matches that found immediately after
returning from resume().

Fixes: 8854700115ec ("[MIPS] kgdb: add arch support for the kernel's kgdb core")
Signed-off-by: James Hogan 
Cc: Jason Wessel 
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/15829/
Signed-off-by: Ralf Baechle 
Signed-off-by: Greg Kroah-Hartman

MIPS: Fix crash registers on non-crashing CPUs

2017-05-08T05:44:08+00:00

commit c80e1b62ffca52e2d1d865ee58bc79c4c0c55005 upstream.

As part of handling a crash on an SMP system, an IPI is send to
all other CPUs to save their current registers and stop.  It was
using task_pt_regs(current) to get the registers, but that will
only be accurate if the CPU was interrupted running in userland.
Instead allow the architecture to pass in the registers (all
pass NULL now, but allow for the future) and then use get_irq_regs()
which should be accurate as we are in an interrupt.  Fall back to
task_pt_regs(current) if nothing else is available.

Signed-off-by: Corey Minyard 
Cc: David Daney 
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/13050/
Signed-off-by: Ralf Baechle 
Cc: Julia Lawall 
Signed-off-by: Greg Kroah-Hartman

MIPS: ralink: Cosmetic change to prom_init().

2017-04-30T03:49:17+00:00

commit 9c48568b3692f1a56cbf1935e4eea835e6b185b1 upstream.

Over the years the code has been changed various times leading to
argc/argv being defined in a different function to where we actually
use the variables. Clean this up by moving them to prom_init_cmdline().

Signed-off-by: John Crispin 
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14902/
Signed-off-by: Ralf Baechle 
Cc: Arnd Bergmann 
Signed-off-by: Greg Kroah-Hartman

MIPS: MSP71xx: remove odd locking in PCI config space access code

2017-04-30T03:49:16+00:00

commit c4a305374bbf36414515d2ae00d588c67051e67d upstream.

Caller (generic PCI code) already do proper locking so no need to add
another one here.

Signed-off-by: Sergey Ryazanov 
Cc: Linux MIPS 
Patchwork: https://patchwork.linux-mips.org/patch/7601/
Signed-off-by: Ralf Baechle 
Cc: Arnd Bergmann 
Signed-off-by: Greg Kroah-Hartman

MIPS: asm: compiler: Add new macros to set ISA and arch asm annotations

2017-04-30T03:49:15+00:00

commit be5136988e25ae0dc8379fcb937efc63d87aba9e upstream.

There are certain places where the code uses .set mips32 or .set mips64
or .set arch=r4000. In preparation of MIPS R6 support, and in order to
use as less #ifdefs as possible, we define new macros to set similar
annotations for MIPS R6.

Signed-off-by: Markos Chandras 
Cc: Arnd Bergmann 
Signed-off-by: Greg Kroah-Hartman

MIPS: Fix the build on jz4740 after removing the custom gpio.h

2017-04-30T03:49:14+00:00

commit 5b235dc2647e4977b17b5c41d959d0f455831c3f upstream.

Somehow the wrong version of the patch to remove the use of custom
gpio.h on mips has been merged. This patch add the missing fixes for a
build error on jz4740 because linux/gpio.h doesn't provide any machine
specfics definitions anymore.

Signed-off-by: Alban Bedel 
Cc: Paul Burton 
Cc: Lars-Peter Clausen 
Cc: Brian Norris 
Cc: Thomas Gleixner 
Cc: Linus Walleij 
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/11089/
Signed-off-by: Ralf Baechle 
Cc: Arnd Bergmann 
Signed-off-by: Greg Kroah-Hartman

mips/ptrace: Preserve previous registers for short regset write

2017-04-22T05:14:59+00:00

commit d614fd58a2834cfe4efa472c33c8f3ce2338b09b upstream.

Ensure that if userspace supplies insufficient data to PTRACE_SETREGSET
to fill all the registers, the thread's old registers are preserved.

Signed-off-by: Dave Martin 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman