linux.git/arch/arc/kernel, branch v3.15

ARC: !PREEMPT: Ensure Return to kernel mode is IRQ safe

2014-04-30T15:21:43+00:00

There was a very small race window where resume to kernel mode from a
Exception Path (or pure kernel mode which is true for most of ARC
exceptions anyways), was not disabling interrupts in restore_regs,
clobbering the exception regs

Anton found the culprit call flow (after many sleepless nights)

| 1. we got a Trap from user land
| 2. started to service it.
| 3. While doing some stuff on user-land memory (I think it is padzero()),
|     we got a DataTlbMiss
| 4. On return from it we are taking "resume_kernel_mode" path
| 5. NEED_RESHED is not set, so we go to "return from exception" path in
|     restore regs.
| 6. there seems to be IRQ happening

Signed-off-by: Vineet Gupta 
Cc:    #3.10, 3.12, 3.13, 3.14
Cc: Anton Kolesov 
Cc: Francois Bedard 
Signed-off-by: Linus Torvalds

ARC: [SMP] General Fixes

2014-04-05T09:16:42+00:00

-Pass the expected arg to non-boot park'ing routine
 (It worked so far because existing SMP backends don't use the arg)

-CONFIG_DEBUG_PREEMPT warning

ARC: [clockevent] simplify timer ISR

2014-03-26T09:01:30+00:00

* Remove one liner IRQ ACK accessor, it was coming in the way of readability.

Signed-off-by: Vineet Gupta

ARC: [clockevent] can't be SoC specific

2014-03-26T09:01:29+00:00

So no point keeping it weak

Signed-off-by: Vineet Gupta

ARC: switch to generic ENTRY/END assembler annotations

2014-03-26T09:01:28+00:00

With commit 9df62f054406 "arch: use ASM_NL instead of ';'" the generic
macros can handle the arch specific newline quirk. Hence we can get rid
of ARC asm macros and use the "C" style macros.

Signed-off-by: Vineet Gupta

ARC: [cmdline] support External Device Trees from u-boot

2014-01-16T13:23:16+00:00

Signed-off-by: Vineet Gupta

ARC: [cmdline] uboot cmdline handling rework

2014-01-16T13:19:38+00:00

* Moved cmdline copy from asm to "C" - allows for more robust checking
  of pointer validity etc.

* Remove the Kconfig option to do so, base it on a runtime value passed
  by u-boot

Signed-off-by: Vineet Gupta

ARC: [SMP] optimize IPI send and receive

2013-12-23T06:35:04+00:00

* Don't send an IPI if receiver already has a pending IPI.
  Atomically piggyback the new msg with pending msg.

* IPI receiver looping on xchg() not required

References: https://lkml.org/lkml/2013/11/25/232
Suggested-by: Peter Zijlstra 
Signed-off-by: Vineet Gupta

ARC: [SMP] simplify IPI code

2013-12-23T06:35:04+00:00

* ipi_data is just a word, no need to keep it as struct

* find_next_bit() not needed to loop thru a 32bit word, ffs suffices

ARC: [SMP] cpu halt interface doesn't need "self" cpu-id

2013-12-23T06:35:04+00:00

Signed-off-by: Vineet Gupta