linux-stable.git/arch/arc/kernel, branch v3.12.39

ARC: Fix KSTK_ESP()

2015-03-12T16:31:20+00:00

commit 13648b0118a24f4fc76c34e6c7b6ccf447e46a2a upstream.

/proc//maps currently don't annotate stack vma with "[stack]"
This is because KSTK_ESP ie expected to return usermode SP of tsk while
currently it returns the kernel mode SP of a sleeping tsk.

While the fix is trivial, we also need to adjust the ARC kernel stack
unwinder to not use KSTK_SP and friends any more.

Reported-and-suggested-by: Alexey Brodkin 
Signed-off-by: Vineet Gupta 
Signed-off-by: Jiri Slaby

ARC: Disable caches in early boot if so configured

2014-11-14T12:14:28+00:00

Requested-by: Noam Camus 
Signed-off-by: Vineet Gupta 
Signed-off-by: Jiri Slaby

ARC: [SMP] General Fixes

2014-11-13T18:02:30+00:00

commit c3441edd2dea83923421fd6050d2ffdc57696323 upstream.

-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

Signed-off-by: Jiri Slaby

ARC: Implement ptrace(PTRACE_GET_THREAD_AREA)

2014-07-29T15:01:49+00:00

commit a4b6cb735b25aa84a462a1985e3e43bebaf5beb4 upstream.

This patch adds implementation of GET_THREAD_AREA ptrace request type. This
is required by GDB to debug NPTL applications.

Signed-off-by: Anton Kolesov 
Signed-off-by: Vineet Gupta 
Signed-off-by: Jiri Slaby

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

2014-05-15T07:55:56+00:00

commit 8aa9e85adac609588eeec356e5a85059b3b819ba upstream.

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: Anton Kolesov 
Cc: Francois Bedard 
Signed-off-by: Linus Torvalds 
Signed-off-by: Jiri Slaby

ARC: Ignore ptrace SETREGSET request for synthetic register "stop_pc"

2013-10-12T06:30:36+00:00

ARCompact TRAP_S insn used for breakpoints, commits before exception is
taken (updating architectural PC). So ptregs->ret contains next-PC and
not the breakpoint PC itself. This is different from other restartable
exceptions such as TLB Miss where ptregs->ret has exact faulting PC.
gdb needs to know exact-PC hence ARC ptrace GETREGSET provides for
@stop_pc which returns ptregs->ret vs. EFA depending on the
situation.

However, writing stop_pc (SETREGSET request), which updates ptregs->ret
doesn't makes sense stop_pc doesn't always correspond to that reg as
described above.

This was not an issue so far since user_regs->ret / user_regs->stop_pc
had same value and both writing to ptregs->ret was OK, needless, but NOT
broken, hence not observed.

With gdb "jump", they diverge, and user_regs->ret updating ptregs is
overwritten immediately with stop_pc, which this patch fixes.

Reported-by: Anton Kolesov 
Signed-off-by: Vineet Gupta

ARC: Fix signal frame management for SA_SIGINFO

2013-10-03T04:13:56+00:00

Previously, when a signal was registered with SA_SIGINFO, parameters 2
and 3 of the signal handler were written to registers r1 and r2 before
the register set was saved. This led to corruption of these two
registers after returning from the signal handler (the wrong values were
restored).
With this patch, registers are now saved before any parameters are
passed, thus maintaining the processor state from before signal entry.

Signed-off-by: Christian Ruppert 
Signed-off-by: Vineet Gupta

ARC: Use clockevents_config_and_register over clockevents_register_device

2013-09-27T10:58:48+00:00

clockevents_config_and_register is more clever and correct than doing it
by hand; so use it.

[vgupta: fixed build failure due to missing ; in patch]

Signed-off-by: Uwe Kleine-König 
Signed-off-by: Vineet Gupta

ARC: Handle zero-overhead-loop in unaligned access handler

2013-09-27T10:58:23+00:00

If a load or store is the last instruction in a zero-overhead-loop, and
it's misaligned, the loop would execute only once.

This fixes that problem.

Signed-off-by: Mischa Jonker 
Signed-off-by: Vineet Gupta

ARC: SMP failed to boot due to missing IVT setup

2013-09-12T14:40:08+00:00

Commit 05b016ecf5e7a "ARC: Setup Vector Table Base in early boot" moved
the Interrupt vector Table setup out of arc_init_IRQ() which is called
for all CPUs, to entry point of boot cpu only, breaking booting of others.

Fix by adding the same to entry point of non-boot CPUs too.

read_arc_build_cfg_regs() printing IVT Base Register didn't help the
casue since it prints a synthetic value if zero which is totally bogus,
so fix that to print the exact Register.

[vgupta: Remove the now stale comment from header of arc_init_IRQ and
also added the commentary for halt-on-reset]

Cc: Gilad Ben-Yossef 
Cc: Cc:  #3.11
Signed-off-by: Noam Camus 
Signed-off-by: Vineet Gupta 
Signed-off-by: Linus Torvalds