linux.git/arch/xtensa, branch v3.12-rc2

Merge tag 'xtensa-next-20130912' of git://github.com/czankel/xtensa-linux

2013-09-13T17:57:48+00:00

Pull Xtensa updates from Chris Zankel.

* tag 'xtensa-next-20130912' of git://github.com/czankel/xtensa-linux:
  xtensa: Fix broken allmodconfig build
  xtensa: remove CCOUNT_PER_JIFFY
  xtensa: fix !CONFIG_XTENSA_CALIBRATE_CCOUNT build failure
  xtensa: don't use echo -e needlessly
  xtensa: new fast_alloca handler
  xtensa: keep a3 and excsave1 on entry to exception handlers
  xtensa: enable kernel preemption
  xtensa: check thread flags atomically on return from user exception

Remove GENERIC_HARDIRQ config option

2013-09-13T13:09:52+00:00

After the last architecture switched to generic hard irqs the config
options HAVE_GENERIC_HARDIRQS & GENERIC_HARDIRQS and the related code
for !CONFIG_GENERIC_HARDIRQS can be removed.

Signed-off-by: Martin Schwidefsky

arch: mm: pass userspace fault flag to generic fault handler

2013-09-12T22:38:01+00:00

Unlike global OOM handling, memory cgroup code will invoke the OOM killer
in any OOM situation because it has no way of telling faults occuring in
kernel context - which could be handled more gracefully - from
user-triggered faults.

Pass a flag that identifies faults originating in user space from the
architecture-specific fault handlers to generic code so that memcg OOM
handling can be improved.

Signed-off-by: Johannes Weiner 
Reviewed-by: Michal Hocko 
Cc: David Rientjes 
Cc: KAMEZAWA Hiroyuki 
Cc: azurIt 
Cc: KOSAKI Motohiro 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

xtensa: Fix broken allmodconfig build

2013-09-06T16:50:56+00:00

xtansa allmodbuild fails with:

arch/xtensa/kernel/xtensa_ksyms.c:129:1: error: '_mcount' undeclared here (not in a function)
make[2]: *** [arch/xtensa/kernel/xtensa_ksyms.o] Error 1
make[1]: *** [arch/xtensa/kernel] Error 2

The breakage is due to commit 478ba61af (xtensa: add static function tracer
support) which exports _mcount without declaring it.

Cc: Max Filippov 
Signed-off-by: Guenter Roeck 
Signed-off-by: Chris Zankel

xtensa: remove CCOUNT_PER_JIFFY

2013-09-06T16:48:59+00:00

Use ccount_freq directly to make the code a little more readable.

Signed-off-by: Baruch Siach 
Signed-off-by: Max Filippov 
Signed-off-by: Chris Zankel

xtensa: fix !CONFIG_XTENSA_CALIBRATE_CCOUNT build failure

2013-09-06T16:48:51+00:00

Commits 925f5532 (xtensa: ccount based clockevent implementation) and e3f43291
(xtensa: ccount based sched_clock) introduced users of ccount_freq. This
variable doesn't exist when CONFIG_XTENSA_CALIBRATE_CCOUNT is disabled. Add
ccount_freq definition in this case.

Reported-by: Chen Gang 
Signed-off-by: Baruch Siach 
Signed-off-by: Max Filippov 
Signed-off-by: Chris Zankel

xtensa: don't use echo -e needlessly

2013-09-06T16:48:29+00:00

-e is not needed to output strings without escape sequences. This breaks
big endian FSF build when the shell is dash, because its builtin echo
doesn't understand '-e' switch and outputs it in the echoed string.

Reported-by: Guenter Roeck 
Signed-off-by: Max Filippov 
Signed-off-by: Chris Zankel

xtensa: new fast_alloca handler

2013-09-06T16:48:12+00:00

Instead of emulating movsp instruction in the kernel use window
underflow handler to load missing register window and retry failed
movsp.

Signed-off-by: Max Filippov 
Signed-off-by: Chris Zankel

xtensa: keep a3 and excsave1 on entry to exception handlers

2013-09-06T16:47:41+00:00

Based on the SMP patch by Joe Taylor and subsequent fixes.
Preserve exception table pointer (normally stored in excsave1 SR) as it
cannot be easily restored in SMP environment.

Signed-off-by: Max Filippov 
Signed-off-by: Chris Zankel

xtensa: enable kernel preemption

2013-09-06T16:46:49+00:00

Signed-off-by: Max Filippov 
Signed-off-by: Chris Zankel