linux-toradex.git/arch/xtensa, branch v3.12.20 Linux kernel for Apalis and Colibri modules xtensa: introduce spill_registers_kernel macro 2014-03-05T16:13:53+00:00 Max Filippov jcmvbkbc@gmail.com 2014-01-22T04:04:43+00:00 d33ee5e7f8c3de1a6f407e3568ece84ec51db042 commit e2fd1374c705abe4661df3fb6fadb3879c7c1846 upstream. Most in-kernel users want registers spilled on the kernel stack and don't require PS.EXCM to be set. That means that they don't need fixup routine and could reuse regular window overflow mechanism for that, which makes spill routine very simple. Suggested-by: Chris Zankel <chris@zankel.net> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Jiri Slaby <jslaby@suse.cz> 
commit e2fd1374c705abe4661df3fb6fadb3879c7c1846 upstream.

Most in-kernel users want registers spilled on the kernel stack and
don't require PS.EXCM to be set. That means that they don't need fixup
routine and could reuse regular window overflow mechanism for that,
which makes spill routine very simple.

Suggested-by: Chris Zankel <chris@zankel.net>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
xtensa: save current register frame in fast_syscall_spill_registers_fixup 2014-03-05T16:13:52+00:00 Max Filippov jcmvbkbc@gmail.com 2013-10-30T12:18:25+00:00 38848e0b02a239b01e5d974a84b8a6b85bcaf48a commit 3251f1e27a5a17f0efd436cfd1e7b9896cfab0a0 upstream. We need it saved because it contains a3 where we track which register windows we still need to spill, and fixup handler may call C exception handlers. Also fix comments. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Jiri Slaby <jslaby@suse.cz> 
commit 3251f1e27a5a17f0efd436cfd1e7b9896cfab0a0 upstream.

We need it saved because it contains a3 where we track which register
windows we still need to spill, and fixup handler may call C exception
handlers. Also fix comments.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
xtensa: xtfpga: fix definitions of platform devices 2014-02-13T21:50:14+00:00 Max Filippov jcmvbkbc@gmail.com 2013-12-25T01:20:36+00:00 452dc5f39bfc2b506f656e213828808316cadf0f commit a558d99263936b8a67d4eff8918745a77bfd8c31 upstream. Remove __initdata attribute, as the devices may be used after init sections are freed. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit a558d99263936b8a67d4eff8918745a77bfd8c31 upstream.

Remove __initdata attribute, as the devices may be used after init
sections are freed.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
xtensa: Cocci spatch "noderef" 2013-10-16T18:48:31+00:00 Thomas Meyer thomas@m3y3r.de 2013-09-19T21:42:22+00:00 f447fd30afdbb40c913054edaacf1a32df7a55d7 sizeof when applied to a pointer typed expression gives the size of the pointer. Found by coccinelle spatch "misc/noderef.cocci" Signed-off-by: Thomas Meyer <thomas@m3y3r.de> Signed-off-by: Chris Zankel <chris@zankel.net> 
sizeof when applied to a pointer typed expression gives the size of the
pointer.
Found by coccinelle spatch "misc/noderef.cocci"

Signed-off-by: Thomas Meyer <thomas@m3y3r.de>
Signed-off-by: Chris Zankel <chris@zankel.net>
xtensa: don't use alternate signal stack on threads 2013-10-15T20:39:16+00:00 Baruch Siach baruch@tkos.co.il 2013-10-14T22:22:43+00:00 cba9a90053e3b7973eff4f1946f33032e98eeed5 According to create_thread(3): "The new thread does not inherit the creating thread's alternate signal stack". Since commit f9a3879a (Fix sigaltstack corruption among cloned threads), current->sas_ss_size is set to 0 for cloned processes sharing VM with their parent. Don't use the (nonexistent) alternate signal stack in this case. This has been broken since commit 29c4dfd9 ([XTENSA] Remove non-rt signal handling). Fixes the SA_ONSTACK part of the nptl/tst-cancel20 test from uClibc. Cc: <stable@vger.kernel.org> Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net> 
According to create_thread(3): "The new thread does not inherit the creating
thread's alternate signal stack". Since commit f9a3879a (Fix sigaltstack
corruption among cloned threads), current->sas_ss_size is set to 0 for cloned
processes sharing VM with their parent. Don't use the (nonexistent) alternate
signal stack in this case. This has been broken since commit 29c4dfd9 ([XTENSA]
Remove non-rt signal handling).

Fixes the SA_ONSTACK part of the nptl/tst-cancel20 test from uClibc.

Cc: <stable@vger.kernel.org>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Chris Zankel <chris@zankel.net>
xtensa: fix fast_syscall_spill_registers_fixup 2013-10-15T20:39:06+00:00 Max Filippov jcmvbkbc@gmail.com 2013-10-14T22:22:42+00:00 244066f4be8ce2dc2d2d60f01bceeba55c71a783 fast_syscall_spill_registers_fixup was not correctly updated by the 'keep a3 and excsave1 on entry to exception handlers' patch: it doesn't preserve a3 that it gets on entry, breaking _spill_registers in case of page fault on stack during register spilling, leading to unhandled exception in kernel mode. Preserve a3 by saving it in the original _spill_registers stack frame's a3 during exception handling and restoring it afterwards. Also fix comments and function bounds annotations. Reported-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Tested-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Chris Zankel <chris@zankel.net> 
fast_syscall_spill_registers_fixup was not correctly updated by the
'keep a3 and excsave1 on entry to exception handlers' patch: it doesn't
preserve a3 that it gets on entry, breaking _spill_registers in case of
page fault on stack during register spilling, leading to unhandled
exception in kernel mode.

Preserve a3 by saving it in the original _spill_registers stack frame's
a3 during exception handling and restoring it afterwards.

Also fix comments and function bounds annotations.

Reported-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Tested-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Chris Zankel <chris@zankel.net>
Merge tag 'xtensa-next-20130912' of git://github.com/czankel/xtensa-linux 2013-09-13T17:57:48+00:00 Linus Torvalds torvalds@linux-foundation.org 2013-09-13T17:57:48+00:00 67002151403350b497c1efc8d36450974dfca023 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 
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 Martin Schwidefsky schwidefsky@de.ibm.com 2013-08-30T07:39:53+00:00 0244ad004a54e39308d495fee0a2e637f8b5c317 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 <schwidefsky@de.ibm.com> 
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 <schwidefsky@de.ibm.com>
arch: mm: pass userspace fault flag to generic fault handler 2013-09-12T22:38:01+00:00 Johannes Weiner hannes@cmpxchg.org 2013-09-12T22:13:39+00:00 759496ba6407c6994d6a5ce3a5e74937d7816208 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 <hannes@cmpxchg.org> Reviewed-by: Michal Hocko <mhocko@suse.cz> Cc: David Rientjes <rientjes@google.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: azurIt <azurit@pobox.sk> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> 
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 <hannes@cmpxchg.org>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Cc: David Rientjes <rientjes@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: azurIt <azurit@pobox.sk>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
xtensa: Fix broken allmodconfig build 2013-09-06T16:50:56+00:00 Guenter Roeck linux@roeck-us.net 2013-08-28T04:06:37+00:00 8872366df396444d7655287c79ed182d8f47cba6 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 <jcmvbkbc@gmail.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Chris Zankel <chris@zankel.net> 
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 <jcmvbkbc@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Chris Zankel <chris@zankel.net>