[arm/Linux] Don't rely on KUSER_HELPERS feature

[arm/Linux] Don't rely on KUSER_HELPERS feature

ARM specific CONFIG_KUSER_HELPERS kernel feature for Linux can be disabled,
and in this case, we shouldn't crash. Use a __sync_synchronize() call
instead for Linux platforms.

BUG=599051
Committed: https://crrev.com/d65c3c2511404c3c5a5a5f304eb3b83ac5194e7a
Cr-Commit-Position: refs/heads/master@{#383967}

[jbriance, 2016-03-30 12:26:08]

Description was changed from

==========
[arm/Linux] Don't rely on KUSER_HELPERS feature

ARM specific CONFIG_KUSER_HELPERS kernel feature for Linux can be disabled,
and in this case, we shouldn't crash. Use a __sync_synchronize() call
instead for Linux platforms.

BUG=599051
==========

to

==========
[arm/Linux] Don't rely on KUSER_HELPERS feature

ARM specific CONFIG_KUSER_HELPERS kernel feature for Linux can be disabled,
and in this case, we shouldn't crash. Use a __sync_synchronize() call
instead for Linux platforms.

BUG=599051
==========

[jbriance, 2016-03-30 12:26:08]

jbriance@cisco.com changed reviewers:
+ abarth@chromium.org, dvyukov@chromium.org, haraken@chromium.org,
vegorov@chromium.org

[haraken, 2016-03-30 12:27:54]

LGTM

[jbriance, 2016-03-30 12:32:54]

The CQ bit was checked by jbriance@cisco.com

[commit-bot: I haz the power, 2016-03-30 12:33:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1842003002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1842003002/1

[commit-bot: I haz the power, 2016-03-30 13:42:21]

Description was changed from

==========
[arm/Linux] Don't rely on KUSER_HELPERS feature

ARM specific CONFIG_KUSER_HELPERS kernel feature for Linux can be disabled,
and in this case, we shouldn't crash. Use a __sync_synchronize() call
instead for Linux platforms.

BUG=599051
==========

to

==========
[arm/Linux] Don't rely on KUSER_HELPERS feature

ARM specific CONFIG_KUSER_HELPERS kernel feature for Linux can be disabled,
and in this case, we shouldn't crash. Use a __sync_synchronize() call
instead for Linux platforms.

BUG=599051
==========

[commit-bot: I haz the power, 2016-03-30 13:42:22]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-30 13:44:34]

Description was changed from

==========
[arm/Linux] Don't rely on KUSER_HELPERS feature

ARM specific CONFIG_KUSER_HELPERS kernel feature for Linux can be disabled,
and in this case, we shouldn't crash. Use a __sync_synchronize() call
instead for Linux platforms.

BUG=599051
==========

to

==========
[arm/Linux] Don't rely on KUSER_HELPERS feature

ARM specific CONFIG_KUSER_HELPERS kernel feature for Linux can be disabled,
and in this case, we shouldn't crash. Use a __sync_synchronize() call
instead for Linux platforms.

BUG=599051

Committed: https://crrev.com/d65c3c2511404c3c5a5a5f304eb3b83ac5194e7a
Cr-Commit-Position: refs/heads/master@{#383967}
==========

[commit-bot: I haz the power, 2016-03-30 13:44:35]

Patchset 1 (id:??) landed as
https://crrev.com/d65c3c2511404c3c5a5a5f304eb3b83ac5194e7a
Cr-Commit-Position: refs/heads/master@{#383967}