** Changed in: linux (Ubuntu Trusty)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Utopic)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
** Tags added: kernel-da-key trusty utopic
** Changed in: linux (Ubuntu Trusty)
Status: New => Triaged
** Changed in: linux (Ubuntu Utopic)
Status: New => Triaged
** Changed in: linux (Ubuntu)
Status: Confirmed => Triaged
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https://bugs.launchpad.net/bugs/1398596
Title:
[Revert] arm64: optimized copy_to_user and copy_from_user assembly
code
Status in linux package in Ubuntu:
Triaged
Status in linux source package in Trusty:
Triaged
Status in linux source package in Utopic:
Triaged
Bug description:
[Impact]
Fixes an issue where the kernel hits unhandled pagefaults when copy_to_user
is called.
http://www.spinics.net/lists/arm-kernel/msg381811.html
[Test Case]
Put the system under memory pressure.
[Regression Potential]
It will cause a performance regression on certain workloads on arm64 systems.
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