diff options
| author | Steve Capper <[email protected]> | 2015-03-22 14:51:51 +0000 |
|---|---|---|
| committer | Catalin Marinas <[email protected]> | 2015-03-24 18:02:55 +0000 |
| commit | f3eab7184ddcd4867cf42e3274ba24a66e1e093d (patch) | |
| tree | e501fee107f0d97b77cde072d14b0eeb80cd85af /lib/cpu-notifier-error-inject.c | |
| parent | e53f21bce4d35a93b23d8fa1a840860f6c74f59e (diff) | |
arm64: percpu: Make this_cpu accessors pre-empt safe
this_cpu operations were implemented for arm64 in:
5284e1b arm64: xchg: Implement cmpxchg_double
f97fc81 arm64: percpu: Implement this_cpu operations
Unfortunately, it is possible for pre-emption to take place between
address generation and data access. This can lead to cases where data
is being manipulated by this_cpu for a different CPU than it was
called on. Which effectively breaks the spec.
This patch disables pre-emption for the this_cpu operations
guaranteeing that address generation and data manipulation take place
without a pre-emption in-between.
Fixes: 5284e1b4bc8a ("arm64: xchg: Implement cmpxchg_double")
Fixes: f97fc810798c ("arm64: percpu: Implement this_cpu operations")
Reported-by: Mark Rutland <[email protected]>
Acked-by: Will Deacon <[email protected]>
Signed-off-by: Steve Capper <[email protected]>
[[email protected]: remove space after type cast]
Signed-off-by: Catalin Marinas <[email protected]>
Diffstat (limited to 'lib/cpu-notifier-error-inject.c')
0 files changed, 0 insertions, 0 deletions