https://github.com/torvalds/linux
Revision f3eab7184ddcd4867cf42e3274ba24a66e1e093d authored by Steve Capper on 22 March 2015, 14:51:51 UTC, committed by Catalin Marinas on 24 March 2015, 18:02:55 UTC
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 <mark.rutland@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Steve Capper <steve.capper@linaro.org>
[catalin.marinas@arm.com: remove space after type cast]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
1 parent e53f21b
Tip revision: f3eab7184ddcd4867cf42e3274ba24a66e1e093d authored by Steve Capper on 22 March 2015, 14:51:51 UTC
arm64: percpu: Make this_cpu accessors pre-empt safe
arm64: percpu: Make this_cpu accessors pre-empt safe
Tip revision: f3eab71
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| .gitignore | -rw-r--r-- | 1.2 KB |
| .mailmap | -rw-r--r-- | 4.9 KB |
| COPYING | -rw-r--r-- | 18.3 KB |
| CREDITS | -rw-r--r-- | 94.0 KB |
| Kbuild | -rw-r--r-- | 2.1 KB |
| Kconfig | -rw-r--r-- | 252 bytes |
| MAINTAINERS | -rw-r--r-- | 298.8 KB |
| Makefile | -rw-r--r-- | 53.3 KB |
| README | -rw-r--r-- | 18.3 KB |
| REPORTING-BUGS | -rw-r--r-- | 7.3 KB |
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