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| author |   Will Deacon <will@kernel.org> | 2020-06-30 14:02:48 +0100 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2020-11-09 21:49:34 +0000 |
| commit | e35123d83ee35c31f64ecfbdfabbe5142d3025b8 (patch) | |
| tree | 42cd6bf50f912bbeb4ba2cf8bbe32d98d89ba2c5 /Documentation/arm64 | |
| parent | arm64: alternatives: Remove READ_ONCE() usage during patch operation (diff) | |
| download | linux-dev-e35123d83ee35c31f64ecfbdfabbe5142d3025b8.tar.xz linux-dev-e35123d83ee35c31f64ecfbdfabbe5142d3025b8.zip | |
arm64: lto: Strengthen READ_ONCE() to acquire when CONFIG_LTO=y
When building with LTO, there is an increased risk of the compiler
converting an address dependency headed by a READ_ONCE() invocation
into a control dependency and consequently allowing for harmful
reordering by the CPU.
Ensure that such transformations are harmless by overriding the generic
READ_ONCE() definition with one that provides acquire semantics when
building with LTO.
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'Documentation/arm64')
0 files changed, 0 insertions, 0 deletions