Re: [PATCH v3 19/19] arm64: lto: Strengthen READ_ONCE() to acquire when CONFIG_LTO=y

On Fri 2020-07-10 17:52:03, Will Deacon wrote: > 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

[PATCH v3 19/19] 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