[PATCH] powerpc/security: Use a mutex for interrupt exit code patching

[Michael Ellerman]

On Wed, 27 Oct 2021 17:24:10 +1000, Russell Currey wrote:
> The mitigation-patching.sh script in the powerpc selftests toggles
> all mitigations on and off simultaneously, revealing that rfi_flush
> and stf_barrier cannot safely operate at the same time due to races
> in updating the static key.
> 
> On some systems, the static key code throws a warning and the kernel
> remains functional.  On others, the kernel will hang or crash.
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc/security: Use a mutex for interrupt exit code patching
      https://git.kernel.org/powerpc/c/3c12b4df8d5e026345a19886ae375b3ebc33c0b6

cheers