Eric Lee / smarc-fsl-linux-kernel

06 Feb, 2018

1 commit

  • e61938a92   locking: Introduce sync_core_before_usermode() ... Browse Code ยป

    Introduce an architecture function that ensures the current CPU
    issues a core serializing instruction before returning to usermode.

    This is needed for the membarrier "sync_core" command.

    Architectures defining the sync_core_before_usermode() static inline
    need to select ARCH_HAS_SYNC_CORE_BEFORE_USERMODE.

    Signed-off-by: Mathieu Desnoyers
    Acked-by: Thomas Gleixner
    Acked-by: Peter Zijlstra (Intel)
    Cc: Andrea Parri
    Cc: Andrew Hunter
    Cc: Andy Lutomirski
    Cc: Arnd Bergmann
    Cc: Avi Kivity
    Cc: Benjamin Herrenschmidt
    Cc: Boqun Feng
    Cc: Dave Watson
    Cc: David Sehr
    Cc: Greg Hackmann
    Cc: H. Peter Anvin
    Cc: Linus Torvalds
    Cc: Maged Michael
    Cc: Michael Ellerman
    Cc: Paul E. McKenney
    Cc: Paul Mackerras
    Cc: Russell King
    Cc: Will Deacon
    Cc: linux-api@vger.kernel.org
    Cc: linux-arch@vger.kernel.org
    Link: http://lkml.kernel.org/r/20180129202020.8515-7-mathieu.desnoyers@efficios.com
    Signed-off-by: Ingo Molnar

    Mathieu Desnoyers