On Jul 15 2020, Nicholas Piggin wrote: > diff --git a/arch/powerpc/include/asm/exception-64e.h b/arch/powerpc/include/asm/exception-64e.h > index 54a98ef7d7fe..071d7ccb830f 100644 > --- a/arch/powerpc/include/asm/exception-64e.h > +++ b/arch/powerpc/include/asm/exception-64e.h > @@ -204,7 +204,11 @@ exc_##label##_book3e: > LOAD_REG_ADDR(r3,interrupt_base_book3e);\ > ori r3,r3,vector_offset@l; \ > mtspr SPRN_IVOR##vector_number,r3; > - > +/* > + * powerpc relies on return from interrupt/syscall being context synchronising > + * (which rfi is) to support ARCH_HAS_MEMBARRIER_SYNC_CORE without additional > + * additional synchronisation instructions. s/additonal// Andreas. -- Andreas Schwab, schwab@xxxxxxxxxxxxxx GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1 "And now for something completely different."
