Re: [PATCH v2] powerpc: select ARCH_HAS_MEMBARRIER_SYNC_CORE
From: Andreas Schwab <hidden>
Date: 2020-07-15 10:19:44
Also in:
linux-arch
On Jul 15 2020, Nicholas Piggin wrote:
quoted hunk ↗ jump to hunk
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@linux-m68k.org GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1 "And now for something completely different."