diff options
| author | Nicholas Piggin <npiggin@gmail.com> | 2020-07-16 11:35:22 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-07-23 17:43:23 +1000 |
| commit | 2384b36f9156c3b815a5ce5f694edc5054ab7625 (patch) | |
| tree | 1c899ff71242c1660cdf826f87bd1136898fb1d8 /arch/powerpc/include/asm/exception-64e.h | |
| parent | 147c13413c04bc6a2bd76f2503402905e5e98cff (diff) | |
powerpc: Select ARCH_HAS_MEMBARRIER_SYNC_CORE
powerpc return from interrupt and return from system call sequences
are context synchronising.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200716013522.338318-1-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/include/asm/exception-64e.h')
| -rw-r--r-- | arch/powerpc/include/asm/exception-64e.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/exception-64e.h b/arch/powerpc/include/asm/exception-64e.h index 54a98ef7d7fe..72b6657acd2d 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 + * synchronisation instructions. + */ #define RFI_TO_KERNEL \ rfi |