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| 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/kernel/entry_32.S | |
| parent | 147c13413c04bc6a2bd76f2503402905e5e98cff (diff) | |
| download | lwn-2384b36f9156c3b815a5ce5f694edc5054ab7625.tar.gz lwn-2384b36f9156c3b815a5ce5f694edc5054ab7625.zip | |
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/kernel/entry_32.S')
| -rw-r--r-- | arch/powerpc/kernel/entry_32.S | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S index 217ebdf5b00b..f4d0af8e1136 100644 --- a/arch/powerpc/kernel/entry_32.S +++ b/arch/powerpc/kernel/entry_32.S @@ -36,6 +36,12 @@ #include "head_32.h" /* + * powerpc relies on return from interrupt/syscall being context synchronising + * (which rfi is) to support ARCH_HAS_MEMBARRIER_SYNC_CORE without additional + * synchronisation instructions. + */ + +/* * Align to 4k in order to ensure that all functions modyfing srr0/srr1 * fit into one page in order to not encounter a TLB miss between the * modification of srr0/srr1 and the associated rfi. |