Messages in this thread | | | From | Andrea Parri <> | Subject | [PATCH v2 0/2] riscv/spinlock,atomic: Miscellaneous fixes | Date | Fri, 9 Mar 2018 13:12:39 +0100 |
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Hi,
The series is a follow-up on the discussion in [1], which led to the discovery of a few issues in the current implementations of RISC-V locking and atomic operations.
In summary, this series proposes the following modifications:
1. Use lightweigth fences for acquire/release (locking, atomics)
2. Use the combination of .rl and full fences for fully-ordered atomics implemented with LR/SC pairs.
3. A few style changes (80-chars lines, alignment).
Applies on top of "next-smp_sl_ar".
Cheers, Andrea
Changes since v1 [2]: - correct implementation of atomic_{xchg,cmpxchg}_release().
[1] https://marc.info/?l=linux-kernel&m=151930201102853&w=2 [2] https://marc.info/?l=linux-kernel&m=152027423529883&w=2
Andrea Parri (2): riscv/spinlock: Strengthen implementations with fences riscv/atomic: Strengthen implementations with fences
arch/riscv/include/asm/atomic.h | 417 ++++++++++++++++++++++++-------------- arch/riscv/include/asm/cmpxchg.h | 391 ++++++++++++++++++++++++++++------- arch/riscv/include/asm/fence.h | 12 ++ arch/riscv/include/asm/spinlock.h | 29 +-- 4 files changed, 615 insertions(+), 234 deletions(-) create mode 100644 arch/riscv/include/asm/fence.h
-- 2.7.4
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