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RISC-V: Upgrade smp_mb__after_spinlock() to iorw,iorw
authorPalmer Dabbelt <palmerdabbelt@google.com>
Thu, 16 Jul 2020 18:57:26 +0000 (11:57 -0700)
committerPalmer Dabbelt <palmerdabbelt@google.com>
Fri, 17 Jul 2020 16:28:35 +0000 (09:28 -0700)
commit53743b5d0dfb56a2cf1a0d78ad64de596d9f859e
tree95be1d51d69478dbf93f5bb8c2a4e6c7729d21f9tree | snapshot
parenteba5ff90f95c59c934ac3a0eb5040ec9d613b8dbcommit | diff
RISC-V: Upgrade smp_mb__after_spinlock() to iorw,iorw

While digging through the recent mmiowb preemption issue it came up that
we aren't actually preventing IO from crossing a scheduling boundary.
While it's a bit ugly to overload smp_mb__after_spinlock() with this
behavior, it's what PowerPC is doing so there's some precedent.

Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
arch/riscv/include/asm/barrier.h diff | blob | history
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