[PATCH v4 3/4] locking/qspinlock: Add ARCH_USE_QUEUED_SPINLOCKS_XCHG32

Peter Zijlstra peterz at infradead.org
Wed Apr 7 16:51:07 BST 2021


On Wed, Apr 07, 2021 at 04:29:12PM +0200, Christoph Müllner wrote:
> Further, it is not the case that RISC-V has no guarantees at all.
> It just does not provide a forward progress guarantee for a
> synchronization implementation,
> that writes in an endless loop to a memory location while trying to
> complete an LL/SC
> loop on the same memory location at the same time.

Userspace can DoS the kernel that way, see futex.



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