Re: [PATCH v7 08/14] KVM: Rename mmu_notifier_*
From: Peter Zijlstra <peterz@infradead.org>
Date: 2023-05-25 08:55:16
Also in:
kvm, linux-doc, linux-fsdevel, linux-kselftest, linux-mm, lkml, qemu-devel
On Wed, May 24, 2023 at 02:39:50PM -0700, Sean Christopherson wrote:
On Wed, May 24, 2023, Peter Zijlstra wrote:quoted
On Wed, May 24, 2023 at 01:16:03PM -0700, Sean Christopherson wrote:quoted
Of course, the only accesses outside of mmu_lock are reads, so on x86 that "atomic" access is just a READ_ONCE() load, but that's not the case for all architectures.This is true on *all* archs. atomic_set() and atomic_read() are no more and no less than WRITE_ONCE() / READ_ONCE().Ah, I take it s390's handcoded assembly routines are just a paranoid equivalents and not truly special? "l" and "st" do sound quite generic...
Yep, compiler *should* generate the same with READ_ONCE/WRITE_ONCE.