Re: [PATCH v4 01/17] perf: Protect perf_guest_cbs with RCU

[PATCH v4 00/17] perf: KVM: Fix, optimize, and clean up callbacks · Sean Christopherson <seanjc@google.com> · 2021-11-11
[PATCH v4 01/17] perf: Protect perf_guest_cbs with RCU · Sean Christopherson <seanjc@google.com> · 2021-11-11
Re: [PATCH v4 01/17] perf: Protect perf_guest_cbs with RCU · Paolo Bonzini <pbonzini@redhat.com> · 2021-11-11
Re: [PATCH v4 01/17] perf: Protect perf_guest_cbs with RCU · Peter Zijlstra <peterz@infradead.org> · 2021-11-11
Re: [PATCH v4 01/17] perf: Protect perf_guest_cbs with RCU · Paolo Bonzini <pbonzini@redhat.com> · 2021-11-12
[PATCH v4 02/17] KVM: x86: Register perf callbacks after calling vendor's hardware_setup() · Sean Christopherson <seanjc@google.com> · 2021-11-11
[PATCH v4 04/17] perf: Stop pretending that perf can handle multiple guest callbacks · Sean Christopherson <seanjc@google.com> · 2021-11-11
[PATCH v4 03/17] KVM: x86: Register Processor Trace interrupt hook iff PT enabled in guest · Sean Christopherson <seanjc@google.com> · 2021-11-11
[PATCH v4 05/17] perf: Drop dead and useless guest "support" from arm, csky, nds32 and riscv · Sean Christopherson <seanjc@google.com> · 2021-11-11
[PATCH v4 06/17] perf/core: Rework guest callbacks to prepare for static_call support · Sean Christopherson <seanjc@google.com> · 2021-11-11
[PATCH v4 07/17] perf: Add wrappers for invoking guest callbacks · Sean Christopherson <seanjc@google.com> · 2021-11-11
[PATCH v4 08/17] perf: Force architectures to opt-in to guest callbacks · Sean Christopherson <seanjc@google.com> · 2021-11-11
[PATCH v4 09/17] perf/core: Use static_call to optimize perf_guest_info_callbacks · Sean Christopherson <seanjc@google.com> · 2021-11-11
Re: [PATCH v4 09/17] perf/core: Use static_call to optimize perf_guest_info_callbacks · Sean Christopherson <seanjc@google.com> · 2022-02-02
Re: [PATCH v4 09/17] perf/core: Use static_call to optimize perf_guest_info_callbacks · Sami Tolvanen <samitolvanen@google.com> · 2022-02-04
Re: [PATCH v4 09/17] perf/core: Use static_call to optimize perf_guest_info_callbacks · Peter Zijlstra <peterz@infradead.org> · 2022-02-06
Re: [PATCH v4 09/17] perf/core: Use static_call to optimize perf_guest_info_callbacks · Kees Cook <hidden> · 2022-02-06
Re: [PATCH v4 09/17] perf/core: Use static_call to optimize perf_guest_info_callbacks · Peter Zijlstra <peterz@infradead.org> · 2022-02-06
Re: [PATCH v4 09/17] perf/core: Use static_call to optimize perf_guest_info_callbacks · Kees Cook <hidden> · 2022-02-07
Re: [PATCH v4 09/17] perf/core: Use static_call to optimize perf_guest_info_callbacks · Will McVicker <hidden> · 2022-02-18
Re: [PATCH v4 09/17] perf/core: Use static_call to optimize perf_guest_info_callbacks · Sean Christopherson <seanjc@google.com> · 2022-08-24
Re: [PATCH v4 09/17] perf/core: Use static_call to optimize perf_guest_info_callbacks · Carlos Llamas <cmllamas@google.com> · 2026-03-09
Re: [PATCH v4 09/17] perf/core: Use static_call to optimize perf_guest_info_callbacks · Sami Tolvanen <samitolvanen@google.com> · 2026-03-09
Re: [PATCH v4 09/17] perf/core: Use static_call to optimize perf_guest_info_callbacks · Carlos Llamas <cmllamas@google.com> · 2026-03-10
[PATCH] static_call: use CFI-compliant return0 stubs · Carlos Llamas <cmllamas@google.com> · 2026-03-11
Re: [PATCH] static_call: use CFI-compliant return0 stubs · Peter Zijlstra <peterz@infradead.org> · 2026-03-11
Re: [PATCH] static_call: use CFI-compliant return0 stubs · Carlos Llamas <cmllamas@google.com> · 2026-03-12
Re: [PATCH] static_call: use CFI-compliant return0 stubs · "Ard Biesheuvel" <ardb@kernel.org> · 2026-03-12
Re: [PATCH] static_call: use CFI-compliant return0 stubs · Peter Zijlstra <peterz@infradead.org> · 2026-03-12
Re: [PATCH] static_call: use CFI-compliant return0 stubs · Carlos Llamas <cmllamas@google.com> · 2026-03-12
Re: [PATCH v4 09/17] perf/core: Use static_call to optimize perf_guest_info_callbacks · Carlos Llamas <cmllamas@google.com> · 2026-03-11
[PATCH v4 10/17] KVM: x86: Drop current_vcpu for kvm_running_vcpu + kvm_arch_vcpu variable · Sean Christopherson <seanjc@google.com> · 2021-11-11
[PATCH v4 11/17] KVM: x86: More precisely identify NMI from guest when handling PMI · Sean Christopherson <seanjc@google.com> · 2021-11-11
[PATCH v4 12/17] KVM: Move x86's perf guest info callbacks to generic KVM · Sean Christopherson <seanjc@google.com> · 2021-11-11
[PATCH v4 13/17] KVM: x86: Move Intel Processor Trace interrupt handler to vmx.c · Sean Christopherson <seanjc@google.com> · 2021-11-11
[PATCH v4 14/17] KVM: arm64: Convert to the generic perf callbacks · Sean Christopherson <seanjc@google.com> · 2021-11-11
[PATCH v4 15/17] KVM: arm64: Hide kvm_arm_pmu_available behind CONFIG_HW_PERF_EVENTS=y · Sean Christopherson <seanjc@google.com> · 2021-11-11
Re: [PATCH v4 15/17] KVM: arm64: Hide kvm_arm_pmu_available behind CONFIG_HW_PERF_EVENTS=y · Marc Zyngier <maz@kernel.org> · 2021-11-11
[PATCH v4 16/17] KVM: arm64: Drop perf.c and fold its tiny bits of code into arm.c · Sean Christopherson <seanjc@google.com> · 2021-11-11
Re: [PATCH v4 16/17] KVM: arm64: Drop perf.c and fold its tiny bits of code into arm.c · Marc Zyngier <maz@kernel.org> · 2021-11-11
[PATCH v4 17/17] perf: Drop guest callback (un)register stubs · Sean Christopherson <seanjc@google.com> · 2021-11-11
Re: [PATCH v4 00/17] perf: KVM: Fix, optimize, and clean up callbacks · Peter Zijlstra <peterz@infradead.org> · 2021-11-11

From: Paolo Bonzini <pbonzini@redhat.com>
Date: 2021-11-12 07:55:43
Also in: kvm, kvmarm, linux-perf-users, linux-riscv, lkml, xen-devel

On 11/11/21 11:47, Peter Zijlstra wrote:

quoted

This technically could be RCU_INIT_POINTER but it's not worth a respin.
There are dozens of other occurrences, and if somebody wanted they
could use Coccinelle to fix all of them.

I've been pushing the other way, trying to get rid of RCU_INIT_POINTER()
since rcu_assign_pointer(, NULL) actualy DTRT per __builtin_constant_p()
etc.

Oh, that's pretty cool to know, thanks!

Paolo

There's a very few sites where we use RCU_INIT_POINTER() with a !NULL
argument, and those are 'special'.


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