From: "Nicholas Piggin" <npiggin@gmail•com>
To: "Rohan McLure" <rmclure@linux•ibm.com>
Cc: linuxppc-dev <linuxppc-dev@lists•ozlabs.org>, arnd@arndb•de
Subject: Re: [PATCH 03/12] powerpc: qspinlock: Enforce qnode writes prior to publishing to queue
Date: Tue, 09 May 2023 16:45:22 +1000 [thread overview]
Message-ID: <CSHJLY451TDZ.RF0HOE2T64GT@wheely> (raw)
In-Reply-To: <46600B7B-1E59-4B82-82DF-27D3B0473EEF@linux.ibm.com>
On Tue May 9, 2023 at 3:26 PM AEST, Rohan McLure wrote:
> > On 9 May 2023, at 12:04 pm, Nicholas Piggin <npiggin@gmail•com> wrote:
> >
> > On Mon May 8, 2023 at 12:01 PM AEST, Rohan McLure wrote:
> >> Use a compiler barrier to enforce that all fields of a new struct qnode
> >> be written to (especially the lock value) before publishing the qnode to
> >> the waitqueue.
> >
> > publish_tail_cpu is the release barrier for this and includes the memory
> > clobber there. Can we annotate that instead?
>
> Got it, I see that one now.
>
> On another note though, it looks like the memory clobber doesn’t serve
> to squash KCSAN warnings here.
Aha, publish_tail_cpu() needs a kcsan_release().
Thanks,
Nick
next prev parent reply other threads:[~2023-05-09 6:46 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-08 2:01 [PATCH 00/12] powerpc: KCSAN fix warnings and mark accesses Rohan McLure
2023-05-08 2:01 ` [PATCH 01/12] powerpc: qspinlock: Fix qnode->locked value interpretation Rohan McLure
2023-05-09 2:01 ` Nicholas Piggin
2023-05-09 4:26 ` Rohan McLure
2023-05-08 2:01 ` [PATCH 02/12] powerpc: qspinlock: Mark accesses to qnode lock checks Rohan McLure
2023-05-09 2:02 ` Nicholas Piggin
2023-05-08 2:01 ` [PATCH 03/12] powerpc: qspinlock: Enforce qnode writes prior to publishing to queue Rohan McLure
2023-05-09 2:04 ` Nicholas Piggin
2023-05-09 5:26 ` Rohan McLure
2023-05-09 6:45 ` Nicholas Piggin [this message]
2023-05-08 2:01 ` [PATCH 04/12] asm-generic/mmiowb: Mark accesses to fix KCSAN warnings Rohan McLure
2023-05-08 6:30 ` Arnd Bergmann
2023-05-08 15:44 ` [PATCH 4/12] " Gautam Menghani
2023-05-09 2:16 ` [PATCH 04/12] " Nicholas Piggin
2023-05-08 2:01 ` [PATCH 05/12] powerpc: Mark [h]ssr_valid accesses in check_return_regs_valid Rohan McLure
2023-05-09 2:17 ` Nicholas Piggin
2023-05-08 2:01 ` [PATCH 06/12] powerpc: Mark accesses to power_save callback in arch_cpu_idle Rohan McLure
2023-05-09 2:21 ` Nicholas Piggin
2023-05-08 2:01 ` [PATCH 07/12] powerpc: powernv: Fix KCSAN datarace warnings on idle_state contention Rohan McLure
2023-05-09 2:26 ` Nicholas Piggin
2023-05-10 2:00 ` Rohan McLure
2023-05-08 2:01 ` [PATCH 08/12] powerpc: Annotate accesses to ipi message flags Rohan McLure
2023-05-09 2:28 ` Nicholas Piggin
2023-05-08 2:01 ` [PATCH 09/12] powerpc: Mark writes registering ipi to host cpu through kvm Rohan McLure
2023-05-09 2:30 ` Nicholas Piggin
2023-05-08 2:01 ` [PATCH 10/12] powerpc: powernv: Annotate data races in opal events Rohan McLure
2023-05-09 2:31 ` Nicholas Piggin
2023-05-08 2:01 ` [PATCH 11/12] powerpc: powernv: Annotate asynchronous access to opal tokens Rohan McLure
2023-05-08 2:01 ` [PATCH 12/12] powerpc: Mark asynchronous accesses to irq_data Rohan McLure
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