linux-kernel - Re: [PATCH v5 05/19] arm64: Add support for trace synchronization barrier

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Message-ID: <875z1gk6fo.wl-maz@kernel.org>
Date:   Wed, 24 Mar 2021 13:49:31 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Suzuki K Poulose <suzuki.poulose@....com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        coresight@...ts.linaro.org, mike.leach@...aro.org,
        leo.yan@...aro.org, anshuman.khandual@....com,
        Will Deacon <will.deacon@....com>
Subject: Re: [PATCH v5 05/19] arm64: Add support for trace synchronization barrier

On Wed, 24 Mar 2021 09:39:13 +0000,
Suzuki K Poulose <suzuki.poulose@....com> wrote:
> 
> On 23/03/2021 18:21, Catalin Marinas wrote:
> > Hi Suzuki?
> > 
> > On Tue, Mar 23, 2021 at 12:06:33PM +0000, Suzuki K Poulose wrote:
> >> tsb csync synchronizes the trace operation of instructions.
> >> The instruction is a nop when FEAT_TRF is not implemented.
> >> 
> >> Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
> >> Cc: Mike Leach <mike.leach@...aro.org>
> >> Cc: Catalin Marinas <catalin.marinas@....com>
> >> Cc: Will Deacon <will.deacon@....com>
> >> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> > 
> > How do you plan to merge these patches? If they go via the coresight
> > tree:
> > 
> 
> Ideally all of this should go via the CoreSight tree to have the
> dependencies solved at one place. But there are some issues :
> 
> If this makes to 5.13 queue for CoreSight,
> 
> 1) CoreSight next is based on rc2 at the moment and we have fixes gone
> into rc3 and later, which this series will depend on. (We could move
> the next tree forward to a later rc to solve this).
> 
> 2) There could be conflicts with the kvmarm tree for the KVM host
> changes (That has dependency on the TRBE definitions patch).
> 
> If it doesn't make to 5.13 queue, it would be good to have this patch,
> the TRBE defintions and the KVM host patches queued for 5.13 (not sure
> if this is acceptable) and we could rebase the CoreSight changes on 5.13
> and push it to next release.
> 
> I am open for other suggestions.
> 
> Marc, Mathieu,
> 
> Thoughts ?

I was planning to take the first two patches in 5.12 as fixes (they
are queued already, and would hopefully land in -rc5). If that doesn't
fit with the plan, please let me know ASAP.

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.