linux-kernel - Re: [PATCH v1 0/2] net: xfrm: Use seqcount_spinlock

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Message-ID: <20210323081353.GM62598@gauss3.secunet.de>
Date:   Tue, 23 Mar 2021 09:13:53 +0100
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     "Ahmed S. Darwish" <a.darwish@...utronix.de>
CC:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Sebastian A. Siewior" <sebastian.siewior@...utronix.de>
Subject: Re: [PATCH v1 0/2] net: xfrm: Use seqcount_spinlock_t

On Tue, Mar 16, 2021 at 11:56:28AM +0100, Ahmed S. Darwish wrote:
> Hi,
> 
> This is a small series to trasform xfrm_state_hash_generation sequence
> counter to seqcount_spinlock_t, instead of plain seqcount_t.
> 
> In general, seqcount_LOCKNAME_t sequence counters allows to associate
> the lock used for write serialization with the seqcount. This enables
> lockdep to verify that the write serialization lock is always held
> before entering the seqcount write section.
> 
> If lockdep is disabled, this lock association is compiled out and has
> neither storage size nor runtime overhead.
> 
> The first patch is a general mainline fix, and has a Fixes tag.
> 
> Thanks,
> 
> 8<----------
> 
> Ahmed S. Darwish (2):
>   net: xfrm: Localize sequence counter per network namespace
>   net: xfrm: Use sequence counter with associated spinlock

Applied to the ipsec tree, thanks a lot!