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McKenney" Cc: linux-kernel@vger.kernel.org, Frederic Weisbecker , Neeraj Upadhyay , Joel Fernandes , Josh Triplett , Boqun Feng , Uladzislau Rezki , Steven Rostedt , Lai Jiangshan , Zqiang , Davidlohr Bueso , Kunwu Chan , Puranjay Mohan , rcu@vger.kernel.org Date: Wed, 11 Nov 2026 11:37:13 -0800 In-Reply-To: <0782c3e7-9766-440c-b21e-e89b822927ee@efficios.com> References: <20261111145949.70845-1-mathieu.desnoyers@efficios.com> <50d177ddb1de4b84e9fd2cbd2ec5bdb7e32845d4.camel@infradead.org> <0782c3e7-9766-440c-b21e-e89b822927ee@efficios.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-uM2NVO5XBDhg2WXjSF0Z" User-Agent: Evolution 3.62.0-0ubuntu1~ppa1~24.04 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html --=-uM2NVO5XBDhg2WXjSF0Z Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2026-11-11 at 14:33 -0500, Mathieu Desnoyers wrote: > On 2026-11-11 14:02, David Woodhouse wrote: > > The latter claim is only true in __srcu_read_lock_fast()/_fast_updown() > > isn't it? Not in the atomic-SRCU. Unless we do something like this on > > top? >=20 > It is true for the atomic readers as well.=C2=A0 Without > CONFIG_NEED_SRCU_NMI_SAFE, include/linux/srcu.h defines > __srcu_read_lock_nmisafe() as an inline that calls __srcu_read_lock(), > and the same for unlock.=C2=A0 So x86 keeps this_cpu_inc() and smp_mb(). > Your diff selects the same functions by hand. >=20 > Only the architectures that select NEED_SRCU_NMI_SAFE get the atomic > increments. 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