From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=199.89.1.14 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793046840; b=S/LwZpjuLyMLvou5lWAs5I3Aca67Z+3tezNW2RRzhZXsblMzScWo9Dt8XtSmb4Jb3P38 COyy+FlEs52kS1/dTj0jt8en2sKwMJ8xQ6mo+iKWGiRHOfdqGFD5Q7faglmedbPX9OfvA N6dNLDObp/tCZAbxhV4BALP1aX2WSGmf6+AEQXB6S94awh7QGb6LXjG5GW1Dw+RTfns0I 7OZHnR0ApP5F5D2jKHdXPPkCxH+UiTxcA6BBvR7Ap4ULnfNXiLIgnXg0nvo+7UQVyk4Fl NPzriXnklnPs4gzFhWu/7hveCEvexrlFvPwGge//8CaLsSAXFayYMAPGHTykqe4Oq6g== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793046840; h=DMARC-Filter:Received:DKIM-Signature:X-Virus-Scanned:Received: Received:Message-ID:Date:MIME-Version:User-Agent:Subject:To:Cc: References:Content-Language:From:In-Reply-To:Content-Type: Content-Transfer-Encoding; bh=SyrOD4nxK3+1VMgtAgfF49M56P+HbkcbMWd7Pxr1oWA=; b=mlOKvsLpXoPKiKMBco8L04AoLHvIV2MwHlxmd8poT2DV0qIZpRJT4CAPdLSiifl5aH+5 LP2t96c5X59VHjuy9fkhwX0QMdtxshPkltZllI9vvR3qc/U9O0smRkSiirqD1+GWOTvOC MCXWwUpz4VLjzWk8/UAy6WPahxRqBHu9K0yZebEBdMVeISgASmXrzTqEJ/nWEhE4s3obN lVooWko/BDUVGUbZ6MFcgdNC5pekEX8ZRYJds8lFHbQdMJ2PlQxGcfU47V6wILJtqtqdE NIL92zC2+/UkmQMEDMOWvxBeWNJkc6Di24sTzM2g9KC4ETYA/z4UCKtJhubojK0E3RA== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=acm.org; spf=pass smtp.mailfrom=acm.org; dkim=pass header.d=acm.org header.i=@acm.org header.a=rsa-sha256 header.s=mr01 header.b=redyjGAN; arc=none smtp.remote-ip=199.89.1.14 Received: from 011.lax.mailroute.net (011.lax.mailroute.net [199.89.1.14]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 711DC60A261A for ; Mon, 26 Oct 2026 20:34:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 711DC60A261A Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=acm.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=acm.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=acm.org header.i=@acm.org header.a=rsa-sha256 header.s=mr01 header.b=redyjGAN Received: from localhost (localhost [127.0.0.1]) by 011.lax.mailroute.net (Postfix) with ESMTP id 4jD51z6Tzdz1XM30g; Mon, 26 Oct 2026 20:33:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=acm.org; h= content-transfer-encoding:content-type:content-type:in-reply-to :from:from:content-language:references:subject:subject :user-agent:mime-version:date:date:message-id:received:received; s=mr01; t=1793046836; x=1795638837; bh=SyrOD4nxK3+1VMgtAgfF49M5 6P+HbkcbMWd7Pxr1oWA=; b=redyjGANn7/hLRfLhs7aJOh09mMJ913xMSk7MTEI vI3Yk+s+p0yVkDCpMQBkATobFCWeKjI8MDdl0Oya5kGyVhdhQsB9tiSqma0WpJB7 sHOYpy//JNNKr8/wHwR1F4f1zN75z9KZ4j/OBxG9BUTnaaaG7d+V/Aie0C8HOot2 3t7Ug0ZcZlVN+N2eGMbrCfj4VEbPEPREZZQ9Ma9SCJ+ZtFr1eaLmOMcrzskC9qVx AF//O5TWyviTss8PWYHm/E5RHvzMsokAro2J90COLpQhWZ70awNRGOz2yh8ivxOS 6X98WWQKVFaNO3retvSGawqTYBryI8QkJ9wRl339k6TEpw== X-Virus-Scanned: by MailRoute Received: from 011.lax.mailroute.net ([127.0.0.1]) by localhost (011.lax [127.0.0.1]) (mroute_mailscanner, port 10029) with LMTP id HsMcfnYmj2MV; Mon, 26 Oct 2026 20:33:56 +0000 (UTC) Received: from [100.80.231.125] (unknown [104.135.182.41]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: bvanassche@acm.org) by 011.lax.mailroute.net (Postfix) with ESMTPSA id 4jD51v6xNKz1XM4Tl; Mon, 26 Oct 2026 20:33:55 +0000 (UTC) Message-ID: <54994cfa-ced0-4eb0-bc7a-43b860c6ec19@acm.org> Date: Mon, 26 Oct 2026 13:33:55 -0700 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 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] powerpc/iommu: Fix an RCU read lock leak in mm_iommu_is_devmem() To: Markus Elfring , linuxppc-dev@lists.ozlabs.org, Madhavan Srinivasan Cc: LKML , Christophe Leroy , Michael Ellerman , Nicholas Piggin , Ritesh Harjani , Shrikanth Hegde References: <56f0c45723ee53149a21ceb599010e957457afd8.1793044370.git.bvanassche@acm.org> Content-Language: en-US From: Bart Van Assche In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable On 10/26/26 1:27 PM, Markus Elfring wrote: > Under which circumstances would you become interested to apply a statem= ent > like =E2=80=9Cguard(rcu)();=E2=80=9D? I will leave it to the PowerPC maintainers to share their preference. Bart.