From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ej1-f74.google.com (mail-ej1-f74.google.com [209.85.218.74]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CA43C11CA2 for ; Fri, 14 Jul 2023 10:20:59 +0000 (UTC) Received: by mail-ej1-f74.google.com with SMTP id a640c23a62f3a-99388334de6so97198566b.0 for ; Fri, 14 Jul 2023 03:20:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20221208; t=1689330058; x=1691922058; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=ake/2lNPSYG4Kup6Znr90jxcuDjnCQa+kK9QxHmxIwE=; b=FdFgSbE9EX08KPCV3DFRa0KauNWmUSSKQuD9KCfK4mOB1MOb00hUTblNSomfgkxhXE lktUE68J2GJstAUj/3c+jsVLoFGKsyNmD+spCDoSEq9pliOoU/eTeGKuECVOQJrW96JW 0DVOb7zMv+7uYhP2k11Kxl4mudnbg+7chPKt8ON/beLgn35QBKRpxoMgV1d5B1uNfFG3 AgxMMV52IQLUcoM3lpUr88qrhOm889EDxsbpie2PXgMV/VEPfl+Rvtil+sLok6f8e1nb hqEwDY8sB3TJuxoDWtQB6lvtOAXTfuQNn+0jvX40UPp1Eoy/88cODPzkhRG3lBSO3Q1c ul/w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1689330058; x=1691922058; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=ake/2lNPSYG4Kup6Znr90jxcuDjnCQa+kK9QxHmxIwE=; b=S+7s7SDxMOKjtqNYwN99q/qXbLi+PtlLRX9Tc5qGKeCUfdlMop7h0ETo7Izr0jkAv2 1YSSkpuB60to+aFh0dNaStEyTJHsNt8mKk2n6wTA/z19JnG/BpEaYbusVD0G5LY74bJQ Pwroyxu1oj9/xSraABFsxrs6aHF6q1YQK22pjBV90xWaond751hVClX0OViw8lLUFIyE 3IETsr7r4J545jaUOxi+XB0ryJDyFNF2haV+i6j17VA6EsW3JThywRmuTioMC3Ksc1FX 1YrX8sgksDBe2M8iXC9oeoNt5i7TDFZmWD25+yXuTffB0R+MPol+VX/K0nl6p1YhUnRf mZgw== X-Gm-Message-State: ABy/qLajpEVnTT1Hmf3ZEhZ6YrYZp98z8htAD0+zDjXCRLMW65mUUyUj Zl8QWC34R6TboEa6Rj/egOGQfZhJv0sLgtM= X-Google-Smtp-Source: APBJJlFUTjwiYHQXGcSMMNCtJzQc7XCp95jN1C2fnAoH9M2eakhZaTVLYzm8MTgye2tlwRUOsp8FX+gnfVMrb1M= X-Received: from aliceryhl.c.googlers.com ([fda3:e722:ac3:cc00:31:98fb:c0a8:6c8]) (user=aliceryhl job=sendgmr) by 2002:a17:906:8a62:b0:978:67a2:f503 with SMTP id hy2-20020a1709068a6200b0097867a2f503mr8783ejc.12.1689330057916; Fri, 14 Jul 2023 03:20:57 -0700 (PDT) Date: Fri, 14 Jul 2023 10:15:01 +0000 In-Reply-To: <20230714-classless_lockdep-v1-1-229b9671ce31@asahilina.net> Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20230714-classless_lockdep-v1-1-229b9671ce31@asahilina.net> X-Mailer: git-send-email 2.41.0.255.g8b1d071c50-goog Message-ID: <20230714101501.2194205-1-aliceryhl@google.com> Subject: Re: [PATCH RFC 01/11] rust: types: Add Opaque::zeroed() From: Alice Ryhl To: lina@asahilina.net Cc: alex.gaynor@gmail.com, alyssa@rosenzweig.io, asahi@lists.linux.dev, benno.lossin@proton.me, bjorn3_gh@protonmail.com, boqun.feng@gmail.com, daniel@ffwll.ch, gary@garyguo.net, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev, marcan@marcan.st, masahiroy@kernel.org, nathan@kernel.org, ndesaulniers@google.com, nicolas@fjasle.eu, ojeda@kernel.org, rust-for-linux@vger.kernel.org, sven@svenpeter.dev, trix@redhat.com, wedsonaf@gmail.com, Alice Ryhl Content-Type: text/plain; charset="UTF-8" Asahi Lina writes: > Opaque types are internally MaybeUninit, so it's safe to actually > zero-initialize them as long as we don't claim they are initialized. > This is useful for many FFI types that are expected to be zero-inited by > the user. > > Signed-off-by: Asahi Lina LGTM. This is useful on its own. Reviewed-by: Alice Ryhl