From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 87B6DC4332F for ; Thu, 21 Apr 2022 08:00:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1386261AbiDUIDj (ORCPT ); Thu, 21 Apr 2022 04:03:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54824 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230260AbiDUIDi (ORCPT ); Thu, 21 Apr 2022 04:03:38 -0400 Received: from mail-ej1-x62a.google.com (mail-ej1-x62a.google.com [IPv6:2a00:1450:4864:20::62a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3EA2926F5; Thu, 21 Apr 2022 01:00:49 -0700 (PDT) Received: by mail-ej1-x62a.google.com with SMTP id ks6so8381139ejb.1; Thu, 21 Apr 2022 01:00:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=IvbH4EZL+5AN5QzEHqEkY2O3ivfSAm4vpHw9+hhvBhg=; b=l9A2zxVr+iaQxUxYrdl2Ms8QPgKKprVPWu836jDS1a9kDgOF87eiKg/WQ2Pp7p0uU5 2yNRXou7K8UFGozJ+zY/Z4nvAWfNQL2rfMjP+xXVlPOuM9uOjKLpuuReXJ/1yNQdQwuh j0rwMLAJikQsK++NSTkjAZZIpdlqPGGrisobY6AkDBUSn+EF1pPZ26RV1iYw2+CmyG9Z D2LmcczIZ72xeD8VaXUH0mDdLEb2aoTOXjcPu5w7P06BXPfBaOVOvqtrL86fe03Il6B4 EOW8KU+HycFTbAN4tLYJDkZ3tbTG01Z6v9mMOvBRakLpz/3LsxFq95QSfevhyaAXz0Qd bVTA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=IvbH4EZL+5AN5QzEHqEkY2O3ivfSAm4vpHw9+hhvBhg=; b=mMPZHqY1pPIrpZpVe91YkXlWi42EV943ExfwYrB94+eLM+JHhgYYiLUWa6wjXQg8Al iEdywdl0d4/O85cxNP9CrMfgunEr0so5FPn9VsMvihlhaXyIyGav2w3Pz8hKIdLofSGP sqDCo49Cdf+BMHN2HPtr97VVyWbBbqPEJ51vjmqNa5nTEJyoDhHK7oVQIjqfgp8YpOS0 LjJDFKdb8qC3TPE1ilQsx7xAk6LAWhCVcrvUNOiTVfgGcdBraWzidRBKmqFpwbirl858 dGp206r/ZOscDjBrkHknCvp2iE/lhcx2aDA8S1VQjjmbrXg6u+78a6wIx0xciaoV+8l0 JdHw== X-Gm-Message-State: AOAM533SzGKV58ctiNpXlv1n0+2cwj9xTh4jrMlCnFkSrH+dT2JiUB/6 RCDpVcjScpNVJ8RUvsWJXTffBt0W0YJz/JJvArI= X-Google-Smtp-Source: ABdhPJwZVRm8KFRbk9B79qovRjYyl5U7m19/ioAtyBVJMdSRPYNtjRxgrnX2fTY7SlA9nxFEZPk7MVR3ZDEQhaVY+/E= X-Received: by 2002:a17:906:5e17:b0:6e8:b6b8:2b09 with SMTP id n23-20020a1709065e1700b006e8b6b82b09mr20915528eju.477.1650528047664; Thu, 21 Apr 2022 01:00:47 -0700 (PDT) MIME-Version: 1.0 References: <20220419111650.1582274-1-Jason@zx2c4.com> <20220419111650.1582274-11-Jason@zx2c4.com> In-Reply-To: <20220419111650.1582274-11-Jason@zx2c4.com> From: Max Filippov Date: Thu, 21 Apr 2022 01:00:36 -0700 Message-ID: Subject: Re: [PATCH v5 10/11] xtensa: use fallback for random_get_entropy() instead of zero To: "Jason A. Donenfeld" Cc: LKML , linux-crypto@vger.kernel.org, Thomas Gleixner , Arnd Bergmann , "Theodore Ts'o" , Dominik Brodowski , Russell King , Catalin Marinas , Will Deacon , Geert Uytterhoeven , Thomas Bogendoerfer , Paul Walmsley , Palmer Dabbelt , Albert Ou , "David S . Miller" , Richard Weinberger , Anton Ivanov , Johannes Berg , Ingo Molnar , Borislav Petkov , Dave Hansen , "H . Peter Anvin" , Chris Zankel , Stephen Boyd , Dinh Nguyen , linux-arm-kernel@lists.infradead.org, "open list:M68K ARCHITECTURE" , linux-mips@vger.kernel.org, linux-riscv , "open list:SPARC + UltraSPAR..." , linux-um@lists.infradead.org, "maintainer:X86 ARCHITECTURE..." , "open list:TENSILICA XTENSA PORT (xtensa)" Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org On Tue, Apr 19, 2022 at 4:18 AM Jason A. Donenfeld wrote: > > In the event that random_get_entropy() can't access a cycle counter or > similar, falling back to returning 0 is really not the best we can do. > Instead, at least calling random_get_entropy_fallback() would be > preferable, because that always needs to return _something_, even > falling back to jiffies eventually. It's not as though > random_get_entropy_fallback() is super high precision or guaranteed to > be entropic, but basically anything that's not zero all the time is > better than returning zero all the time. > > This is accomplished by just including the asm-generic code like on > other architectures, which means we can get rid of the empty stub > function here. > > Cc: Thomas Gleixner > Cc: Arnd Bergmann > Cc: Max Filippov > Signed-off-by: Jason A. Donenfeld > --- > arch/xtensa/include/asm/timex.h | 6 ++---- > 1 file changed, 2 insertions(+), 4 deletions(-) Acked-by: Max Filippov -- Thanks. -- Max From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B80F8C433F5 for ; Thu, 21 Apr 2022 08:01:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Cc:To:Subject:Message-ID:Date:From: In-Reply-To:References:MIME-Version:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=YVeyycgkiLHJILx+alJVMJQEy0kaWzmeBWfJ41jxeXI=; b=AusyDrK//2OUT9 DU65cyo+qwlptfcOQsM2tamHnPH0rRFxq6p9qQru3BFkFmIUVwbkEgGaBeymF8CCPfyfkaBpGTfRN szfhi9KyZR4k2u52DEOVC/pLRUAi/A9zFjoSqZdKrQvu/sSO65A1HNA4Nanq9v0S8NLnDRZ/4N5S9 KfQRPLK/JOJx7cXqq75x4kY6OqkA3rOWguLfNDpvE/ZzWaUVs2ayx9GjFudKk6MLfR4mCCEuqAUED HXgZQ5gumYDcGiNZis4W+tbB/IhdAT5RNq/0Gz3uwTE0Aj7vnJlyo2Gi+jKyWsekt4EjsCUee8wwK N8Hb0L2uts4VZENOrAKA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nhRkR-00CGOl-2a; Thu, 21 Apr 2022 08:01:07 +0000 Received: from mail-ej1-x633.google.com ([2a00:1450:4864:20::633]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nhRkC-00CGHE-Av; Thu, 21 Apr 2022 08:00:53 +0000 Received: by mail-ej1-x633.google.com with SMTP id bv19so8316333ejb.6; Thu, 21 Apr 2022 01:00:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=IvbH4EZL+5AN5QzEHqEkY2O3ivfSAm4vpHw9+hhvBhg=; b=l9A2zxVr+iaQxUxYrdl2Ms8QPgKKprVPWu836jDS1a9kDgOF87eiKg/WQ2Pp7p0uU5 2yNRXou7K8UFGozJ+zY/Z4nvAWfNQL2rfMjP+xXVlPOuM9uOjKLpuuReXJ/1yNQdQwuh j0rwMLAJikQsK++NSTkjAZZIpdlqPGGrisobY6AkDBUSn+EF1pPZ26RV1iYw2+CmyG9Z D2LmcczIZ72xeD8VaXUH0mDdLEb2aoTOXjcPu5w7P06BXPfBaOVOvqtrL86fe03Il6B4 EOW8KU+HycFTbAN4tLYJDkZ3tbTG01Z6v9mMOvBRakLpz/3LsxFq95QSfevhyaAXz0Qd bVTA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=IvbH4EZL+5AN5QzEHqEkY2O3ivfSAm4vpHw9+hhvBhg=; b=doZqW9h3/OGqWrQ1cdHve4hJdQXNzpS9/vyYmlDMJ7Xh4N+0POHfbvPPb0Go+JTuDt oIq5MhAvJ7RYoyIzMyFry8Funz2egRynzluR7KJK1AIdIjwvU3K5ElJKklZnzo0FtGGV PTfhodVj4d4U9qOlKoSOgkDq1pcMvrey1DgwD0LXwZ6mEIcPYjMp2+oWNOsxGZAvLXWg MT3sUreJPCCriq83hQBR9gp6jr+X8gZkU3aJt/25+501GrhkHVtExTYt19dhF7+UqLpc d/pROt1byL5YbPXy2kbbrRz90pa8f5IB4wOYwFDF7km4yp7x1UaSowooY0DFvpjsuMFH mDmA== X-Gm-Message-State: AOAM532rwfvoDHRZyeF9eCrQeG5TCW5C3uNN2MPKU66Fl9z5gBsoMsO1 OW41sX9p/vcyTxQuC+CC/4srAePcmcEOjEMKk/A= X-Google-Smtp-Source: ABdhPJwZVRm8KFRbk9B79qovRjYyl5U7m19/ioAtyBVJMdSRPYNtjRxgrnX2fTY7SlA9nxFEZPk7MVR3ZDEQhaVY+/E= X-Received: by 2002:a17:906:5e17:b0:6e8:b6b8:2b09 with SMTP id n23-20020a1709065e1700b006e8b6b82b09mr20915528eju.477.1650528047664; Thu, 21 Apr 2022 01:00:47 -0700 (PDT) MIME-Version: 1.0 References: <20220419111650.1582274-1-Jason@zx2c4.com> <20220419111650.1582274-11-Jason@zx2c4.com> In-Reply-To: <20220419111650.1582274-11-Jason@zx2c4.com> From: Max Filippov Date: Thu, 21 Apr 2022 01:00:36 -0700 Message-ID: Subject: Re: [PATCH v5 10/11] xtensa: use fallback for random_get_entropy() instead of zero To: "Jason A. Donenfeld" Cc: LKML , linux-crypto@vger.kernel.org, Thomas Gleixner , Arnd Bergmann , "Theodore Ts'o" , Dominik Brodowski , Russell King , Catalin Marinas , Will Deacon , Geert Uytterhoeven , Thomas Bogendoerfer , Paul Walmsley , Palmer Dabbelt , Albert Ou , "David S . Miller" , Richard Weinberger , Anton Ivanov , Johannes Berg , Ingo Molnar , Borislav Petkov , Dave Hansen , "H . Peter Anvin" , Chris Zankel , Stephen Boyd , Dinh Nguyen , linux-arm-kernel@lists.infradead.org, "open list:M68K ARCHITECTURE" , linux-mips@vger.kernel.org, linux-riscv , "open list:SPARC + UltraSPAR..." , linux-um@lists.infradead.org, "maintainer:X86 ARCHITECTURE..." , "open list:TENSILICA XTENSA PORT (xtensa)" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220421_010052_405561_FF490B57 X-CRM114-Status: GOOD ( 18.00 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On Tue, Apr 19, 2022 at 4:18 AM Jason A. Donenfeld wrote: > > In the event that random_get_entropy() can't access a cycle counter or > similar, falling back to returning 0 is really not the best we can do. > Instead, at least calling random_get_entropy_fallback() would be > preferable, because that always needs to return _something_, even > falling back to jiffies eventually. It's not as though > random_get_entropy_fallback() is super high precision or guaranteed to > be entropic, but basically anything that's not zero all the time is > better than returning zero all the time. > > This is accomplished by just including the asm-generic code like on > other architectures, which means we can get rid of the empty stub > function here. > > Cc: Thomas Gleixner > Cc: Arnd Bergmann > Cc: Max Filippov > Signed-off-by: Jason A. Donenfeld > --- > arch/xtensa/include/asm/timex.h | 6 ++---- > 1 file changed, 2 insertions(+), 4 deletions(-) Acked-by: Max Filippov -- Thanks. -- Max _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 0E98CC433EF for ; Thu, 21 Apr 2022 08:02:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Cc:To:Subject:Message-ID:Date:From: In-Reply-To:References:MIME-Version:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=baCI/ViB4JQmDZSfm72TidmZhb32wm8b0wMoKI6osM0=; b=EbeesslgYLXRnB mpQNZYpa/7hbCYq5z2KpH6sLPjACZMtt3kV72zCSxOUJxZ1NQV0Jr7avQnzXu47v4/yWMqL65jMTl jcqLqiNvvo9BWqbGoad/D3Mn4uNCi8NKfYEXPApylBTUI1V7sq6TvEFSYcekkLKh3RkvwAecppfai 6Jt3e3kqSIPqmKdwhBep4EyH4rV6zokLMW+eTO/W3tBQyQp48G6aucRw8zqHVUP28+4cgp0zJb9EI x+hSBGy2L7CNSnYoFJb+Zytncle5JsYchwCNqm7P4tNA6bIAY8N24i3DPhqSU5BhbWmhV9dvJCe+l puVBlu+MhmkRLSYta4SA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nhRkF-00CGKd-UJ; Thu, 21 Apr 2022 08:00:56 +0000 Received: from mail-ej1-x633.google.com ([2a00:1450:4864:20::633]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nhRkC-00CGHE-Av; Thu, 21 Apr 2022 08:00:53 +0000 Received: by mail-ej1-x633.google.com with SMTP id bv19so8316333ejb.6; Thu, 21 Apr 2022 01:00:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=IvbH4EZL+5AN5QzEHqEkY2O3ivfSAm4vpHw9+hhvBhg=; b=l9A2zxVr+iaQxUxYrdl2Ms8QPgKKprVPWu836jDS1a9kDgOF87eiKg/WQ2Pp7p0uU5 2yNRXou7K8UFGozJ+zY/Z4nvAWfNQL2rfMjP+xXVlPOuM9uOjKLpuuReXJ/1yNQdQwuh j0rwMLAJikQsK++NSTkjAZZIpdlqPGGrisobY6AkDBUSn+EF1pPZ26RV1iYw2+CmyG9Z D2LmcczIZ72xeD8VaXUH0mDdLEb2aoTOXjcPu5w7P06BXPfBaOVOvqtrL86fe03Il6B4 EOW8KU+HycFTbAN4tLYJDkZ3tbTG01Z6v9mMOvBRakLpz/3LsxFq95QSfevhyaAXz0Qd bVTA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=IvbH4EZL+5AN5QzEHqEkY2O3ivfSAm4vpHw9+hhvBhg=; b=doZqW9h3/OGqWrQ1cdHve4hJdQXNzpS9/vyYmlDMJ7Xh4N+0POHfbvPPb0Go+JTuDt oIq5MhAvJ7RYoyIzMyFry8Funz2egRynzluR7KJK1AIdIjwvU3K5ElJKklZnzo0FtGGV PTfhodVj4d4U9qOlKoSOgkDq1pcMvrey1DgwD0LXwZ6mEIcPYjMp2+oWNOsxGZAvLXWg MT3sUreJPCCriq83hQBR9gp6jr+X8gZkU3aJt/25+501GrhkHVtExTYt19dhF7+UqLpc d/pROt1byL5YbPXy2kbbrRz90pa8f5IB4wOYwFDF7km4yp7x1UaSowooY0DFvpjsuMFH mDmA== X-Gm-Message-State: AOAM532rwfvoDHRZyeF9eCrQeG5TCW5C3uNN2MPKU66Fl9z5gBsoMsO1 OW41sX9p/vcyTxQuC+CC/4srAePcmcEOjEMKk/A= X-Google-Smtp-Source: ABdhPJwZVRm8KFRbk9B79qovRjYyl5U7m19/ioAtyBVJMdSRPYNtjRxgrnX2fTY7SlA9nxFEZPk7MVR3ZDEQhaVY+/E= X-Received: by 2002:a17:906:5e17:b0:6e8:b6b8:2b09 with SMTP id n23-20020a1709065e1700b006e8b6b82b09mr20915528eju.477.1650528047664; Thu, 21 Apr 2022 01:00:47 -0700 (PDT) MIME-Version: 1.0 References: <20220419111650.1582274-1-Jason@zx2c4.com> <20220419111650.1582274-11-Jason@zx2c4.com> In-Reply-To: <20220419111650.1582274-11-Jason@zx2c4.com> From: Max Filippov Date: Thu, 21 Apr 2022 01:00:36 -0700 Message-ID: Subject: Re: [PATCH v5 10/11] xtensa: use fallback for random_get_entropy() instead of zero To: "Jason A. Donenfeld" Cc: LKML , linux-crypto@vger.kernel.org, Thomas Gleixner , Arnd Bergmann , "Theodore Ts'o" , Dominik Brodowski , Russell King , Catalin Marinas , Will Deacon , Geert Uytterhoeven , Thomas Bogendoerfer , Paul Walmsley , Palmer Dabbelt , Albert Ou , "David S . Miller" , Richard Weinberger , Anton Ivanov , Johannes Berg , Ingo Molnar , Borislav Petkov , Dave Hansen , "H . Peter Anvin" , Chris Zankel , Stephen Boyd , Dinh Nguyen , linux-arm-kernel@lists.infradead.org, "open list:M68K ARCHITECTURE" , linux-mips@vger.kernel.org, linux-riscv , "open list:SPARC + UltraSPAR..." , linux-um@lists.infradead.org, "maintainer:X86 ARCHITECTURE..." , "open list:TENSILICA XTENSA PORT (xtensa)" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220421_010052_405561_FF490B57 X-CRM114-Status: GOOD ( 18.00 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Apr 19, 2022 at 4:18 AM Jason A. Donenfeld wrote: > > In the event that random_get_entropy() can't access a cycle counter or > similar, falling back to returning 0 is really not the best we can do. > Instead, at least calling random_get_entropy_fallback() would be > preferable, because that always needs to return _something_, even > falling back to jiffies eventually. It's not as though > random_get_entropy_fallback() is super high precision or guaranteed to > be entropic, but basically anything that's not zero all the time is > better than returning zero all the time. > > This is accomplished by just including the asm-generic code like on > other architectures, which means we can get rid of the empty stub > function here. > > Cc: Thomas Gleixner > Cc: Arnd Bergmann > Cc: Max Filippov > Signed-off-by: Jason A. Donenfeld > --- > arch/xtensa/include/asm/timex.h | 6 ++---- > 1 file changed, 2 insertions(+), 4 deletions(-) Acked-by: Max Filippov -- Thanks. -- Max _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel