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([2001:a61:2482:101:a081:4793:30bf:f3d5]) by smtp.gmail.com with ESMTPSA id l18sm5516910wmj.22.2020.05.13.03.48.52 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 13 May 2020 03:48:52 -0700 (PDT) Cc: mtk.manpages@gmail.com, linux-man@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH 12/14] prctl.2: Clarify the unsupported hardware case of EINVAL To: Dave Martin References: <1589301419-24459-1-git-send-email-Dave.Martin@arm.com> <1589301419-24459-13-git-send-email-Dave.Martin@arm.com> From: "Michael Kerrisk (man-pages)" Message-ID: <12b559c1-21c9-833f-1a5e-37ddad284880@gmail.com> Date: Wed, 13 May 2020 12:48:50 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <1589301419-24459-13-git-send-email-Dave.Martin@arm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-man-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-man@vger.kernel.org Hello Dave, On 5/12/20 6:36 PM, Dave Martin wrote: > prctls that are architecture-specific won't work on other > architectures, and arch-specific prctls that manipulate optional > hardware features likewise won't work if that hardware feature is > not present. > > The established pattern seems to be to treat such prctls as if they > are unimplemented, when attempted on the wrong hardware. > > Cover these cases with some generic weasel words in the closet > existing EINVAL clause. > > Signed-off-by: Dave Martin Thanks. Patch applied Cheers, Michael > --- > man2/prctl.2 | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/man2/prctl.2 b/man2/prctl.2 > index 2361b44..7f511d2 100644 > --- a/man2/prctl.2 > +++ b/man2/prctl.2 > @@ -1616,7 +1616,8 @@ is an invalid address. > .B EINVAL > The value of > .I option > -is not recognized. > +is not recognized, > +or not supported on this system. > .TP > .B EINVAL > .I option > -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/