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[192.222.136.102]) by smtp.gmail.com with ESMTPSA id 69-20020a370c48000000b00746777fd176sm5025558qkm.26.2023.03.22.07.50.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 22 Mar 2023 07:50:54 -0700 (PDT) Message-ID: Subject: Re: [RFC 2/4] media: videobuf2: Replace bufs array by a list From: Nicolas Dufresne To: Laurent Pinchart , Hans Verkuil Cc: David Laight , Benjamin Gaignard , "tfiga@chromium.org" , "m.szyprowski@samsung.com" , "mchehab@kernel.org" , "ming.qian@nxp.com" , "shijie.qin@nxp.com" , "eagle.zhou@nxp.com" , "bin.liu@mediatek.com" , "matthias.bgg@gmail.com" , "angelogioacchino.delregno@collabora.com" , "tiffany.lin@mediatek.com" , "andrew-ct.chen@mediatek.com" , "yunfei.dong@mediatek.com" , "stanimir.k.varbanov@gmail.com" , "quic_vgarodia@quicinc.com" , "agross@kernel.org" , "andersson@kernel.org" , "konrad.dybcio@linaro.org" , "ezequiel@vanguardiasur.com.ar" , "p.zabel@pengutronix.de" , "daniel.almeida@collabora.com" , "linux-media@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-mediatek@lists.infradead.org" , "linux-arm-msm@vger.kernel.org" , "linux-rockchip@lists.infradead.org" , "kernel@collabora.com" Date: Wed, 22 Mar 2023 10:50:52 -0400 In-Reply-To: <20230319233358.GD20234@pendragon.ideasonboard.com> References: <20230313135916.862852-1-benjamin.gaignard@collabora.com> <20230313135916.862852-3-benjamin.gaignard@collabora.com> <20230313181155.GC22646@pendragon.ideasonboard.com> <86df05244d974416903e919d387a0a0b@AcuMS.aculab.com> <20230319233358.GD20234@pendragon.ideasonboard.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.46.4 (3.46.4-1.fc37) MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Laurent, Le lundi 20 mars 2023 =C3=A0 01:33 +0200, Laurent Pinchart a =C3=A9crit=C2= =A0: > > The typical usage is that applications allocate N buffers with the > > VIDIOC_REQBUFS ioctl, and in most cases that's all they use. >=20 > Note that once we get DELETE_BUF (or DELETE_BUFS) support I'd like to > encourage applications to use the new API, and deprecate REQBUFS > (dropping it isn't on my radar, as it would take forever before no > userspace uses it anymore). I was wondering if you can extend on this. I'm worried the count semantic m= ight prevent emulating it over create_bufs() ops, but if that works, did you mea= nt to emulate it so driver no longer have to implement reqbufs() if they have create_bufs() ? Nicolas