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Tue, 2 Nov 2021 17:40:56 +0000 Date: Tue, 2 Nov 2021 20:40:28 +0300 From: Dan Carpenter To: LABBE Corentin Cc: mchehab@kernel.org, hverkuil@xs4all.nl, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-staging@lists.linux.dev, mjpeg-users@lists.sourceforge.net Subject: Re: [PATCH v2 04/10] staging: media: zoran: add debugfs Message-ID: <20211102174027.GK2794@kadam> References: <20211013185812.590931-1-clabbe@baylibre.com> <20211013185812.590931-5-clabbe@baylibre.com> <20211014073752.GM8429@kadam> Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) X-ClientProxiedBy: JN2P275CA0031.ZAFP275.PROD.OUTLOOK.COM (2603:1086:0:2::19) To MWHPR1001MB2365.namprd10.prod.outlook.com (2603:10b6:301:2d::28) MIME-Version: 1.0 Received: from kadam (62.8.83.22) by JN2P275CA0031.ZAFP275.PROD.OUTLOOK.COM (2603:1086:0:2::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4649.17 via Frontend Transport; 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Just make it always on? > > > > Hello > > I love to provides choice to user (and so avoid a dep on DEBUG_FS), even if I think I am the only one remaining user. Sorry, for the delay, I was on vacation. No, there is no depends on DEBUG_FS in the method that I am describing. How that works is when DEBUG_FS is turned on then it's on for everything, but when it's disabled it's disabled for everything. You do not need the "depends on DEBUG_FS" and if you make this an option the it feels like it should be a selects DEBUG_FS instead. How this normally works is that when you have debugfs disabled, there are dummy files in the debugfs .h files. I bet the compiler can tell most of those are empty and removes them. So if you have DEBUG_FS then it doesn't use that much more memory than when VIDEO_ZORAN_DEBUG is disabled. I don't know if I'm being clear at all #jetlag. It should be easy to check. Just remove the "depends on DEBUG_FS" and enable VIDEO_ZORAN_DEBUG. Disable DEBUG_FS. It should still build fine because of the dummy functions. That's build 1. Then disable VIDEO_ZORAN_DEBUG and that's build 2. See how much memory difference there is between 1 and 2. regards, dan carpenter