From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from relay4-d.mail.gandi.net (relay4-d.mail.gandi.net [217.70.183.196]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D4E251A29A for ; Mon, 24 Mar 2025 15:19:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.196 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742829562; cv=none; b=qJuKSSf4wfyFOFyixNeQfnkuvxCWlT18Bq1SLip1LrPlcWvyn7i10ia9WS2cJMfqhfxjiqF5HTbvC8GPrmtQB7I44j/IFR3vEdsXHPebPqB7MWG7wUEOU57uGV7vza8yr6Ya1VAoo4B9JtvP+BFp9NCI6SnRHBPnNDH9qrOwX3E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742829562; c=relaxed/simple; bh=qDyewdwQV/vIscUGcUbDXK3I+TLQXIOl5+OL9Mr6sCQ=; h=Message-ID:Date:MIME-Version:From:Subject:To:Cc:References: In-Reply-To:Content-Type; b=OiO2fxcc9sS7gFDsf47TquL9NhV6020hcJLrADkLNnbRPC75pqNkE5eVPz+hiHhwIczfg74ls+LO0/S1IkVDEggia3myogKnyH/Lnh67YdquCy2IDXqWAOPnaSXtClQXEl9GoeqGpv0A51bt4W9YU34Hj3MWCwjWOdtR3CKnYSA= ARC-Authentication-Results:i=1; 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bh=cEu1XYuEmBNKmsANd2tXhv0BoNUFd3t88gi63JerZLY=; b=JSkzLqy542GEF/91VV5HKjQD7RKhOpeF5clW4Dv5hN/+ZLJkojq5Yu+cjZkArwOSBYYXyb ZmBhqNgqjsJ6GhzVdOtr5vv51H2MTeflOOrjkFUCWJlT4ZiFCB1vkZy/voBsMRVkHf0Che 2z38w/9JongU7oQ08jVCS1SJbSMY/y6PAtgmDz8QNDoyV0oR0XTpUAE7HFmD3Gccobjqbj O+IITZwkFpanrW8ls4XtYgt1bPeq3ocRujhC8jv1zZC/eSsECR7FIj5MGVrd6aEHnRD2lR AE1BnOL1Wezny5X0rdY9+ZjUgZ9s6jI1iDosiQNrXY7sEPo8suwtehJ8yhPc0g== Message-ID: Date: Mon, 24 Mar 2025 16:19:12 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Louis Chauvet Subject: Re: [PATCH v2 26/59] dyndbg: split multi-query strings with % To: Jim Cromie , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org, intel-gvt-dev@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, intel-gfx-trybot@lists.freedesktop.org Cc: jbaron@akamai.com, gregkh@linuxfoundation.org, ukaszb@chromium.org, daniel.vetter@ffwll.ch, tvrtko.ursulin@linux.intel.com, jani.nikula@intel.com, ville.syrjala@linux.intel.com References: <20250320185238.447458-1-jim.cromie@gmail.com> <20250320185238.447458-27-jim.cromie@gmail.com> Content-Language: en-US Autocrypt: addr=louis.chauvet@bootlin.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-GND-State: clean X-GND-Score: -100 X-GND-Cause: gggruggvucftvghtrhhoucdtuddrgeefvddrtddtgdduiedtudduucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuifetpfffkfdpucggtfgfnhhsuhgsshgtrhhisggvnecuuegrihhlohhuthemuceftddunecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefkffggfgfhuffvvehfjggtgfesthekredttddvjeenucfhrhhomhepnfhouhhishcuvehhrghuvhgvthcuoehlohhuihhsrdgthhgruhhvvghtsegsohhothhlihhnrdgtohhmqeenucggtffrrghtthgvrhhnpeetfffhtdeigfehffduuedvkeefgfdvuddugfffteetffdvteffgfejvedugffgffenucffohhmrghinhepsghoohhtlhhinhdrtghomhenucfkphepledtrdekledrudeifedruddvjeenucevlhhushhtvghrufhiiigvpedunecurfgrrhgrmhepihhnvghtpeeltddrkeelrdduieefrdduvdejpdhhvghloheplgduledvrdduieekrddtrddvtdgnpdhmrghilhhfrhhomheplhhouhhishdrtghhrghuvhgvthessghoohhtlhhinhdrtghomhdpnhgspghrtghpthhtohepudegpdhrtghpthhtohepjhhimhdrtghrohhmihgvsehgmhgrihhlrdgtohhmpdhrtghpthhtoheplhhinhhugidqkhgvrhhnvghlsehvghgvrhdrkhgvrhhnvghlrdhorhhgpdhrtghpthhtohepughrihdquggvvhgvlheslhhishhtshdrfhhrvggvuggvshhkthhophdrohhrghdprhgtphhtthhopegrmhguqdhgfhigsehlihhsthhsr dhfrhgvvgguvghskhhtohhprdhorhhgpdhrtghpthhtohepihhnthgvlhdqghhvthdquggvvheslhhishhtshdrfhhrvggvuggvshhkthhophdrohhrghdprhgtphhtthhopehinhhtvghlqdhgfhigsehlihhsthhsrdhfrhgvvgguvghskhhtohhprdhorhhgpdhrtghpthhtohepihhnthgvlhdqghhfgidqthhrhigsohhtsehlihhsthhsrdhfrhgvvgguvghskhhtohhprdhorhhgpdhrtghpthhtohepjhgsrghrohhnsegrkhgrmhgrihdrtghomh X-GND-Sasl: louis.chauvet@bootlin.com Le 20/03/2025 à 19:52, Jim Cromie a écrit : > Since commit > 85f7f6c0edb8 ("dynamic_debug: process multiple debug-queries on a line") > > Multi-query commands have been allowed: > > modprobe drm dyndbg="class DRM_UT_CORE +p; class DRM_UT_KMS +p" > modprobe drm dyndbg=< class DRM_UT_CORE +p > class DRM_UT_KMS +p > EOX > > More recently, the need for quoting was avoided by treating a comma > like a space/token-terminator: > > modprobe drm dyndbg=class,DRM_UT_CORE,+p\;class,DRM_UT_KMS,+p > > That works, but it needs the escaped semicolon, which is a shell > special-char (one of the bash control operators), so it is brittle > when passed in/down/around scripts. In particular, it fails when > passed to vng (virtme-ng). > > So this patch adds '%' to the existing ';' and '\n' multi-command > separators, which is more shell-friendly, so you can more fully avoid > quoting and escaping hassles. > > NOTE: it does break format matching on '%' patterns: > > bash-5.2# ddcmd 'format "find-me: %foo" +p' > [ 203.900581] dyndbg: read 26 bytes from userspace > [ 203.900883] dyndbg: query 0: "format "find-me: " mod:* > [ 203.901118] dyndbg: unclosed quote: find-me: > [ 203.901355] dyndbg: tokenize failed > [ 203.901529] dyndbg: query 1: "foo" +p" mod:* > [ 203.901957] dyndbg: split into words: "foo"" "+p" > [ 203.902243] dyndbg: op='+' flags=0x1 maskp=0xffffffff > [ 203.902458] dyndbg: expecting pairs of match-spec > [ 203.902703] dyndbg: query parse failed > [ 203.902871] dyndbg: processed 2 queries, with 0 matches, 2 errs > bash: echo: write error: Invalid argument > > The '%' splits the input into 2 queries, and both fail. Given the > limited utility of matching against the working parts of a format > string "foo: %d bar %s", nothing is actually lost here. > > Signed-off-by: Jim Cromie Reviewed-by: Louis Chauvet > --- > lib/dynamic_debug.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c > index 168663629ef2..c44502787c2b 100644 > --- a/lib/dynamic_debug.c > +++ b/lib/dynamic_debug.c > @@ -599,7 +599,7 @@ static int ddebug_exec_queries(char *query, const char *modname) > int i, errs = 0, exitcode = 0, rc, nfound = 0; > > for (i = 0; query; query = split) { > - split = strpbrk(query, ";\n"); > + split = strpbrk(query, "%;\n"); > if (split) > *split++ = '\0'; > -- Louis Chauvet, Bootlin Embedded Linux and Kernel engineering https://bootlin.com