From nobody Wed Apr 8 08:31:05 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 ECB663D3491; Mon, 30 Mar 2026 13:14:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774876481; cv=none; b=G+jG6nh+mHiAoPpYL38sj/syVGtIqerF5PxnxpvuJAa1+Jv6p/AAw4hBQIQm1wtsjKgrJuRzt6up3NU7JmE2SuxybaDm87E/jmVaJX33AgtHrD6UGnQgBJW/XwkEetLeO9yeMuNQduuOSiojL/oxmOD1oA28d1eInXPxxsqacBE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774876481; c=relaxed/simple; bh=09VheKtseQxbUtBLbnLgcVtPJcvvKuPAZjj1wtlSBJY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=M8ej7iaCzQjbPS0I6rZmkVwGqcl0pZw3exk8/EE2a6U4vOkWaXUiZ43ijKekNf6bkYcJN/vDB2bVA0Jbb30igFyp5p4A/fz8GH0MLOgNMOPI5NRpmTjIzDykP0bv/RSRigr6w/JF1e+dgc3xgMrqJTKQBw20hBayqAe8ls/gFg0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=dVWan8IV; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="dVWan8IV" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7527BC4CEF7; Mon, 30 Mar 2026 13:14:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774876480; bh=09VheKtseQxbUtBLbnLgcVtPJcvvKuPAZjj1wtlSBJY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dVWan8IVCz5RO5OVCF6HlDsglgRcR5wSFaClC04W/PKVOP83gat6kcV/ehT0hFmDi jtYiBX4936PNnyogLWHJeob1tyfuFsLpA9gNsGeKYUtZ6vsFsfMJUqu9KmRS4i9Ubb 8bJ4LyES9RsLs3hYg9xzOj6nSsggDq5idLqXpSMOkCUqbYFa2L4rv8Y8Q0KI68EhiQ LjOwj2o2tIFg2PXzd+2Bt8e35T45WcxhiPqXRlxN74FX+kIywC8Jshq+FwixaHkuxJ +paS1BPr/Q9mhx/MXyGD8pAXercJelZCCWKkvPeWtEhbZIgrBTZ8cRIt8i6syeqMqV NFfPfxbUBkmGA== From: Lucas De Marchi To: Luis Chamberlain , Daniel Gomez , Sami Tolvanen Cc: Lucas De Marchi , Greg Kroah-Hartman , Aaron Tomlin , Petr Pavlu , Daniel Gomez , Phil Sutter , linux-modules@vger.kernel.org, linux-kernel@vger.kernel.org, Christophe Leroy , Christophe Leroy Subject: [PATCH v2 1/2] module: Override -EEXISTS module return Date: Mon, 30 Mar 2026 08:13:51 -0500 Message-ID: <-v2-1-a3542e15111c@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <-v2-0-a3542e15111c@kernel.org> References: <-v2-0-a3542e15111c@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" X-Mailer: b4 0.15.1 X-Developer-Signature: v=1; a=openpgp-sha256; l=1527; i=demarchi@kernel.org; h=from:subject:message-id; bh=09VheKtseQxbUtBLbnLgcVtPJcvvKuPAZjj1wtlSBJY=; b=owEBbQKS/ZANAwAKAZuipaYwy+pTAcsmYgBpynbg21ZmfI2q4ZIz1gWM/RqHDf/7y8cJswgWb NIcf95ZvyqJAjMEAAEKAB0WIQTqszyWkAE8czkWrIOboqWmMMvqUwUCacp24AAKCRCboqWmMMvq U8A5EACkdOMvwH4d5RZEGtJ7gGr2ZQgxttq7DSl/JuSkvyqdxOJqs1L4a4quOD5PsUxIwyV1WRS 1diRRUR0suU4JoFRrX93OjW7/IxP31sFZSuo5dNqDvBhZLzS/q35XDpzHayDo5lr6IDEVNY+r+g aOg7O10MlyoLXanWmyZU7CneuruuLxKbzqEcUPjS8G26HPy8fnDQDSWa4YKKW+TFjsE5n68C45I v01HSoH7kX7PqAPxkkr22CwD4IKc/RzOxweN93u9bgYY9oSI9geybDQWD0c/9ubiPkTQk6dOvmh zAfn64XRTZX59R1XcdaBw0lkL0c3xvfBQqXe1PqpfagBkO1VXwnxEdTOMK9dsGogfZQ7vxIkcSV rby1VZVmFQzN7cUcRWRYQYZETA5JIA3STcL8TI4LiITA4RUnMub0Yn4W1EC5Fo5XrmpvOyTMoF2 aTnXIqrKJwhzCfLqfMKH/CL/e18z0VWmxI9Zdbv/zctQ6ZoZNQM9OUYFNQXYF1Ws5EYgyiaVKMw bA28fgEC7lkMwVFAPvqJOj/TdgEVqIozUw8zihCHgqpdqqoXkrTm/2fcNkCrbbDJYezVvd+w4FT MZatFpXnjIy0zf/VziCa0tx9r+/3oiF5Fp4TZ+OS+1AWoJeFYECzXdlv5Gtq63ZBVf3B7gQuMtA lvAIrNeCZCKPhfw== X-Developer-Key: i=demarchi@kernel.org; a=openpgp; fpr=EAB33C9690013C733916AC839BA2A5A630CBEA53 Content-Transfer-Encoding: quoted-printable The -EEXIST errno is reserved by the module loading functionality. When userspace calls [f]init_module(), it expects a -EEXIST to mean that the module is already loaded in the kernel. If module_init() returns it, that is not true anymore. Override the error when returning to userspace: it doesn't make sense to change potentially long error propagation call chains just because it's will end up as the return of module_init(). Closes: https://lore.kernel.org/all/aKLzsAX14ybEjHfJ@orbyte.nwl.cc/ Cc: Greg Kroah-Hartman Cc: Aaron Tomlin Cc: Petr Pavlu Cc: Daniel Gomez Cc: Phil Sutter Cc: Christophe Leroy Signed-off-by: Lucas De Marchi --- kernel/module/main.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/kernel/module/main.c b/kernel/module/main.c index c3ce106c70af..3b60b7cda329 100644 --- a/kernel/module/main.c +++ b/kernel/module/main.c @@ -3045,6 +3045,14 @@ static noinline int do_init_module(struct module *mo= d) if (mod->init !=3D NULL) ret =3D do_one_initcall(mod->init); if (ret < 0) { + /* + * -EEXIST is reserved by [f]init_module() to signal to usersapace that + * a module with this name is already loaded. Use something else if the + * module itself returning that. + */ + if (ret =3D=3D -EEXIST) + ret =3D -EBUSY; + goto fail_free_freeinit; } if (ret > 0) { --=20 2.53.0 From nobody Wed Apr 8 08:31:05 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 AFD2A3D34A3; Mon, 30 Mar 2026 13:14:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774876487; cv=none; b=bWNaYYuHpsZb9RpqKv4l4f9rKMMAqyp8W2ZYEhEXbHa6QE2CUJ1xuSTEIlm8OokCrSWa+ED7OzgH6hLAcERyP/ZOhlamNR1UpDNiJ6mKPofeU6jHsmC6kGUNvAk+AqUOLO798zqGTYPGSImc42IZzCF6j/YurWpIaPJeE8xIh+E= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774876487; c=relaxed/simple; bh=EhMuN0uAJvnOsTn0xJ6V7AMhb6rZ0tcOzwTCMmNF3EY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=ikjPW3MFvMLWrnslNhWER2m4SFA0qlq/zZugMRlDcZ1LbioROYONPkbG7CsA5XSgmcro5aLWMAtZK3zud6wb2K3ZitwxQHvHeJeH0/hZbYX1aHHgc8KqP+R+vJ70Im3Ikil4iYEyOvyhKmtVWSSe5hF4s32BGPYW8zNAtf2vEK4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=D2qBpJgh; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="D2qBpJgh" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 35E7FC4CEF7; Mon, 30 Mar 2026 13:14:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774876487; bh=EhMuN0uAJvnOsTn0xJ6V7AMhb6rZ0tcOzwTCMmNF3EY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=D2qBpJghmzSdbYDhiuzjlaeeXFYgUSaB/EaqI5PXiP8matUukTPsBT2PIlguS1U0w dc/Rlqy/4YYSkKbO1a3sf7LZUscOTcJcNWKSMnEnV42ZRgEIlayUNxtNgVv/me0XMf Ci7m8nEHiW4/+kUPyZBtLLY2fTNbIMIWbsmRVYUl81uTCeDaSu9uUV6juPDfnBDOVA ZOYlfUKP29EjtuGui7eH6e5o2mfH4bpQwwMtv4rQf03zJKwxf3+t7oztifWUs6XshZ fU828m00cLoK54qsk3h9C09RxCyYwtIrXaEUAZ8luBFTs/ijEphRMTC/QokW68VsPr yCeXnB9lKpPCg== From: Lucas De Marchi To: Luis Chamberlain , Daniel Gomez , Sami Tolvanen Cc: Lucas De Marchi , Greg Kroah-Hartman , Aaron Tomlin , Petr Pavlu , Daniel Gomez , Phil Sutter , linux-modules@vger.kernel.org, linux-kernel@vger.kernel.org, Christophe Leroy Subject: [PATCH v2 2/2] module: Simplify warning on positive returns from module_init() Date: Mon, 30 Mar 2026 08:13:52 -0500 Message-ID: <-v2-2-a3542e15111c@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <-v2-0-a3542e15111c@kernel.org> References: <-v2-0-a3542e15111c@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" X-Mailer: b4 0.15.1 X-Developer-Signature: v=1; a=openpgp-sha256; l=1244; i=demarchi@kernel.org; h=from:subject:message-id; bh=EhMuN0uAJvnOsTn0xJ6V7AMhb6rZ0tcOzwTCMmNF3EY=; b=owEBbQKS/ZANAwAKAZuipaYwy+pTAcsmYgBpynbgMDTJ8X7mUQqurmgBrGn4zLieP0RU9l1Ta I07Ic6j5GqJAjMEAAEKAB0WIQTqszyWkAE8czkWrIOboqWmMMvqUwUCacp24AAKCRCboqWmMMvq UxT6D/0cHtT4l6vRNJZfvyzEQ8Xh9e8T1n3KmbX1lEHZ3xRk0Q+5ceOlEbuhLMHaIRkgTYrACDG p5XdU+/ttyNkOZoBBUQ+LDjZFfMf0hxygVPDek6xbuFsoozCn+/S4SWyed8DJYgoVhMurw9DlHc rAYwqkTjWSgc+P/i+yg4DgAKPXpO/Bm3wm2o4icJs9BcV0/hfWHRPrwJeXQMt1pyrOObLhJrMH0 +/MOC3InaLSW+VhaJ2NCM2z3TGRZhbiBLck4k7mzZvRQiFpXzWt77h4woslBcHirWRrT4XIcYPK GPA1vpHRTdZ+Bad1E1zE/+UcN4szFp5zkwGYzk66RxsdriuNKZD1Sxc9Ve8X3vJks0YpEjWlL8K NeZuyW98oxHCRcchhA+9Q/WLQTZORe3PWTQwZrPReM8Ze43D0h3Y8DA6QdQtlbciyrlix5yZe4T 534FW6FI18LBiSEUIn9g/WyjeRUKfN88yVmo0oKs4FBfeGMwVRI1a7Xrgl4kJ79JdGnFrfmmKfF vsGNlLfKFdx+SRrSpVJdUHEluE3G1j3iTJXcpXlYHJAEIPih55ctwRbJyiI2ldvBLudQQLAvIYX JLVZoT3owQ6t4Q07Kv7iN0/MGnbcEMfpPBh0moTfLS0507Zw8e6Om/yvZVoWeSoBTb0DR3zUsnx j8+OiBbcpiHYkrA== X-Developer-Key: i=demarchi@kernel.org; a=openpgp; fpr=EAB33C9690013C733916AC839BA2A5A630CBEA53 Content-Transfer-Encoding: quoted-printable It should now be rare to trigger this warning - it doesn't need to be so verbose. Make it follow the usual style in the module loading code. For the same reason, drop the dump_stack(). Suggested-by: Petr Pavlu Signed-off-by: Lucas De Marchi Reviewed-by: Aaron Tomlin Reviewed-by: Petr Pavlu Reviewed-by: Daniel Gomez --- kernel/module/main.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) diff --git a/kernel/module/main.c b/kernel/module/main.c index 3b60b7cda329..5aeb5af584b4 100644 --- a/kernel/module/main.c +++ b/kernel/module/main.c @@ -3055,13 +3055,9 @@ static noinline int do_init_module(struct module *mo= d) =20 goto fail_free_freeinit; } - if (ret > 0) { - pr_warn("%s: '%s'->init suspiciously returned %d, it should " - "follow 0/-E convention\n" - "%s: loading module anyway...\n", - __func__, mod->name, ret, __func__); - dump_stack(); - } + if (ret > 0) + pr_warn("%s: init suspiciously returned %d, it should follow 0/-E conven= tion\n", + mod->name, ret); =20 /* Now it's a first class citizen! */ mod->state =3D MODULE_STATE_LIVE; --=20 2.53.0