From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 3C5AC435EE1 for ; Mon, 13 Jul 2026 13:55:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783950902; cv=none; b=h9L+qJC/rklULpMFWj0v3K92RA68DXs3KXZM6CN5COuJX6vBUVEDsgTxDjxGVXQPdMlrzNXXuQnt3c0432fYPn6Dz4mvKI0qDgsDttEVbt+ms1MjIz3D/GT9rmjxHuOxZFgIKf91twMJwcP3AoSkKnt0X3zhX23jEJVPOJWLIf0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783950902; c=relaxed/simple; bh=cq+OR67xMFzkdsm1Pc7yv+aZtvjtvtKLYzvaR0PShII=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=m3F11ZLCOIdf35I2bFDoWGPQOkeUjkKBpNG+yO/QABc1UWk9eYqE1Bbd75PvqDPRN05xv+Iz4shsxyXwO0z3ZUd1NQVlJFWJPlQnRxVUXPDemt+ucI0HzNDJLCg3KfSfFWVnmwEHS4rS66u4tKuLa3LuBix199PP3ae5um7fRck= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=j9w9rBXO; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="j9w9rBXO" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C18831F000E9; Mon, 13 Jul 2026 13:54:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783950901; bh=xzRBgncFk7244VmHF9tKjOq5GKtMKBEExPzmIhMTCIU=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=j9w9rBXOsZ+0dL0dqPx1BbdBzQYaSRiA68YSdY3vmi05moH1Nx2oLkXi9Y//k9Dku a30n3oyKZPFpFSWrp/jzRuBm9AWERDzTtAreSu54sy/RxnaSqHdbxGmo5iH4wQ15gl mw95toW6/uDvwivt4nVQ8RtDyL0BCkHRT6opUrixHNyjgl+zj6EM3TZSUTCbygh+1Z V708X5v7pPu9YOf/3oZCxqLNsqzabEz6SMehmobPeBB0ndhI5sbjmbGLqnA5Spizt3 CyOQEMy4pU75d3EYowTRqBvnHwXTkDfHxIeCUfTzcE9yLxkbZqWdzIoblJYmm/S/jb wn4U5ynZVQFzg== Message-ID: <1b1d0523-6eda-4fd8-9e22-a4a14c869bb0@kernel.org> Date: Mon, 13 Jul 2026 15:54:57 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1] mm/slub: add comment explaining intentional kobject handling in sysfs_slab_add Content-Language: en-US To: Hongling Zeng , harry@kernel.org, akpm@linux-foundation.org, hao.li@linux.dev, cl@gentwo.org, rientjes@google.com, roman.gushchin@linux.dev, vdavydov.dev@gmail.com, davej@fedoraproject.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, zhongling0719@126.com References: <20260713070024.153552-1-zenghongling@kylinos.cn> From: "Vlastimil Babka (SUSE)" Autocrypt: addr=vbabka@kernel.org; keydata= xsFNBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSNWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBrZXJuZWwub3JnPsLBsAQTAQoAWhYhBKlA1DSZLC6OmRA9UCJPp+fM gqZkBQJqFFy6GxSAAAAAAAQADm1hbnUyLDIuNSsxLjEyLDIsMgIbAwUJGtCBUAULCQgHAwUV CgkICwUWAgMBAAIeBQIXgAAKCRAiT6fnzIKmZJIUEADFx/tREzUImHrEwVHeSvDFmA7tJysI UVrlvrM09E7GIuzphzv7jYmo8n3ANpCczLEVr4G0syYQdTigaZgv3+FQDIIzhKih1IHhu1Ei XHlywNWKnQxxQEUNi5Mwx43wQz5XVw9F1A7gtKBKNtfogO511hAbrzagrYajyQacEJ/+sfhZ 9Da8ltHIXD8pcYaHUfQgEusCgmEd9+KrUwrTbckFKmYq5chuE6yJ4J0EmWknL096jIE6CnzF FRslQ3B1UKDjxVsm1ZHfir5NeWszLkTvGFsddFaWTgh8UycESG6VQzKXjjewXu2pG7YQYRpj QKm1W5X2TkwWkXRBZTmfmbhxIUMh3+zf5wQ463rSmDN/8v81tdqBtAW6rH/kzg1GvkaTHXn0 507yEHFzBksk2viAuIxxr7km8+/KARYLIdGtx30EG8cKzAUZOK6WqxtNCsXUJNrVE8CWrCaD icoNu7Fs1c5hmPHdSTnU48ce67449DdnO4neLSNhRiGlMHJgfJUmgrxu/hcYeOZ3haWmEQ2w uW1Mh01OHi8QZHCEyAbABrPs9GUgccc/4eYXX9hIgxfSkYzn8f+8NuIFPWl/0uTvjgqU29FQ SbzOLxHq9439Ox40G5mS5eZXRGxITYR+6TXvRGI6P/264jvflnr/pDGUttaikU+0W+1uxgKH cmYbEc7ATQRbGTU1AQgAn0H6UrFiWcovkh6EXVcl+SeqyO6JHOPm+e9Wu0Vw+VIUvXZVUVVQ La1PQDUi6j00ChlcR66g9/V0sPIcSutacPKfdKYOBvzd4rlhL8rfrdEsQw5ApZxrA8kYZVMh FmBRKAa6wos25moTlMKpCWzTH84+WO5+ziCTsTUZASAToz3RdunTD+vQcHj0GqNTPAHK63sf bAB2I0BslZkXkY1RLb/YhuA6E7JyEd2pilZOrIuBGl/5q2qSakgnAVFWFBR/DO27JuAksYnq +aH8vI0xGvwn75KqSk4UzAkDzWSmO4ZHuahKtQgZNsMYV+PGayRBX9b9zbldzopoLBdqHc4n jQARAQABwsF8BBgBCgAmAhsMFiEEqUDUNJksLo6ZED1QIk+n58yCpmQFAmfIHFQFCRYU6J8A CgkQIk+n58yCpmS2PA//bqN1LfcotmArgElsa+0EGZSQlYgK48pm8WAeTXTngudP9IJ4SuKY HR5RNjHcBeqN+Me0zxRqYzRb8nGanHEkDyf4Im8DQM8d6vbyU+FcPmG4skud4kgS1zMHnlVd SXfSIwKC/hKgdHG8aBV7545Lz9X6Iohea+94wneD0aw/hqF+QWewGZhWJriWAZtvEkzNjQOi 4U9F/trLten/x7bpphDSnDMKJtITbtzATT1Dq7o7VpIUK1nCTQALMuMjKCdi8OdU/+V+R3O4 0PXWvX8qrvqYapVbZ+9KqT74FsuB0Ya9uXwgBF2Q6cRuETZk5vqaqKxzqoQZCO8AOz/58j6O 2RHNy/mZEN+7tJ5Tsq42zVJ4jxsT8b9YplavCMsnBgDeRWhcbYhCyttoL7nYISyWg4kQYZ/P wIV3OuNv2f8iKYsxNsRuClOAF82+gvqOy1/1pprFjy8uo2pkoOrb63aOP3vO5VHnRKgra6dq NcaZ+c6J4H+nEJGi2SkHAUJz5oBzuThvPudLvPA/SK8sKoM01IRxSihev/S/5WLazXB1PGem OCbvzC1IjWJJraxiDJ5IygokapUa2RP7+WBR22skQ3SSl6G107QgWKSyTOGWEaRmV53vxQLV jXuCmzSSasTL60zq5yGrT4/DYQVSNEUiUbG4pYekxJujNeEDkUlky0Y= In-Reply-To: <20260713070024.153552-1-zenghongling@kylinos.cn> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 7/13/26 09:00, Hongling Zeng wrote: > Add a comment to clarify why we don't call kobject_put() when > kobject_init_and_add() fails in sysfs_slab_add(). > > Per commit 2420baa8e046 ("mm/slab: Allow cache creation to proceed > even if sysfs registration fails"), sysfs failures are treated as > non-fatal and the cache continues to be used. Calling kobject_put() > would trigger slab_kmem_cache_release() which frees the entire > cache structure, so we intentionally skip it. > > Suggested-by: Harry Yoo > Signed-off-by: Hongling Zeng Thanks, added to slab/for-next > --- > Change in v1: > -Correct the email > --- > mm/slub.c | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/mm/slub.c b/mm/slub.c > index 9ec774dc7009..edc822d7d9ea 100644 > --- a/mm/slub.c > +++ b/mm/slub.c > @@ -9690,6 +9690,11 @@ static int sysfs_slab_add(struct kmem_cache *s) > > s->kobj.kset = kset; > err = kobject_init_and_add(&s->kobj, &slab_ktype, NULL, "%s", name); > + /* > + * Intentionally skip kobject_put(). See commit 2420baa8e046 > + * ("mm/slab: Allow cache creation to proceed even if sysfs > + * registration fails") > + */ > if (err) > goto out; >