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X-CSE-ConnectionGUID: sfo2kn34TVOLgaD68kRtqg== X-CSE-MsgGUID: NcuPlU0IQBi/nXesVkzsHA== X-IronPort-AV: E=McAfee;i="6700,10204,11427"; a="60001975" X-IronPort-AV: E=Sophos;i="6.15,275,1739865600"; d="scan'208";a="60001975" Received: from fmviesa003.fm.intel.com ([10.60.135.143]) by fmvoesa104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 May 2025 11:33:49 -0700 X-CSE-ConnectionGUID: KWdvAj8bRbOTx2+TsBcW5w== X-CSE-MsgGUID: heKlrp96To6gdwYJHwX/YA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.15,275,1739865600"; d="scan'208";a="140762395" Received: from inaky-mobl1.amr.corp.intel.com (HELO [10.125.108.203]) ([10.125.108.203]) by fmviesa003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 May 2025 11:33:49 -0700 Message-ID: <7f237574d9f08a9fa8dcaa60d2edf8d8e91441d4.camel@linux.intel.com> Subject: Re: [PATCH v2 2/2] alloc_tag: keep codetag iterator active between read() calls From: Tim Chen To: David Wang <00107082@163.com>, surenb@google.com, kent.overstreet@linux.dev, akpm@linux-foundation.org Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org Date: Fri, 09 May 2025 11:33:48 -0700 In-Reply-To: <20250509173929.42508-1-00107082@163.com> References: <20250507175500.204569-1-00107082@163.com> <20250509173929.42508-1-00107082@163.com> Autocrypt: addr=tim.c.chen@linux.intel.com; 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charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.4 (3.50.4-1.fc39) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Sat, 2025-05-10 at 01:39 +0800, David Wang wrote: >=20 >=20 > Signed-off-by: David Wang <00107082@163.com> > --- > lib/alloc_tag.c | 29 ++++++++++------------------- > 1 file changed, 10 insertions(+), 19 deletions(-) >=20 > diff --git a/lib/alloc_tag.c b/lib/alloc_tag.c > index 25ecc1334b67..fdd5887769a6 100644 > --- a/lib/alloc_tag.c > +++ b/lib/alloc_tag.c > @@ -45,21 +45,16 @@ struct allocinfo_private { > static void *allocinfo_start(struct seq_file *m, loff_t *pos) > { > struct allocinfo_private *priv; > - struct codetag *ct; > loff_t node =3D *pos; > =20 > - priv =3D kzalloc(sizeof(*priv), GFP_KERNEL); > - m->private =3D priv; > - if (!priv) > - return NULL; > - > - priv->print_header =3D (node =3D=3D 0); > + priv =3D (struct allocinfo_private *)m->private; > codetag_lock_module_list(alloc_tag_cttype, true); > - priv->iter =3D codetag_get_ct_iter(alloc_tag_cttype); > - while ((ct =3D codetag_next_ct(&priv->iter)) !=3D NULL && node) > - node--; > - > - return ct ? priv : NULL; > + if (node =3D=3D 0) { > + priv->print_header =3D true; > + priv->iter =3D codetag_get_ct_iter(alloc_tag_cttype); > + codetag_next_ct(&priv->iter); > + } Do you need to skip print header when *pos !=3D 0? i.e add } else { priv->print_header =3D false; } Tim > + return priv->iter.ct ? priv : NULL; > } > =20