From nobody Wed Oct 1 21:34:01 2025 Received: from fanzine2.igalia.com (fanzine2.igalia.com [213.97.179.56]) (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 A8CC02D0C9F for ; Wed, 1 Oct 2025 17:56:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.97.179.56 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759341395; cv=none; b=ZdOd8svksH5GEh1LtP9va1JnzvLX4wYdheyAs4ndbZl9Bq85GA7fPgkkFUil9E7LbKJ4eKVqaUvgKK8oGLkZcfsGMWWmKNklUYlZHFDYoe6JV6nUEHLP+5hcOBhLAnyBU9Wlgod4cJuR0Y1oVBZ1RfkdNIcHuj72GKU8Z7wirCY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759341395; c=relaxed/simple; bh=DGHrA71q9LC2gqZCNU5YsojWnUP7S7smVpWqz558TCE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Loryi602SJ3ffqFt2n1f6pmQSpyKlKwuzc0N+LjdmwCqkqnJW/kfklWbWtykjlirQktYH17wP4O8zSwUfR6gLCmYHGU7vXFrzxJtktw/X07OxupxSFomaJVAi2zCU1i8y44iGRfnmgNn6VcXrJxIkoXt2Hb2wihwWt53jjLK50Q= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=igalia.com; spf=pass smtp.mailfrom=igalia.com; dkim=pass (2048-bit key) header.d=igalia.com header.i=@igalia.com header.b=JQDFI9If; arc=none smtp.client-ip=213.97.179.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=igalia.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=igalia.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=igalia.com header.i=@igalia.com header.b="JQDFI9If" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=igalia.com; s=20170329; h=Content-Transfer-Encoding:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:Cc:To:From:Sender:Reply-To:Content-Type:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=aJLopUjdg6abKCdBvFBz2DgGEx0e5f4MfKDCPhNtEqM=; b=JQDFI9IfVzCldlJpfK4bDQaE2h QPZss9dMFj0eA7iTfB27+w6qVnSPeygo5lxNEtyUrgPhoiaOlidBrxoosMvgoF3FO/bI2rtzmdfip 3udzdqkBWoOX/Y+ZMYGBGH2DwwYHgA5zlhvSEtFEzfGf/cMc/tJfbtv6bWWGvimPOFA7Kz5NV5AdK CxDZx7EX7SLzc8HPsfwez15Np4eY4ZG9wPb7wVKCP1RVEyWxtzXu9Wzk+LQ25EvOl0vf/0pJ3N6tZ VP2qp4U09BusUl12XBDA1JMhjkfyIK3S8x9Gw0HLPq5bJPNkNuW6Kmjz+Kvs8Fu1PsZKx0+ejvSk8 3HZjscww==; Received: from [179.159.118.139] (helo=localhost.localdomain) by fanzine2.igalia.com with esmtpsa (Cipher TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim) id 1v413v-002xd4-Lk; Wed, 01 Oct 2025 19:56:24 +0200 From: Mauricio Faria de Oliveira To: Michal Hocko , Vlastimil Babka , Andrew Morton Cc: Oscar Salvador , Suren Baghdasaryan , Brendan Jackman , Johannes Weiner , Zi Yan , linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-dev@igalia.com Subject: [PATCH v2 1/5] mm/page_owner: introduce struct stack_print_ctx Date: Wed, 1 Oct 2025 14:56:07 -0300 Message-ID: <20251001175611.575861-2-mfo@igalia.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20251001175611.575861-1-mfo@igalia.com> References: <20251001175611.575861-1-mfo@igalia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Currently, struct seq_file.private is used as an iterator in stack_list by stack_start|next(), for stack_print(). Create a context struct for this, in order to add another field next. No behavior change intended. P.S.: page_owner_stack_open() is expanded with separate statements for variable definition and return just in preparation for the next patch. Signed-off-by: Mauricio Faria de Oliveira --- mm/page_owner.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) diff --git a/mm/page_owner.c b/mm/page_owner.c index c3ca21132c2c..c1a7d7afe945 100644 --- a/mm/page_owner.c +++ b/mm/page_owner.c @@ -45,6 +45,10 @@ static struct stack failure_stack; static struct stack *stack_list; static DEFINE_SPINLOCK(stack_list_lock); =20 +struct stack_print_ctx { + struct stack *stack; +}; + static bool page_owner_enabled __initdata; DEFINE_STATIC_KEY_FALSE(page_owner_inited); =20 @@ -856,6 +860,7 @@ static const struct file_operations proc_page_owner_ope= rations =3D { static void *stack_start(struct seq_file *m, loff_t *ppos) { struct stack *stack; + struct stack_print_ctx *ctx =3D m->private; =20 if (*ppos =3D=3D -1UL) return NULL; @@ -867,9 +872,9 @@ static void *stack_start(struct seq_file *m, loff_t *pp= os) * value of stack_list. */ stack =3D smp_load_acquire(&stack_list); - m->private =3D stack; + ctx->stack =3D stack; } else { - stack =3D m->private; + stack =3D ctx->stack; } =20 return stack; @@ -878,10 +883,11 @@ static void *stack_start(struct seq_file *m, loff_t *= ppos) static void *stack_next(struct seq_file *m, void *v, loff_t *ppos) { struct stack *stack =3D v; + struct stack_print_ctx *ctx =3D m->private; =20 stack =3D stack->next; *ppos =3D stack ? *ppos + 1 : -1UL; - m->private =3D stack; + ctx->stack =3D stack; =20 return stack; } @@ -926,7 +932,10 @@ static const struct seq_operations page_owner_stack_op= =3D { =20 static int page_owner_stack_open(struct inode *inode, struct file *file) { - return seq_open_private(file, &page_owner_stack_op, 0); + int ret =3D seq_open_private(file, &page_owner_stack_op, + sizeof(struct stack_print_ctx)); + + return ret; } =20 static const struct file_operations page_owner_stack_operations =3D { --=20 2.48.1