From patchwork Wed Mar 8 06:59:27 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Martin KaFai Lau X-Patchwork-Id: 13165288 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C0C30C6FD1E for ; Wed, 8 Mar 2023 07:00:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229835AbjCHHAQ (ORCPT ); Wed, 8 Mar 2023 02:00:16 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47536 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229729AbjCHHAO (ORCPT ); Wed, 8 Mar 2023 02:00:14 -0500 Received: from out-4.mta1.migadu.com (out-4.mta1.migadu.com [IPv6:2001:41d0:203:375::4]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DA510A1FDA for ; Tue, 7 Mar 2023 23:00:13 -0800 (PST) X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1678258812; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=UVK+7aVsZBZbHw4uT6sVYjoHjigsAu6AGe0/Ho5JF00=; b=pSWjb6F7Fe5mx1oGc5qcCdYqJtFuqynLWjcc7szlY8Mn5Wsp5q8cq+o2zhseVxw/EXeNwk XVITEAagYVELkSawxwXe86IQUPbuot8vHK87JzQVoqeMd34QK0yV+Nf5SV/UiL5DaPy4km rIoVgvHJzAVNKthjs+VbhLld++Ud+o0= From: Martin KaFai Lau To: bpf@vger.kernel.org Cc: Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , kernel-team@meta.com Subject: [PATCH v2 bpf-next 08/17] bpf: Add bpf_selem_free_rcu callback Date: Tue, 7 Mar 2023 22:59:27 -0800 Message-Id: <20230308065936.1550103-9-martin.lau@linux.dev> In-Reply-To: <20230308065936.1550103-1-martin.lau@linux.dev> References: <20230308065936.1550103-1-martin.lau@linux.dev> MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net From: Martin KaFai Lau Add bpf_selem_free_rcu() callback to do the kfree() instead of using kfree_rcu. It is a preparation work for using bpf_mem_cache_alloc/free in a later patch. Signed-off-by: Martin KaFai Lau --- kernel/bpf/bpf_local_storage.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/kernel/bpf/bpf_local_storage.c b/kernel/bpf/bpf_local_storage.c index 715deaaefe13..146e9caeda96 100644 --- a/kernel/bpf/bpf_local_storage.c +++ b/kernel/bpf/bpf_local_storage.c @@ -109,15 +109,20 @@ static void bpf_local_storage_free_rcu(struct rcu_head *rcu) kfree_rcu(local_storage, rcu); } -static void bpf_selem_free_trace_rcu(struct rcu_head *rcu) +static void bpf_selem_free_rcu(struct rcu_head *rcu) { struct bpf_local_storage_elem *selem; selem = container_of(rcu, struct bpf_local_storage_elem, rcu); + kfree(selem); +} + +static void bpf_selem_free_trace_rcu(struct rcu_head *rcu) +{ if (rcu_trace_implies_rcu_gp()) - kfree(selem); + bpf_selem_free_rcu(rcu); else - kfree_rcu(selem, rcu); + call_rcu(rcu, bpf_selem_free_rcu); } /* local_storage->lock must be held and selem->local_storage == local_storage. @@ -174,7 +179,7 @@ static bool bpf_selem_unlink_storage_nolock(struct bpf_local_storage *local_stor if (!reuse_now) call_rcu_tasks_trace(&selem->rcu, bpf_selem_free_trace_rcu); else - kfree_rcu(selem, rcu); + call_rcu(&selem->rcu, bpf_selem_free_rcu); if (rcu_access_pointer(local_storage->smap) == smap) RCU_INIT_POINTER(local_storage->smap, NULL);