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[34.150.221.228]) by smtp.gmail.com with ESMTPSA id k19-20020a05620a415300b006cdd0939ffbsm11398318qko.86.2022.11.16.19.16.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 16 Nov 2022 19:16:05 -0800 (PST) From: "Joel Fernandes (Google)" To: linux-kernel@vger.kernel.org Cc: "Joel Fernandes (Google)" , Cong Wang , David Ahern , "David S. Miller" , Eric Dumazet , Hideaki YOSHIFUJI , Jakub Kicinski , Jamal Hadi Salim , Jiri Pirko , netdev@vger.kernel.org, Paolo Abeni , rcu@vger.kernel.org, rostedt@goodmis.org, paulmck@kernel.org, fweisbec@gmail.com Subject: [PATCH rcu/dev 3/3] net: Use call_rcu_flush() for dst_destroy_rcu Date: Thu, 17 Nov 2022 03:15:50 +0000 Message-Id: <20221117031551.1142289-3-joel@joelfernandes.org> X-Mailer: git-send-email 2.38.1.584.g0f3c55d4c2-goog In-Reply-To: <20221117031551.1142289-1-joel@joelfernandes.org> References: <20221117031551.1142289-1-joel@joelfernandes.org> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1749711747723525932?= X-GMAIL-MSGID: =?utf-8?q?1749711747723525932?= In a networking test on ChromeOS, we find that using the new CONFIG_RCU_LAZY causes a networking test to fail in the teardown phase. The failure happens during: ip netns del Using ftrace, I found the callbacks it was queuing which this series fixes. Use call_rcu_flush() to revert to the old behavior. With that, the test passes. Signed-off-by: Joel Fernandes (Google) --- net/core/dst.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/core/dst.c b/net/core/dst.c index bc9c9be4e080..15b16322703f 100644 --- a/net/core/dst.c +++ b/net/core/dst.c @@ -174,7 +174,7 @@ void dst_release(struct dst_entry *dst) net_warn_ratelimited("%s: dst:%p refcnt:%d\n", __func__, dst, newrefcnt); if (!newrefcnt) - call_rcu(&dst->rcu_head, dst_destroy_rcu); + call_rcu_flush(&dst->rcu_head, dst_destroy_rcu); } } EXPORT_SYMBOL(dst_release);