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[88.187.86.199]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-454a99666c3sm5944585e9.2.2025.07.02.12.00.48 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Wed, 02 Jul 2025 12:00:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1751482850; x=1752087650; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=TRx7/96Mso9UmfpnJ3Y/UVAgu4AkhnN2JiUpQ3Sf7Yc=; b=hVmTT5QWWv0OxukJ+egmzz6EcKRX/PDekckngl/yU1i6HQVhFrR0Yb3NXiHUwn4FHL nIlQ71ecqW+ZtKkem3a6x62k3E6E3VrGYPr71o9HFSK0fiPKqcCNAZWao5MxSk0YJlU2 EIXZN0Mou8DSMwnv7UVyAlku8CuMCFu/OMUmVO/Cz2vvWOnM+S1fZI0nM44NXZdEhFH6 rztnDzWDh/fx6nKPJ3GMsR4bnC/fZIVS+JT+x0noUpBXrifjin2dzbSWE9SaT+TFCxaq PguZOGH0vsR4HIEMxCNnWR0evLg1anJW+MxYh6SPyknimpiYppqdGFggWfLIl1jHW45H lNFg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1751482850; x=1752087650; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=TRx7/96Mso9UmfpnJ3Y/UVAgu4AkhnN2JiUpQ3Sf7Yc=; b=FsQCqPTrUe4L+Vg7RdEfCX11Znaz6lo55Pq03dxMi7BoUxtBjGDHZ2FFUrDosh4qap xQqhnq52kfcQ3CXAPtdWV39RHTjDZHrwSS1XpO6Wd8omDErjUgZm+lUuG7wU7z3imPz9 5DN/9AnDCFSKHYc51TgT1KghSTWMCdQH5+vzs1HU4DMxxkxG7CikfwF6nAzdgtLKhKX1 t/Rkx77svDY2w2FGgW8JJsu6E0m68TFMCKf3NVwCuPLeJFeKaY3Ba2JQV9zxpT7I/Qsh TwNyG9Iiy2SgB2D8j9YewepbLiGDJjz83Gay2hx0Xn/zIM8O4QrgYCk9UpKTYcyClk7x qb0g== X-Gm-Message-State: AOJu0Yzqh0U1a+Cx88hMHy5gxpA4XsQcCyps1b9vleBBZVxWYos57pJR Z7CPNSwLSToXnx8re+j/D+OBgDIVxS6r2af10YT+N86GmPeqOFGaJ1kb39o2jH01l0KvHy3y2hN qO6AS X-Gm-Gg: ASbGncu04CZtj69xdAMa4SuEUyz+H1W0UBxEffCC+ynx1AjnQ1N1nTc/bWaOsYA5W1g MiW2oOi6/KkexFx84hxIbfSw473uUZvZEpiJUMBEHXWhf1P2BdarzRLZ5chH6fAk5ekzekz7vi+ MpvDl0x4iVVZkBxnkzxzGMvWmP91EMKQS7aZoRQzy1pQLVcyVW7zmjO49ck9O9rhZURdBq8Hzx9 HLOXLjUAywbazpHZBwhyJW3IIUzM+R4yI9DTI1LxVA6dmZZe5k1llvMBWJXAfbiBFDDfBpkDtg/ WH+OunYn8IXnzxbYKSJC6k0/CDuds6mI/1j4TTkp+CwAfNoU2VSdqPs0T7RGPwLAXbz0T+6zAa7 MfQPQgVg00c6pQt0+2wiJPVJ4KzPLmGG8wlVU X-Google-Smtp-Source: AGHT+IG4DC4uuDFCymsJ+/FV+tDN8gNO9K9ncPSXurLKCaKPAh75YjQlMO3bhSQ06P+dyCOnMdMx2A== X-Received: by 2002:a05:600c:3b15:b0:453:66f:b96e with SMTP id 5b1f17b1804b1-454a36e59e5mr37171125e9.11.1751482849766; Wed, 02 Jul 2025 12:00:49 -0700 (PDT) From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Alex=20Benn=C3=A9e?= , Paolo Bonzini , Richard Henderson , Pierrick Bouvier , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Subject: [PATCH v4 65/65] accel/tcg: Unregister the RCU before exiting RR thread Date: Wed, 2 Jul 2025 20:53:27 +0200 Message-ID: <20250702185332.43650-66-philmd@linaro.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250702185332.43650-1-philmd@linaro.org> References: <20250702185332.43650-1-philmd@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::334; envelope-from=philmd@linaro.org; helo=mail-wm1-x334.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, T_SPF_TEMPERROR=0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1751483360410116600 Although unreachable, still unregister the RCU before exiting the thread, as documented in "qemu/rcu.h": /* * Important ! * * Each thread containing read-side critical sections must be registered * with rcu_register_thread() before calling rcu_read_lock(). * rcu_unregister_thread() should be called before the thread exits. */ Signed-off-by: Philippe Mathieu-Daud=C3=A9 Acked-by: Richard Henderson Reviewed-by: Pierrick Bouvier Reviewed-by: Zhao Liu --- accel/tcg/tcg-accel-ops-rr.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/accel/tcg/tcg-accel-ops-rr.c b/accel/tcg/tcg-accel-ops-rr.c index d976daa7319..0aa4ba393a4 100644 --- a/accel/tcg/tcg-accel-ops-rr.c +++ b/accel/tcg/tcg-accel-ops-rr.c @@ -313,6 +313,8 @@ static void *rr_cpu_thread_fn(void *arg) rr_deal_with_unplugged_cpus(); } =20 + rcu_unregister_thread(); + g_assert_not_reached(); } =20 --=20 2.49.0