From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out162-62-57-49.mail.qq.com (out162-62-57-49.mail.qq.com [162.62.57.49]) (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 36F361DDA18; Wed, 19 Nov 2025 04:09:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=162.62.57.49 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763525388; cv=none; b=jce2e32RZPGmwnQfr3zfIH02/F1JQTgRvuICLJhvAVAYJwxAaaSt6YIttQBjVgrzbNwSUNctA5rnmMynrNfyXNMqPmgJuwZ1I/XbfbT8T/TyRsWgOVM2BJpLUFCwAKZDsfAix/DYvEtw+9QMVbkhGC5dQymRAx54OqZub32zSNE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763525388; c=relaxed/simple; bh=H5yKS32BQuCKm8u+J7ZXZMVHHkiZ52CYE7eepE2wbw0=; h=Message-ID:From:To:Cc:Subject:Date:In-Reply-To:References: MIME-Version; b=oeZVjAiikON9gfGB/q/H8L+bDa9pDSZ50ehPw2JCWNlJBvBhBMNTrr0e7Ow0RDfpLioCjsrKWILU4IN/1b5Hi4vcFrGJbNgP0bF5UwApBv2WLshcAa9AMaqZuWnYqKwLlPPTIOqAF9s3awWCJ7C+yugtwsxRKdnAKANc4VEB+Qc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=foxmail.com; spf=pass smtp.mailfrom=foxmail.com; dkim=pass (1024-bit key) header.d=foxmail.com header.i=@foxmail.com header.b=hXW0B20i; arc=none smtp.client-ip=162.62.57.49 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=foxmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=foxmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=foxmail.com header.i=@foxmail.com header.b="hXW0B20i" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=foxmail.com; s=s201512; t=1763525374; bh=Qi2rddwojXbTrZJFwpSOry4P0NpvHwP/7WohDB6ZufA=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=hXW0B20ipgYdpv947r1CjHIvPM6vXBSpPycfa5qAyjCpI7dvd9yzgeeQ9gk3ho6/w UOj9zpW8j5pe4aP+/Op+G6pY5tT37XjiPUPRfDMvANveUwW+Zi3NXha2P/sEHfkcwR W4buji8Ubz8VZYUg57V5yU9jU+4hvkrGGXrbzz9Y= Received: from meizu-Precision-3660.meizu.com ([14.21.33.152]) by newxmesmtplogicsvrsza36-0.qq.com (NewEsmtp) with SMTP id 25EAF47D; Wed, 19 Nov 2025 12:09:30 +0800 X-QQ-mid: xmsmtpt1763525370tx4vs152f Message-ID: X-QQ-XMAILINFO: MVa6T+CC+5BrANV1TTOpO4+KMwMRZVgcDDvc37ypycJMpmOOTVBOoZR3Y/zkdi Uh764ZeAk2HDJesJr0Q8X86yHdtQNx/cNeFxpJS3G0dJskm9zAQHnjP8B51KDqt3Hto8NNG+69YZ bYL3P9VS9rxgLCx7FxHDERRx0EYxKVSv11z+0Dh2cgkReA+Frj57wW9tyz2DV1H28HbWqhWIRqMD cDddxysh1W5sm0Ft0c0MCj3KvJ8lpvbVz2siFbulWrftXne4O9Xg7RHQ7cTz0zmpJfVGCRL06Pk2 bmoPyoHQeLgPVtlpgm7niYUJWz90Z+dUd72ekvn5GokFMC8l2U6cpxpaOqQLpZ+XGpq7nC1p/o/1 UewonC/EN2vA39A7AD+U2selJb2XJ7LkzcfFKRQQjwO1EtHgEazP2OvkCv2ATV1bSxVcI9lkxH2+ GA7tkUdOeBoZLjXovMGjqbu2dA4xGapJw621E2LgiYQfQ66VyXpccEJAWn7VcTrhj3QZQtpil/Sj obBxFBtbZaXU0hN6oH/340UDZ+HR92oQ0ZSwkd3lK5ICATHSPqidSBfONe9p1ZRb02Fc6mA4u5eV pBpsM+n8qigsrroZ9utvho0mwttmC13VG8emmRveCnA0+xKBB0ckfr8M8LmfKsrEjTE8DenbYv4+ /eIc0UueSmZ07N4W1X89VKpR3vax+qrVt4b3rh1bwAylpBIKvGuoytkPDcs7TtfsDpQYaowXJVED yg7CAW2OyCqn+NMitFGpKCzQLQZxVkE/ASvoiCRPkhNPyg/zDWzIc6VsITf158UWh/mEXY9di5Ab 8Zztp/icWhM6MjzmmWk6t9apuL3ei7N2eYHlCoI4qt0BB2ImuknrtZWWwbY3KJimpmXHjgbV99xH JenkOZIO45o/dIrgu1DLdFUWnmBHGluaIX6JXugzMFa8a+SfTTkGE5S2Igsw8lbVl3H1nkwpsxTJ QrQE5XQ0EHocKorqDN1rPlLUVRPkJ9hi+oFHgS+og0dwA/wDkNRrXcTH6VlF8UGmecik5wPT0dkU O1B8zLj9Jafqzz88CZLF46CgJ0mP9yGy+xfiEVpLLWDPxfvlR+fv7B597AsxiOgJ7zrPhm0AKv47 iRIXgIoU4IqrMT9Lf8lvNprSbSemHAwly5r0MtUtJ86DEWF7o4pt9+Kdon0jJ3QVhWL1CNqEljO7 2oBj1JO2t2k7UlvA== X-QQ-XMRINFO: NI4Ajvh11aEj8Xl/2s1/T8w= From: Yuwen Chen To: ywen.chen@foxmail.com Cc: akpm@linux-foundation.org, bgeffon@google.com, licayy@outlook.com, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, minchan@kernel.org, richardycc@google.com, senozhatsky@chromium.org Subject: RE: [PATCH v3] zram: Fix the issue that the write - back limits might overflow Date: Wed, 19 Nov 2025 12:09:30 +0800 X-OQ-MSGID: <20251119040930.2875269-1-ywen.chen@foxmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On Wed, 19 Nov 2025 12:01:57 +0800, Yuwen Chen wrote: > + /* > + * When the page size is greater than 4KB, if bd_wb_limit is set to > + * a value that is not page - size aligned, it will cause value > + * wrapping. For example, when the page size is set to 16KB and > + * bd_wb_limit is set to 3, a single write - back operation will > + * cause bd_wb_limit to become -1. Even more terrifying is that > + * bd_wb_limit is an unsigned number. > + */ Sorry, I forgot to check the code format here.