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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: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 0DC4AA000F X-Stat-Signature: g1q63doxbprgpe7q9dcg4qpswbcekc63 X-Rspam-User: X-HE-Tag: 1763525377-421090 X-HE-Meta: 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 lPVLcP1E ajJYJvVY6cTfIyyz1jPBDxZ1eqMfM5mCv5LbmN9HU/lefB+XNZhYWTa2EWXrTVHHaQEqmsWOcNTcBZatVPmBT87txmwizwfKHoPTWJZPxP1t/AGP3MImlwQljOj7uSYNn+A7bDUNSp4ZWMWN0LgIHVDc+Z7zogZLGPsn03T+mC5nq2BBSNCG2HLx20bZspuDjlbVjNRDDBKge4yZYFaPiwGcBPA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.001377, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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.