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Fri, 16 Dec 2022 20:14:27 -0500 X-MC-Unique: rJ2yzcc0MLug9guEPquZmw-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id DE6D53804534; Sat, 17 Dec 2022 01:14:26 +0000 (UTC) Received: from localhost (ovpn-12-34.pek2.redhat.com [10.72.12.34]) by smtp.corp.redhat.com (Postfix) with ESMTPS id BE9E7492C14; Sat, 17 Dec 2022 01:14:25 +0000 (UTC) Date: Sat, 17 Dec 2022 09:14:22 +0800 From: Baoquan He To: kernel test robot Cc: linux-kernel@vger.kernel.org, oe-kbuild-all@lists.linux.dev, linux-mm@kvack.org, stephen.s.brennan@oracle.com, urezki@gmail.com, willy@infradead.org, akpm@linux-foundation.org, hch@infradead.org Subject: Re: [PATCH v1 3/7] mm/vmalloc.c: allow vread() to read out vm_map_ram areas Message-ID: References: <20221204013046.154960-4-bhe@redhat.com> <202212041124.bwd5pjCd-lkp@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <202212041124.bwd5pjCd-lkp@intel.com> X-Scanned-By: MIMEDefang 3.1 on 10.11.54.9 X-Rspamd-Queue-Id: 80994140004 X-Stat-Signature: qs3u8bqt9apba3bxqw4s355197f8nsih X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1671239671-73835 X-HE-Meta: U2FsdGVkX1+DhvcwG52HaIBFp9RIDJa51F2VlmWjN4MsYMQl0MF7HOOcY32JZjDKcQNLv9dC2XQugR+L9RzMjF42I5PMSlvwykiauF//fXJ0E6cw/sp3JA1XoVoIk4d1T7NY0bOVgBRVRfchbuvnsuIaCxF1vsqs5xUziKWnkFzM0ImR8szik9HfApyx0UIuxX/9ZPPqcqN7PyBdN4q4BKv8Du+QFWr0zpfucXY1Co6RcQ4cXnx9vJyPyQO5rEn8Jj2KL0QQXl4hUuijkJFJDbKJGElAMmOEaiTz40R5jWWvnXKJndIcs/eTn8V0XUixDV3i2g3+MrGtSHbyycdiy6CvKlMj1iZGiFFvtTxysyJrnVaZ83P2q0ITzHoJAGph6+3MqUec2OdL4Og43BD2Zuz8pvFMDolCH8BYIoVrtUQOfp3tQ/VKvJbPayv3rI4MJ+EifFNa4AAzPKv9w7HsVe61odPBSF46SRwb6NJmXhW/zfedaJj6yIIblmBNiVX14nSo7YizpqFJ/36J7msV1EDql9/XqAe4kKl2egAm+6PjNJRDdF2ns/+hvHsnozPXeYUb0yLEJr3nTZVMrJqhi9L0GCvD8pa95G9m9vCLbGBz4VAKV9bSjm8y0kH04CdjVOQTxhRCgih5enlzkJf1XGyQQaafi0tIHgEumpjTkk8APLVyWkMm8C3tV9YnZs1nvHxgGoxID20ukXP5FGOvHI5+62JHGjSGVwikQBjMD1GTJ/fOgzHGG18JDJoRUpET2jlr0l9JsUxSHjaffZ0ytk0AiYQHFW5fKy92EhLJ8dD1hbricoP07eqq+oJauJvBfg1Xx40WPwWJCfr+iilFFV3YKRzJ6l3MBZ98J7ygFcR9UdOosCELlPxCzHHpMtC8i/TUK/TDpyCf6NA39qhAjSRl5uLIqH5/gEGOJJTtLn44IvlGxJ9X80JSs/b1Ix15jbhoklTdtPRrWF6ZdtK P6Q== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 12/04/22 at 11:47am, kernel test robot wrote: > Hi Baoquan, > > I love your patch! Perhaps something to improve: > > [auto build test WARNING on akpm-mm/mm-everything] > > url: https://github.com/intel-lab-lkp/linux/commits/Baoquan-He/mm-vmalloc-c-allow-vread-to-read-out-vm_map_ram-areas/20221204-093322 > base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything > patch link: https://lore.kernel.org/r/20221204013046.154960-4-bhe%40redhat.com > patch subject: [PATCH v1 3/7] mm/vmalloc.c: allow vread() to read out vm_map_ram areas > config: arm-randconfig-r046-20221204 > compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0 > reproduce (this is a W=1 build): > wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross > chmod +x ~/bin/make.cross > # https://github.com/intel-lab-lkp/linux/commit/0bcc4ce1e46418b86eb569175879081116649727 > git remote add linux-review https://github.com/intel-lab-lkp/linux > git fetch --no-tags linux-review Baoquan-He/mm-vmalloc-c-allow-vread-to-read-out-vm_map_ram-areas/20221204-093322 > git checkout 0bcc4ce1e46418b86eb569175879081116649727 > # save the config file > mkdir build_dir && cp config build_dir/.config > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash > > If you fix the issue, kindly add following tag where applicable > | Reported-by: kernel test robot > > All warnings (new ones prefixed by >>): > > mm/vmalloc.c: In function 'vb_vread': > >> mm/vmalloc.c:3540:23: warning: variable 'offset' set but not used [-Wunused-but-set-variable] > 3540 | unsigned long offset; > | ^~~~~~ Thanks. The local variable 'offset' is needed, the handling in vb_vread() need be improved to cover the case in which reading is started from dirty or free regions. I will add below change to v2. diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 78cae59170d8..6612914459cf 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -3526,7 +3522,6 @@ static void vb_vread(char *buf, char *addr, int count) unsigned long offset; unsigned int rs, re, n; - offset = ((unsigned long)addr & (VMAP_BLOCK_SIZE - 1)) >> PAGE_SHIFT; vb = xa_load(&vmap_blocks, addr_to_vb_idx((unsigned long)addr)); spin_lock(&vb->lock); @@ -3547,16 +3542,22 @@ static void vb_vread(char *buf, char *addr, int count) addr++; count--; } - n = (re - rs + 1) << PAGE_SHIFT; + /*it could start reading from the middle of used region*/ + offset = offset_in_page(addr); + n = (re - rs + 1) << PAGE_SHIFT - offset; if (n > count) n = count; - aligned_vread(buf, start, n); + aligned_vread(buf, start+offset, n); buf += n; addr += n; count -= n; } spin_unlock(&vb->lock); + + /* zero-fill the left dirty or free regions */ + if (count) + memset(buf, 0, count); } /**