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Wed, 22 Apr 2020 10:42:56 GMT Received: from b03ledav001.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 99EC96E050; Wed, 22 Apr 2020 10:42:56 +0000 (GMT) Received: from b03ledav001.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id DCFE26E04C; Wed, 22 Apr 2020 10:42:31 +0000 (GMT) Received: from skywalker.linux.ibm.com (unknown [9.79.185.239]) by b03ledav001.gho.boulder.ibm.com (Postfix) with ESMTP; Wed, 22 Apr 2020 10:42:30 +0000 (GMT) X-Mailer: emacs 27.0.91 (via feedmail 11-beta-1 I) From: "Aneesh Kumar K.V" To: Mike Kravetz , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-doc@vger.kernel.org Subject: Re: [PATCH v3 3/4] hugetlbfs: remove hugetlb_add_hstate() warning for existing hstate In-Reply-To: <20200417185049.275845-4-mike.kravetz@oracle.com> References: <20200417185049.275845-1-mike.kravetz@oracle.com> <20200417185049.275845-4-mike.kravetz@oracle.com> Date: Wed, 22 Apr 2020 16:12:26 +0530 Message-ID: <87blnj4x9p.fsf@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138, 18.0.676 definitions=2020-04-22_03:2020-04-22, 2020-04-22 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 lowpriorityscore=0 suspectscore=0 bulkscore=0 mlxlogscore=935 spamscore=0 mlxscore=0 priorityscore=1501 impostorscore=0 malwarescore=0 clxscore=1011 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004220083 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Dave Hansen , Heiko Carstens , Peter Xu , Paul Mackerras , Will Deacon , Mina Almasry , Jonathan Corbet , Christian Borntraeger , Ingo Molnar , Catalin Marinas , Longpeng , Albert Ou , Vasily Gorbik , Paul Walmsley , Thomas Gleixner , Nitesh Narayan Lal , Randy Dunlap , Palmer Dabbelt , Andrew Morton , "David S . Miller" , Mike Kravetz Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Mike Kravetz writes: > The routine hugetlb_add_hstate prints a warning if the hstate already > exists. This was originally done as part of kernel command line > parsing. If 'hugepagesz=' was specified more than once, the warning > pr_warn("hugepagesz= specified twice, ignoring\n"); > would be printed. > > Some architectures want to enable all huge page sizes. They would > call hugetlb_add_hstate for all supported sizes. However, this was > done after command line processing and as a result hstates could have > already been created for some sizes. To make sure no warning were > printed, there would often be code like: > if (!size_to_hstate(size) > hugetlb_add_hstate(ilog2(size) - PAGE_SHIFT) > > The only time we want to print the warning is as the result of command > line processing. Does this patch break hugepages=x command line? I haven't tested this yet. But one of the details w.r.t. skipping that hugetlb_add_hstate is to make sure we can configure the max_huge_pages. >So, remove the warning from hugetlb_add_hstate and > add it to the single arch independent routine processing "hugepagesz=". > After this, calls to size_to_hstate() in arch specific code can be > removed and hugetlb_add_hstate can be called without worrying about > warning messages. > -aneesh