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Wed, 13 Nov 2019 00:13:22 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.27/8.16.0.27) with SMTP id xACNXexW105277; Wed, 13 Nov 2019 00:11:21 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by userp3020.oracle.com with ESMTP id 2w7vbbtffr-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 13 Nov 2019 00:11:21 +0000 Received: from abhmp0002.oracle.com (abhmp0002.oracle.com [141.146.116.8]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id xAD0BJKR026882; Wed, 13 Nov 2019 00:11:19 GMT Received: from [192.168.1.206] (/71.63.128.209) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 13 Nov 2019 00:11:18 +0000 Subject: Re: [PATCH 2/2] hugetlbfs: convert macros to static inline, fix sparse warning To: Joe Perches , linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Michael Ellerman , Ben Dooks , Jason Gunthorpe , kbuild@lists.01.org, Andrew Morton References: <20191112194558.139389-1-mike.kravetz@oracle.com> <20191112194558.139389-3-mike.kravetz@oracle.com> From: Mike Kravetz Message-ID: <9fcd46c5-aeda-ba08-bebe-bcd61cea13e6@oracle.com> Date: Tue, 12 Nov 2019 16:11:17 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9439 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1910280000 definitions=main-1911120201 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9439 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1910280000 definitions=main-1911120201 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 11/12/19 1:13 PM, Joe Perches wrote: > On Tue, 2019-11-12 at 11:45 -0800, Mike Kravetz wrote: >> huge_pte_offset() produced a sparse warning due to an improper >> return type when the kernel was built with !CONFIG_HUGETLB_PAGE. >> Fix the bad type and also convert all the macros in this block >> to static inline wrappers. Two existing wrappers in this block >> had lines in excess of 80 columns so clean those up as well. >> >> No functional change. >> >> Reported-by: Ben Dooks >> Suggested-by: Jason Gunthorpe >> Signed-off-by: Mike Kravetz >> --- >> include/linux/hugetlb.h | 137 +++++++++++++++++++++++++++++++++------- >> 1 file changed, 115 insertions(+), 22 deletions(-) >> >> diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h >> index 53fc34f930d0..ef412fe0be3d 100644 >> --- a/include/linux/hugetlb.h >> +++ b/include/linux/hugetlb.h >> @@ -164,38 +164,130 @@ static inline void adjust_range_if_pmd_sharing_possible( >> { >> } >> >> -#define follow_hugetlb_page(m,v,p,vs,a,b,i,w,n) ({ BUG(); 0; }) >> -#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL) >> -#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; }) >> +static inline long follow_hugetlb_page(struct mm_struct *mm, >> + struct vm_area_struct *vma, struct page **pages, >> + struct vm_area_struct **vmas, unsigned long *position, >> + unsigned long *nr_pages, long i, unsigned int flags, >> + int *nonblocking) >> +{ >> + BUG(); > > While this is not different from the original, perhaps this is > also an opportunity to change the BUG()s to WARN()s. Yes, I saw all those warnings from checkpatch. I'll add this as a 'to do'. There are a bunch of these in hugetlbfs code and headers. I'd really to take a closer look at all of these and try to do something more intelligent. -- Mike Kravetz