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Thu, 27 Oct 2022 08:23:06 -0600 Message-ID: Date: Thu, 27 Oct 2022 08:22:57 -0600 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.3.0 Content-Language: en-CA To: Jay Fang , linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, linux-block@vger.kernel.org, linux-pci@vger.kernel.org, linux-mm@kvack.org Cc: Christoph Hellwig , Greg Kroah-Hartman , Dan Williams , Jason Gunthorpe , =?UTF-8?Q?Christian_K=c3=b6nig?= , John Hubbard , Don Dutile , Matthew Wilcox , Daniel Vetter , Minturn Dave B , Jason Ekstrand , Dave Hansen , Xiong Jianxin , Bjorn Helgaas , Ira Weiny , Robin Murphy , Martin Oliveira , Chaitanya Kulkarni , Ralph Campbell , Stephen Bates References: <20221021174116.7200-1-logang@deltatee.com> <20221021174116.7200-4-logang@deltatee.com> From: Logan Gunthorpe In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-SA-Exim-Connect-IP: 24.64.144.200 X-SA-Exim-Rcpt-To: f.fangjian@huawei.com, linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, linux-block@vger.kernel.org, linux-pci@vger.kernel.org, linux-mm@kvack.org, hch@lst.de, gregkh@linuxfoundation.org, dan.j.williams@intel.com, jgg@ziepe.ca, christian.koenig@amd.com, jhubbard@nvidia.com, ddutile@redhat.com, willy@infradead.org, daniel.vetter@ffwll.ch, dave.b.minturn@intel.com, jason@jlekstrand.net, dave.hansen@linux.intel.com, jianxin.xiong@intel.com, helgaas@kernel.org, ira.weiny@intel.com, robin.murphy@arm.com, martin.oliveira@eideticom.com, ckulkarnilinux@gmail.com, rcampbell@nvidia.com, sbates@raithlin.com X-SA-Exim-Mail-From: logang@deltatee.com Subject: Re: [PATCH v11 3/9] iov_iter: introduce iov_iter_get_pages_[alloc_]flags() X-SA-Exim-Version: 4.2.1 (built Sat, 13 Feb 2021 17:57:42 +0000) X-SA-Exim-Scanned: Yes (on ale.deltatee.com) ARC-Seal: i=1; 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dkim=pass header.d=deltatee.com header.s=20200525 header.b=MAQjGDL+; spf=pass (imf06.hostedemail.com: domain of logang@deltatee.com designates 204.191.154.188 as permitted sender) smtp.mailfrom=logang@deltatee.com; dmarc=pass (policy=none) header.from=deltatee.com X-Rspamd-Server: rspam04 X-Stat-Signature: 1phbci6xoipjmogjh441j3d668ye5abc X-HE-Tag: 1666880595-268176 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 2022-10-27 01:11, Jay Fang wrote: > On 2022/10/22 1:41, Logan Gunthorpe wrote: >> Add iov_iter_get_pages_flags() and iov_iter_get_pages_alloc_flags() >> which take a flags argument that is passed to get_user_pages_fast(). >> >> This is so that FOLL_PCI_P2PDMA can be passed when appropriate. >> >> Signed-off-by: Logan Gunthorpe >> Reviewed-by: Christoph Hellwig >> --- >> include/linux/uio.h | 6 ++++++ >> lib/iov_iter.c | 32 ++++++++++++++++++++++++-------- >> 2 files changed, 30 insertions(+), 8 deletions(-) >> >> diff --git a/include/linux/uio.h b/include/linux/uio.h >> index 2e3134b14ffd..9ede533ce64c 100644 >> --- a/include/linux/uio.h >> +++ b/include/linux/uio.h >> @@ -247,8 +247,14 @@ void iov_iter_pipe(struct iov_iter *i, unsigned int direction, struct pipe_inode >> void iov_iter_discard(struct iov_iter *i, unsigned int direction, size_t count); >> void iov_iter_xarray(struct iov_iter *i, unsigned int direction, struct xarray *xarray, >> loff_t start, size_t count); >> +ssize_t iov_iter_get_pages(struct iov_iter *i, struct page **pages, >> + size_t maxsize, unsigned maxpages, size_t *start, >> + unsigned gup_flags); >> ssize_t iov_iter_get_pages2(struct iov_iter *i, struct page **pages, >> size_t maxsize, unsigned maxpages, size_t *start); >> +ssize_t iov_iter_get_pages_alloc(struct iov_iter *i, >> + struct page ***pages, size_t maxsize, size_t *start, >> + unsigned gup_flags); >> ssize_t iov_iter_get_pages_alloc2(struct iov_iter *i, struct page ***pages, >> size_t maxsize, size_t *start); >> int iov_iter_npages(const struct iov_iter *i, int maxpages); >> diff --git a/lib/iov_iter.c b/lib/iov_iter.c >> index c3ca28ca68a6..53efad017f3c 100644 >> --- a/lib/iov_iter.c >> +++ b/lib/iov_iter.c >> @@ -1430,7 +1430,8 @@ static struct page *first_bvec_segment(const struct iov_iter *i, >> >> static ssize_t __iov_iter_get_pages_alloc(struct iov_iter *i, >> struct page ***pages, size_t maxsize, >> - unsigned int maxpages, size_t *start) >> + unsigned int maxpages, size_t *start, >> + unsigned int gup_flags) > > Hi, > found some checkpatch warnings, like this: > WARNING: Prefer 'unsigned int' to bare use of 'unsigned' > #50: FILE: lib/iov_iter.c:1497: > + size_t *start, unsigned gup_flags) We usually stick with the choices of the nearby code instead of the warnings of checkpatch. Thanks, Logan