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Peter Anvin" , x86@kernel.org, Liran Alon , Nikita Leshenko , Barret Rhoden , Boris Ostrovsky , Matthew Wilcox , Konrad Rzeszutek Wilk Subject: [PATCH RFC 06/10] device-dax: Introduce pfn_flags helper Date: Fri, 10 Jan 2020 19:03:09 +0000 Message-Id: <20200110190313.17144-7-joao.m.martins@oracle.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20200110190313.17144-1-joao.m.martins@oracle.com> References: <20200110190313.17144-1-joao.m.martins@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9496 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=1 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=800 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1911140001 definitions=main-2001100154 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9496 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=865 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1911140001 definitions=main-2001100154 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Replace PFN_DEV|PFN_MAP check call sites with two helper functions dax_is_pfn_dev() and dax_is_pfn_map(). Signed-off-by: Joao Martins --- drivers/dax/device.c | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-) diff --git a/drivers/dax/device.c b/drivers/dax/device.c index c6a7f5e12c54..113a554de3ee 100644 --- a/drivers/dax/device.c +++ b/drivers/dax/device.c @@ -14,6 +14,17 @@ #include "dax-private.h" #include "bus.h" +static int dax_is_pfn_dev(struct dev_dax *dev_dax) +{ + return (dev_dax->region->pfn_flags & (PFN_DEV|PFN_MAP)) == PFN_DEV; +} + +static int dax_is_pfn_map(struct dev_dax *dev_dax) +{ + return (dev_dax->region->pfn_flags & + (PFN_DEV|PFN_MAP)) == (PFN_DEV|PFN_MAP); +} + static int check_vma_mmap(struct dev_dax *dev_dax, struct vm_area_struct *vma, const char *func) { @@ -60,8 +71,7 @@ static int check_vma(struct dev_dax *dev_dax, struct vm_area_struct *vma, if (rc < 0) return rc; - if ((dev_dax->region->pfn_flags & (PFN_DEV|PFN_MAP)) == PFN_DEV - && (vma->vm_flags & VM_DONTCOPY) == 0) { + if (dax_is_pfn_dev(dev_dax) && (vma->vm_flags & VM_DONTCOPY) == 0) { dev_info_ratelimited(&dev_dax->dev, "%s: %s: fail, dax range requires MADV_DONTFORK\n", current->comm, func); @@ -140,7 +150,7 @@ static vm_fault_t __dev_dax_pmd_fault(struct dev_dax *dev_dax, } /* dax pmd mappings require pfn_t_devmap() */ - if ((dax_region->pfn_flags & (PFN_DEV|PFN_MAP)) != (PFN_DEV|PFN_MAP)) { + if (!dax_is_pfn_map(dev_dax)) { dev_dbg(dev, "region lacks devmap flags\n"); return VM_FAULT_SIGBUS; } @@ -190,7 +200,7 @@ static vm_fault_t __dev_dax_pud_fault(struct dev_dax *dev_dax, } /* dax pud mappings require pfn_t_devmap() */ - if ((dax_region->pfn_flags & (PFN_DEV|PFN_MAP)) != (PFN_DEV|PFN_MAP)) { + if (!dax_is_pfn_map(dev_dax)) { dev_dbg(dev, "region lacks devmap flags\n"); return VM_FAULT_SIGBUS; }