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7a40c3cd-7659-475c-87f1-08dcd7f157bc X-MS-Exchange-CrossTenant-AuthSource: IA1PR10MB7447.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Sep 2024 14:51:14.0077 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 1MJyOVxlViJRqal7wyjZl2Nrhdva++nuv3uq0IMuLNL8h8tzVZ/OQ/axRXN7sMkSuXgtvOalBb9jsSAZD/tqNBSmwuU5cX+a4ZHo0MtESuo= X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR10MB5672 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-18_10,2024-09-18_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 bulkscore=0 adultscore=0 suspectscore=0 mlxlogscore=999 phishscore=0 malwarescore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2408220000 definitions=main-2409180096 X-Proofpoint-GUID: Dd0-l9XPMaaCWzPJ3IrzqPPHUmSTlndG X-Proofpoint-ORIG-GUID: Dd0-l9XPMaaCWzPJ3IrzqPPHUmSTlndG On 9/15/2024 4:37 PM, Jason Gunthorpe wrote: > On Sat, Sep 14, 2024 at 06:05:50AM -0700, Steve Sistare wrote: >> diff --git a/mm/gup.c b/mm/gup.c >> index 947881ff..f8f3f2a 100644 >> --- a/mm/gup.c >> +++ b/mm/gup.c >> @@ -3720,3 +3720,21 @@ long memfd_pin_folios(struct file *memfd, loff_t start, loff_t end, >> return ret; >> } >> EXPORT_SYMBOL_GPL(memfd_pin_folios); >> + >> +/** >> + * repin_folio_unhugely() - repin a folio at small page granularity >> + * @folio: the folio to repin >> + * @npin: the number of pages pinned in the folio >> + * >> + * Given a huge page folio that is already pinned, and the number of small >> + * pages that are pinned in it, adjust the pincount to reflect small-page >> + * granularity. Each small page can later be unpinned individually. >> + */ > > I think the language choice here is probably not entirely consistent > with the rest of the code Yes, a good name was not obvious to me, to I submitted a slightly flippant name to generate some discussion :) > > Maybe > > folio_split_user_page_pin(folio, npages) > @npages: The new number of pages the folio pin reference should hold > > Given a high order folio that is already pinned adjust the reference > count to allow unpin_user_page_range() and related to be called on a > the folio. npages is the number of pages that will be passed to a > future unpin_user_page_range(). > > Which anchors it in the purpose a little more Thanks, I will use this if no one objects. - Steve > The implementation looked OK to me > > Jason