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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Jun 2025 03:35:01.4387 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 5e05aec6-f0fd-4cfe-c923-08ddb7871875 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: AMS1EPF0000004D.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR08MB9717 X-Stat-Signature: wfs95nxck3xhrr8jcnw9m4yb1jm8xat5 X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 651D780004 X-Rspam-User: X-HE-Tag: 1751254507-414832 X-HE-Meta: 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 OeBJQksV FUsMNG4pc/GvKf/p4lRKJq0eikzoplSXZ+0/xO9RTLqtFiV6awSpFru6n5jNSwG5tcHGlSHlzZ2zVCZo= 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: List-Subscribe: List-Unsubscribe: On 29/06/25 2:30 am, David Hildenbrand wrote: > On 28.06.25 05:37, Dev Jain wrote: >> >> On 27/06/25 5:25 pm, David Hildenbrand wrote: >>> Honoring these PTE bits is the exception, so let's invert the meaning. >>> >>> With this change, most callers don't have to pass any flags. >>> >>> No functional change intended. >> >> FWIW I had proposed this kind of change earlier to Ryan (CCed) and >> he pointed out: "Doesn't that argument apply in reverse if you want >> to ignore something new in future? >> >> By default we are comparing all the bits in the pte when determining >> the batch. >> The flags request to ignore certain bits. > > That statement is not true: as default we ignore the write and young > bit. And we don't have flags for that ;) > > Now we also ignore the dirty and soft-dity bit as default, unless told > not to do that by one very specific caller. > >> If we want to ignore extra bits in >> future, we add new flags and the existing callers don't need to be >> updated. > > What stops you from using FPB_IGNORE_* for something else in the future? > > As a side note, there are not that many relevant PTE bits to worry > about in the near future ;) > > I mean, uffd-wp, sure, ... and before we add a FPB_HONOR_UFFD_WP to > all users to be safe (and changing the default to ignore), you could > add a FPB_IGNORE_UFFD_WP first, to then check who really can tolerate > just ignoring it (most of them, I assume). I agree.