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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: Y1Ht8cnQEr0WDPMpQxxrM1R4ha7eqpG2mEr76DD8r/Q1pEiMfO8mlA3oWeGHEt1DDlbAxOKj7QS0wiBkNxUbl/iaQ4+4rFmg52jTRbwgl29SeAqdhui7HsolOT8pc3mEopWfJRN6c0DGxREhdO9fPirdh13+B6Zn+V2/tZFBz1h3afS/Z9RDjP6CvDeZbDO4jdUuhlZL8pOdqpCZvbMZy/2bk4+DExRgd4qo/dccK+TPfrlJBx4oLTo9XM7zYjTJ0fwC2ukXp/O1ThGTbwZtfsdcA8czZoFGMdBtkDlwoU7jZsqCNn9SQ++2iPbDP3hP2ZxJ/DpNUrcZH+GThf9rhhWVd9wRrCJYIX2OkD/Vcy5UrkZ2l8Q1aXiJyYK1NOOxiqLnmzQWyqWpGFj1Pbo/X9Fx9qOZ6enqPIj3J3gDS8CRkH4KZW3Tvfggz6bcWsj5 X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Nov 2026 14:30:43.5121 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: a06b969d-b38f-4874-44f0-08df3c128a42 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: CPH1EPF00000524.eurprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI0PR08MB11709 Hi, On 2026. 11. 06. 15:13, Jan Kara wrote: > Hi! > > On Fri 06-11-26 10:31:58, Bence Csókás wrote: >> On 2026. 11. 06. 10:05, Christian Brauner wrote: >>> On Tue, Oct 27, 2026 at 05:22:00PM +0100, Bence Csokas wrote: >>>> Add __free() support to eventfd and update drm_syncobj to use it as an >>>> example consumer. >>>> >>>> A minor discrepancy I encountered is whether to put a semicolon after >>>> DEFINE_FREE(). It seems some in-tree code does, some doesn't. In the end, >>>> I followed the example set in core-api/cleanup.rst, and omitted it. >>>> >>>> Signed-off-by: Bence Csokas >>>> --- >>> >>> I'm really having trouble seeing how this improves anything >>> significantly. Probably others have the same impression which is why >>> this doesn't get a lot of review. >> >> The goal of the __free() API is to reduce the number of goto-based error >> paths. Normally, you'd have to keep the state of every local in your head >> for every early return. (Has it been initialized? Has it been consumed? Or >> does it need to be freed?) Then you need to arrange your "goto tree" (error >> labels) in a way that frees everything, and then for every early exit, jump >> to the correct one. This can be quite complex for some functions. Look at >> KVM or HyperV eventfd code, for example. >> >> By contrast, you just mark the local var with _free() and an appropriate >> destructor snippet, and the consumption point (the point after which we >> don't need to free it on a return) with no_free_ptr(), and the compiler >> instruments every early return accordingly. > > Sure, but there's also the other side about which you don't speak: unless > the destructor is trivial (like kfree()), there are implications about > locking, when resources (such as references held by the object) get > released etc. So it can also be more complex to wrap your head around > __free usage than around standard cleanup code. Sure. Thankfully eventfd_ctx_put() is one of the pretty trivial ones, basically just calling kfree() on itself when the kref drops to 0. > So unless __free is providing a noticeable simplification of some goto > hell, cleanup in many functions or similar, I generally don't find it worth > it... > > Honza Look into for instance mshv_irqfd_assign() and weep... And then imagine how much simpler it'd be if it were using __free() instead. For the example in 2/2, I deliberately chose one callsite where it's trivial to deduce that behaviour is unchanged. Bence