[{"id":3679700,"web_url":"http://patchwork.ozlabs.org/comment/3679700/","msgid":"","list_archive_url":null,"date":"2026-04-21T07:07:47","subject":"Re: [PATCH v2 1/5] rust: add warn_on_err macro","submitter":{"id":93201,"url":"http://patchwork.ozlabs.org/api/people/93201/","name":"Eliot Courtney","email":"ecourtney@nvidia.com"},"content":"On Tue Apr 21, 2026 at 3:16 PM JST, Alexandre Courbot wrote:\n> While we already have the `warn_on` macro, a common usage pattern in\n> Rust is to check whether a `Result` is an error. Add a helper macro that\n> allows this.\n>\n> Signed-off-by: Alexandre Courbot \n> ---\n> rust/kernel/bug.rs | 10 ++++++++++\n> 1 file changed, 10 insertions(+)\n>\n> diff --git a/rust/kernel/bug.rs b/rust/kernel/bug.rs\n> index ed943960f851..2fefc0aeef81 100644\n> --- a/rust/kernel/bug.rs\n> +++ b/rust/kernel/bug.rs\n> @@ -130,3 +130,13 @@ macro_rules! warn_on {\n> cond\n> }};\n> }\n> +\n> +/// Report a warning if `res` is an error and return it unmodified.\n\nnit: \"it\" -> \"the [`Result`] `res`\" since it somewhat reads like it's\nreturning the error\n\nReviewed-by: Eliot Courtney \n\n\n> +#[macro_export]\n> +macro_rules! warn_on_err {\n> + ($res:expr) => {{\n> + let res = $res;\n> + let _ = $crate::warn_on!(res.is_err());\n> + res\n> + }};\n> +}","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-pci@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit 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Alexandre Courbot wrote:\n> While we already have the `warn_on` macro, a common usage pattern in\n> Rust is to check whether a `Result` is an error. Add a helper macro that\n> allows this.\n>\n> Signed-off-by: Alexandre Courbot \n> ---\n> rust/kernel/bug.rs | 10 ++++++++++\n> 1 file changed, 10 insertions(+)\n>\n> diff --git a/rust/kernel/bug.rs b/rust/kernel/bug.rs\n> index ed943960f851..2fefc0aeef81 100644\n> --- a/rust/kernel/bug.rs\n> +++ b/rust/kernel/bug.rs\n> @@ -130,3 +130,13 @@ macro_rules! warn_on {\n> cond\n> }};\n> }\n> +\n> +/// Report a warning if `res` is an error and return it unmodified.\n> +#[macro_export]\n> +macro_rules! warn_on_err {\n> + ($res:expr) => {{\n> + let res = $res;\n> + let _ = $crate::warn_on!(res.is_err());\n> + res\n> + }};\n> +}\n\n\nI think `warn_on_err` could just be expressed as\n\n res.inspect_err(|_| warn_on!(true))\n\nBest,\nGary","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-pci@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) 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