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b=SAa8i3Hetvqzjzka6bU0gYRpZcqrcP3lLvZWA/VbQLVtAeApu/b2pFpu5w4H3t2Cuq/UH8FChJDIG/xEvTrDvPGihJHMYoyGUVm6qNTGLwZLUS7mqd57dTNCOOtWEgMUOW0Dp75REnDinK6+JZMhyeEXpZkK/E7cdM+80z8UTMA= Received: from LO2P265MB5183.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:253::10) by CWXP265MB3240.GBRP265.PROD.OUTLOOK.COM (2603:10a6:400:b2::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8005.25; Sat, 28 Sep 2024 19:37:40 +0000 Received: from LO2P265MB5183.GBRP265.PROD.OUTLOOK.COM ([fe80::1818:a2bf:38a7:a1e7]) by LO2P265MB5183.GBRP265.PROD.OUTLOOK.COM ([fe80::1818:a2bf:38a7:a1e7%3]) with mapi id 15.20.8005.024; Sat, 28 Sep 2024 19:37:40 +0000 Date: Sat, 28 Sep 2024 20:37:10 +0100 From: Gary Guo To: Danilo Krummrich Cc: ojeda@kernel.org, alex.gaynor@gmail.com, wedsonaf@gmail.com, boqun.feng@gmail.com, bjorn3_gh@protonmail.com, benno.lossin@proton.me, a.hindborg@samsung.com, aliceryhl@google.com, akpm@linux-foundation.org, daniel.almeida@collabora.com, faith.ekstrand@collabora.com, boris.brezillon@collabora.com, lina@asahilina.net, mcanal@igalia.com, zhiw@nvidia.com, cjia@nvidia.com, jhubbard@nvidia.com, airlied@redhat.com, ajanulgu@redhat.com, lyude@redhat.com, linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH v7 23/26] rust: str: test: replace `alloc::format` Message-ID: <20240928203710.40bbb24d.gary@garyguo.net> In-Reply-To: <20240911225449.152928-24-dakr@kernel.org> References: <20240911225449.152928-1-dakr@kernel.org> <20240911225449.152928-24-dakr@kernel.org> X-Mailer: Claws Mail 4.2.0 (GTK 3.24.43; 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Instead, implement `format!` for `CString`. > > Note that for userspace tests, `Kmalloc`, which is backing `CString`'s > memory, is just a type alias to `Cmalloc`. > > Reviewed-by: Alice Ryhl > Reviewed-by: Benno Lossin > Signed-off-by: Danilo Krummrich Reviewed-by: Gary Guo > --- > rust/kernel/str.rs | 23 ++++++++++++++++++++++- > 1 file changed, 22 insertions(+), 1 deletion(-) > > diff --git a/rust/kernel/str.rs b/rust/kernel/str.rs > index 209ad1bb1a49..726329530338 100644 > --- a/rust/kernel/str.rs > +++ b/rust/kernel/str.rs > @@ -523,7 +523,28 @@ macro_rules! c_str { > #[cfg(test)] > mod tests { > use super::*; > - use alloc::format; > + > + struct String(CString); > + > + impl String { > + fn from_fmt(args: fmt::Arguments<'_>) -> Self { > + String(CString::try_from_fmt(args).unwrap()) > + } > + } > + > + impl Deref for String { > + type Target = str; > + > + fn deref(&self) -> &str { > + self.0.to_str().unwrap() > + } > + } > + > + macro_rules! format { > + ($($f:tt)*) => ({ > + &*String::from_fmt(kernel::fmt!($($f)*)) > + }) > + } > > const ALL_ASCII_CHARS: &'static str = > "\\x01\\x02\\x03\\x04\\x05\\x06\\x07\\x08\\x09\\x0a\\x0b\\x0c\\x0d\\x0e\\x0f\