6.13-stable review patch. If anyone has any objections, please let me know.
------------------
From: Alice Ryhl aliceryhl@google.com
commit 6273a058383e05465083b535ed9469f2c8a48321 upstream.
When using Rust on the x86 architecture, we are currently using the unstable target.json feature to specify the compilation target. Rustc is going to change how softfloat is specified in the target.json file on x86, thus update generate_rust_target.rs to specify softfloat using the new option.
Note that if you enable this parameter with a compiler that does not recognize it, then that triggers a warning but it does not break the build.
[ For future reference, this solves the following error:
RUSTC L rust/core.o error: Error loading target specification: target feature `soft-float` is incompatible with the ABI but gets enabled in target spec. Run `rustc --print target-list` for a list of built-in targets
- Miguel ]
Cc: stable@vger.kernel.org # Needed in 6.12.y and 6.13.y only (Rust is pinned in older LTSs). Link: https://github.com/rust-lang/rust/pull/136146 Signed-off-by: Alice Ryhl aliceryhl@google.com Acked-by: Dave Hansen dave.hansen@linux.intel.com # for x86 Link: https://lore.kernel.org/r/20250203-rustc-1-86-x86-softfloat-v1-1-220a72a5003... [ Added 6.13.y too to Cc: stable tag and added reasoning to avoid over-backporting. - Miguel ] Signed-off-by: Miguel Ojeda ojeda@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- scripts/generate_rust_target.rs | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)
--- a/scripts/generate_rust_target.rs +++ b/scripts/generate_rust_target.rs @@ -165,6 +165,18 @@ impl KernelConfig { let option = "CONFIG_".to_owned() + option; self.0.contains_key(&option) } + + /// Is the rustc version at least `major.minor.patch`? + fn rustc_version_atleast(&self, major: u32, minor: u32, patch: u32) -> bool { + let check_version = 100000 * major + 100 * minor + patch; + let actual_version = self + .0 + .get("CONFIG_RUSTC_VERSION") + .unwrap() + .parse::<u32>() + .unwrap(); + check_version <= actual_version + } }
fn main() { @@ -182,6 +194,9 @@ fn main() { } } else if cfg.has("X86_64") { ts.push("arch", "x86_64"); + if cfg.rustc_version_atleast(1, 86, 0) { + ts.push("rustc-abi", "x86-softfloat"); + } ts.push( "data-layout", "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128", @@ -215,6 +230,9 @@ fn main() { panic!("32-bit x86 only works under UML"); } ts.push("arch", "x86"); + if cfg.rustc_version_atleast(1, 86, 0) { + ts.push("rustc-abi", "x86-softfloat"); + } ts.push( "data-layout", "e-m:e-p:32:32-p270:32:32-p271:32:32-p272:64:64-i128:128-f64:32:64-f80:32-n8:16:32-S128",