Rust fixes for v6.11

- Fix '-Os' Rust 1.80.0+ builds adding more intrinsics (also tweaked
    in upstream Rust for the upcoming 1.82.0).
 
  - Fix support for the latest version of rust-analyzer due to a change
    on rust-analyzer config file semantics (considered a fix since most
    developers use the latest version of the tool, which is the only one
    actually supported by upstream). I am discussing stability of the
    config file with upstream -- they may be able to start versioning it.
 
  - Fix GCC 14 builds due to '-fmin-function-alignment' not skipped for
    libclang (bindgen).
 
  - A couple Kconfig fixes around '{RUSTC,BINDGEN}_VERSION_TEXT' to
    suppress error messages in a foreign architecture chroot and to use a
    proper default format.
 
  - Clean 'rust-analyzer' target warning due to missing recursive make
    invocation mark.
 
  - Clean Clippy warning due to missing indentation in docs.
 
  - Clean LLVM 19 build warning due to removed 3dnow feature upstream.
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Merge tag 'rust-fixes-6.11' of https://github.com/Rust-for-Linux/linux

Pull rust fixes from Miguel Ojeda:

 - Fix '-Os' Rust 1.80.0+ builds adding more intrinsics (also tweaked in
   upstream Rust for the upcoming 1.82.0).

 - Fix support for the latest version of rust-analyzer due to a change
   on rust-analyzer config file semantics (considered a fix since most
   developers use the latest version of the tool, which is the only one
   actually supported by upstream). I am discussing stability of the
   config file with upstream -- they may be able to start versioning it.

 - Fix GCC 14 builds due to '-fmin-function-alignment' not skipped for
   libclang (bindgen).

 - A couple Kconfig fixes around '{RUSTC,BINDGEN}_VERSION_TEXT' to
   suppress error messages in a foreign architecture chroot and to use a
   proper default format.

 - Clean 'rust-analyzer' target warning due to missing recursive make
   invocation mark.

 - Clean Clippy warning due to missing indentation in docs.

 - Clean LLVM 19 build warning due to removed 3dnow feature upstream.

* tag 'rust-fixes-6.11' of https://github.com/Rust-for-Linux/linux:
  rust: x86: remove `-3dnow{,a}` from target features
  kbuild: rust-analyzer: mark `rust_is_available.sh` invocation as recursive
  rust: add intrinsics to fix `-Os` builds
  kbuild: rust: skip -fmin-function-alignment in bindgen flags
  rust: Support latest version of `rust-analyzer`
  rust: macros: indent list item in `module!`'s docs
  rust: fix the default format for CONFIG_{RUSTC,BINDGEN}_VERSION_TEXT
  rust: suppress error messages from CONFIG_{RUSTC,BINDGEN}_VERSION_TEXT

Makefile

@@ -1963,7 +1963,7 @@ tags TAGS cscope gtags: FORCE
 # Protocol).
 PHONY += rust-analyzer
 rust-analyzer:
-	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh
+	+$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh
 	$(Q)$(MAKE) $(build)=rust $@
 
 # Script to generate missing namespace dependencies

init/Kconfig

@@ -1920,7 +1920,7 @@ config RUST
 config RUSTC_VERSION_TEXT
 	string
 	depends on RUST
-	default $(shell,command -v $(RUSTC) >/dev/null 2>&1 && $(RUSTC) --version || echo n)
+	default "$(shell,$(RUSTC) --version 2>/dev/null)"
 
 config BINDGEN_VERSION_TEXT
 	string
@@ -1928,7 +1928,7 @@ config BINDGEN_VERSION_TEXT
 	# The dummy parameter `workaround-for-0.69.0` is required to support 0.69.0
 	# (https://github.com/rust-lang/rust-bindgen/pull/2678). It can be removed when
 	# the minimum version is upgraded past that (0.69.1 already fixed the issue).
-	default $(shell,command -v $(BINDGEN) >/dev/null 2>&1 && $(BINDGEN) --version workaround-for-0.69.0 || echo n)
+	default "$(shell,$(BINDGEN) --version workaround-for-0.69.0 2>/dev/null)"
 
 #
 # Place an empty function call at each tracepoint site. Can be

rust/Makefile

@@ -227,7 +227,7 @@ bindgen_skip_c_flags := -mno-fp-ret-in-387 -mpreferred-stack-boundary=% \
 	-fno-reorder-blocks -fno-allow-store-data-races -fasan-shadow-offset=% \
 	-fzero-call-used-regs=% -fno-stack-clash-protection \
 	-fno-inline-functions-called-once -fsanitize=bounds-strict \
-	-fstrict-flex-arrays=% \
+	-fstrict-flex-arrays=% -fmin-function-alignment=% \
 	--param=% --param asan-%
 
 # Derived from `scripts/Makefile.clang`.
@@ -350,12 +350,12 @@ rust-analyzer:
 	$(Q)$(srctree)/scripts/generate_rust_analyzer.py \
 		--cfgs='core=$(core-cfgs)' --cfgs='alloc=$(alloc-cfgs)' \
 		$(realpath $(srctree)) $(realpath $(objtree)) \
-		$(RUST_LIB_SRC) $(KBUILD_EXTMOD) > \
+		$(rustc_sysroot) $(RUST_LIB_SRC) $(KBUILD_EXTMOD) > \
 		$(if $(KBUILD_EXTMOD),$(extmod_prefix),$(objtree))/rust-project.json
 
 redirect-intrinsics = \
-	__addsf3 __eqsf2 __gesf2 __lesf2 __ltsf2 __mulsf3 __nesf2 __unordsf2 \
-	__adddf3 __ledf2 __ltdf2 __muldf3 __unorddf2 \
+	__addsf3 __eqsf2 __extendsfdf2 __gesf2 __lesf2 __ltsf2 __mulsf3 __nesf2 __truncdfsf2 __unordsf2 \
+	__adddf3 __eqdf2 __ledf2 __ltdf2 __muldf3 __unorddf2 \
 	__muloti4 __multi3 \
 	__udivmodti4 __udivti3 __umodti3
 

rust/compiler_builtins.rs

@@ -40,16 +40,19 @@ macro_rules! define_panicking_intrinsics(
 define_panicking_intrinsics!("`f32` should not be used", {
     __addsf3,
     __eqsf2,
+    __extendsfdf2,
     __gesf2,
     __lesf2,
     __ltsf2,
     __mulsf3,
     __nesf2,
+    __truncdfsf2,
     __unordsf2,
 });
 
 define_panicking_intrinsics!("`f64` should not be used", {
     __adddf3,
+    __eqdf2,
     __ledf2,
     __ltdf2,
     __muldf3,

scripts/generate_rust_analyzer.py

@@ -145,6 +145,7 @@ def main():
     parser.add_argument('--cfgs', action='append', default=[])
     parser.add_argument("srctree", type=pathlib.Path)
     parser.add_argument("objtree", type=pathlib.Path)
+    parser.add_argument("sysroot", type=pathlib.Path)
     parser.add_argument("sysroot_src", type=pathlib.Path)
     parser.add_argument("exttree", type=pathlib.Path, nargs="?")
     args = parser.parse_args()
@@ -154,9 +155,12 @@ def main():
         level=logging.INFO if args.verbose else logging.WARNING
     )
 
+    # Making sure that the `sysroot` and `sysroot_src` belong to the same toolchain.
+    assert args.sysroot in args.sysroot_src.parents
+
     rust_project = {
         "crates": generate_crates(args.srctree, args.objtree, args.sysroot_src, args.exttree, args.cfgs),
-        "sysroot_src": str(args.sysroot_src),
+        "sysroot": str(args.sysroot),
     }
 
     json.dump(rust_project, sys.stdout, sort_keys=True, indent=4)

scripts/generate_rust_target.rs

@@ -162,7 +162,7 @@ fn main() {
             "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",
         );
-        let mut features = "-3dnow,-3dnowa,-mmx,+soft-float".to_string();
+        let mut features = "-mmx,+soft-float".to_string();
         if cfg.has("MITIGATION_RETPOLINE") {
             features += ",+retpoline-external-thunk";
         }
@@ -179,7 +179,7 @@ fn main() {
             "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",
         );
-        let mut features = "-3dnow,-3dnowa,-mmx,+soft-float".to_string();
+        let mut features = "-mmx,+soft-float".to_string();
         if cfg.has("MITIGATION_RETPOLINE") {
             features += ",+retpoline-external-thunk";
         }