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dff64b0727
Add warn_on macro, uses the BUG/WARN feature (lib/bug.c) via assembly for x86_64/arm64/riscv. The current Rust code simply wraps BUG() macro but doesn't provide the proper debug information. The BUG/WARN feature can only be used from assembly. This uses the assembly code exported by the C side via ARCH_WARN_ASM macro. To avoid duplicating the assembly code, this approach follows the same strategy as the static branch code: it generates the assembly code for Rust using the C preprocessor at compile time. Similarly, ARCH_WARN_REACHABLE is also used at compile time to generate the assembly code; objtool's reachable annotation code. It's used for only architectures that use objtool. For now, Loongarch and arm just use a wrapper for WARN macro. UML doesn't use the assembly BUG/WARN feature; just wrapping generic BUG/WARN functions implemented in C works. Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com> Reviewed-by: Alice Ryhl <aliceryhl@google.com> Link: https://lore.kernel.org/r/20250502094537.231725-5-fujita.tomonori@gmail.com [ Avoid evaluating the condition twice (a good idea in general, but it also matches the C side). Simplify with `as_char_ptr()` to avoid a cast. Cast to `ffi` integer types for `warn_slowpath_fmt`. Avoid cast for `null()`. - Miguel ] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
7 lines
126 B
ArmAsm
7 lines
126 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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#include <linux/bug.h>
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// Cut here.
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::kernel::concat_literals!(ARCH_WARN_REACHABLE)
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