diff options
| author | FUJITA Tomonori <fujita.tomonori@gmail.com> | 2025-05-02 18:45:36 +0900 |
|---|---|---|
| committer | Miguel Ojeda <ojeda@kernel.org> | 2025-07-23 02:05:58 +0200 |
| commit | dff64b072708ffef23c117fa1ee1ea59eb417807 (patch) | |
| tree | 99ed37fa488992927df083ec1bd40243d61339e5 /rust/kernel/generated_arch_warn_asm.rs.S | |
| parent | 826230970a44a50227d4884835ea8a0f8825fe03 (diff) | |
rust: Add warn_on macro
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>
Diffstat (limited to 'rust/kernel/generated_arch_warn_asm.rs.S')
| -rw-r--r-- | rust/kernel/generated_arch_warn_asm.rs.S | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/rust/kernel/generated_arch_warn_asm.rs.S b/rust/kernel/generated_arch_warn_asm.rs.S new file mode 100644 index 000000000000..409eb4c2d3a1 --- /dev/null +++ b/rust/kernel/generated_arch_warn_asm.rs.S @@ -0,0 +1,7 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#include <linux/bug.h> + +// Cut here. + +::kernel::concat_literals!(ARCH_WARN_ASM("{file}", "{line}", "{flags}", "{size}")) |