kbuild: rust: keep Rust objects out of Clang LTO with inline helpersgrafted

Under `CONFIG_LTO_CLANG` + `CONFIG_RUST_INLINE_HELPERS`, one may hit
`objtool` errors such as:

    vmlinux.o: error: objtool: _R..._3Gsp4boot+0xd6a:
    can't find jump dest instruction at .text._R..._3Gsp4boot+0x1dfd

The reason is that in such builds, the Clang invocation that compiles
the combined Rust plus helpers bitcode emits LLVM bitcode (again) --
the final code generation happens in the linker's LTO step, which the
`-mllvm` trap options passed to Clang do not reach.

This, in turn, means that unreachable traps are missing, and the
impossible paths do not merely fallthrough to the next symbol, but past
the end of their own section, since LTO builds place each function in
its own section.

Thus filter `CC_FLAGS_LTO` out of the Clang invocation, so that it always
emits machine code directly, with the traps in place.

Assisted-by: LLM
Cc: Gary Guo <gary@garyguo.net>
Cc: Boqun Feng <boqun@kernel.org>
Cc: Alice Ryhl <aliceryhl@google.com>
Cc: Matthew Maurer <mmaurer@google.com>
Cc: Josh Poimboeuf <jpoimboe@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: stable@vger.kernel.org
Fixes: 3a2486cc1da5 ("kbuild: rust: provide an option to inline C helpers into Rust")
Acked-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260816133233.197500-2-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

1 files changed, 45 insertions, 0 deletions

diff --git a/include/scsi/scsi_driver.h b/include/scsi/scsi_driver.h
new file mode 100644
index 000000000..249cea724
--- /dev/null
+++ b/include/scsi/scsi_driver.h
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _SCSI_SCSI_DRIVER_H
+#define _SCSI_SCSI_DRIVER_H
+
+#include <linux/blk_types.h>
+#include <linux/device.h>
+#include <scsi/scsi_cmnd.h>
+
+struct module;
+struct request;
+
+struct scsi_driver {
+	struct device_driver	gendrv;
+
+	int (*probe)(struct scsi_device *);
+	void (*remove)(struct scsi_device *);
+	void (*shutdown)(struct scsi_device *);
+	int (*resume)(struct device *);
+	void (*rescan)(struct device *);
+	blk_status_t (*init_command)(struct scsi_cmnd *);
+	void (*uninit_command)(struct scsi_cmnd *);
+	int (*done)(struct scsi_cmnd *);
+	int (*eh_action)(struct scsi_cmnd *, int);
+	void (*eh_reset)(struct scsi_cmnd *);
+};
+#define to_scsi_driver(drv) \
+	container_of((drv), struct scsi_driver, gendrv)
+
+#define scsi_register_driver(drv) \
+	__scsi_register_driver(drv, THIS_MODULE)
+int __scsi_register_driver(struct scsi_driver *, struct module *);
+#define scsi_unregister_driver(drv) \
+	driver_unregister(&(drv)->gendrv);
+
+extern int scsi_register_interface(struct class_interface *);
+#define scsi_unregister_interface(intf) \
+	class_interface_unregister(intf)
+
+/* make sure not to use it with passthrough commands */
+static inline struct scsi_driver *scsi_cmd_to_driver(struct scsi_cmnd *cmd)
+{
+	return to_scsi_driver(cmd->device->sdev_gendev.driver);
+}
+
+#endif /* _SCSI_SCSI_DRIVER_H */