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| author | Miguel Ojeda <ojeda@kernel.org> | 2026-08-16 15:32:33 +0200 |
|---|---|---|
| committer | Miguel Ojeda <ojeda@kernel.org> | 2026-08-23 21:27:17 +0200 |
| commit | 5febf432df1cfa5b25d99b54c32103fafbdd0eb9 (patch) | |
| tree | 93a1ed1d337bc53adf1e572c2586d347703b286e /drivers/clk/sprd/Kconfig | |
| download | linux-stable-5febf432df1cfa5b25d99b54c32103fafbdd0eb9.tar.gz linux-stable-5febf432df1cfa5b25d99b54c32103fafbdd0eb9.zip | |
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>
Diffstat (limited to 'drivers/clk/sprd/Kconfig')
| -rw-r--r-- | drivers/clk/sprd/Kconfig | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/clk/sprd/Kconfig b/drivers/clk/sprd/Kconfig new file mode 100644 index 000000000..2f19c8d58 --- /dev/null +++ b/drivers/clk/sprd/Kconfig @@ -0,0 +1,32 @@ +# SPDX-License-Identifier: GPL-2.0-only +config SPRD_COMMON_CLK + tristate "Clock support for Spreadtrum SoCs" + depends on ARCH_SPRD || COMPILE_TEST + default ARCH_SPRD + select REGMAP_MMIO + +if SPRD_COMMON_CLK + +# SoC Drivers + +config SPRD_SC9860_CLK + tristate "Support for the Spreadtrum SC9860 clocks" + depends on (ARM64 && ARCH_SPRD) || COMPILE_TEST + default ARM64 && ARCH_SPRD + +config SPRD_SC9863A_CLK + tristate "Support for the Spreadtrum SC9863A clocks" + depends on (ARM64 && ARCH_SPRD) || COMPILE_TEST + default ARM64 && ARCH_SPRD + help + Support for the global clock controller on sc9863a devices. + Say Y if you want to use peripheral devices on sc9863a SoC. + +config SPRD_UMS512_CLK + tristate "Support for the Spreadtrum UMS512 clocks" + depends on (ARM64 && ARCH_SPRD) || COMPILE_TEST + default ARM64 && ARCH_SPRD + help + Support for the global clock controller on ums512 devices. + Say Y if you want to use peripheral devices on ums512 SoC. +endif |