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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/phy/tegra/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/phy/tegra/Kconfig')
| -rw-r--r-- | drivers/phy/tegra/Kconfig | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/phy/tegra/Kconfig b/drivers/phy/tegra/Kconfig new file mode 100644 index 000000000..f0734415f --- /dev/null +++ b/drivers/phy/tegra/Kconfig @@ -0,0 +1,20 @@ +# SPDX-License-Identifier: GPL-2.0-only +config PHY_TEGRA_XUSB + tristate "NVIDIA Tegra XUSB pad controller driver" + depends on ARCH_TEGRA && USB_SUPPORT + select USB_COMMON + select USB_CONN_GPIO if GPIOLIB + select USB_PHY + help + Choose this option if you have an NVIDIA Tegra SoC. + + To compile this driver as a module, choose M here: the module will + be called phy-tegra-xusb. + +config PHY_TEGRA194_P2U + tristate "NVIDIA Tegra194 PIPE2UPHY PHY driver" + depends on ARCH_TEGRA || COMPILE_TEST + select GENERIC_PHY + help + Enable this to support the P2U (PIPE to UPHY) that is part of Tegra 19x + and 234 SOCs. |