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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/parisc/README.dino | |
| 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/parisc/README.dino')
| -rw-r--r-- | drivers/parisc/README.dino | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/parisc/README.dino b/drivers/parisc/README.dino new file mode 100644 index 000000000..162742699 --- /dev/null +++ b/drivers/parisc/README.dino @@ -0,0 +1,27 @@ +/* +** HP VISUALIZE Workstation PCI Bus Defect +** +** "HP has discovered a potential system defect that can affect +** the behavior of five models of HP VISUALIZE workstations when +** equipped with third-party or customer-installed PCI I/O expansion +** cards. The defect is limited to the HP C180, C160, C160L, B160L, +** and B132L VISUALIZE workstations, and will only be encountered +** when data is transmitted through PCI I/O expansion cards on the +** PCI bus. HP-supplied graphics cards that utilize the PCI bus are +** not affected." +** +** http://h20000.www2.hp.com/bizsupport/TechSupport/Home.jsp?locale=en_US&prodTypeId=12454&prodSeriesId=44443 +** +** Product First Good Serial Number +** C200/C240 (US) US67350000 +**B132L+/B180 (US) US67390000 +** C200 (Europe) 3713G01000 +** B180L (Europe) 3720G01000 +** +** Note that many boards were fixed/replaced under a free replacement +** program. Assume a machine is only "suspect" until proven otherwise. +** +** "The pci_check program will also be available as application +** patch PHSS_12295" +*/ + |