github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-25 15:41:52 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

riscv: Require clang-17 or newer for kCFI

Browse Source 
After the combination of commit c217157bcd ("riscv: Implement
HAVE_DYNAMIC_FTRACE_WITH_CALL_OPS"), which starts using
'-fpatchable-function-entry=M,N', and commit d0262e907e ("riscv:
ftrace: support PREEMPT"), which allows CONFIG_DYNAMIC_FTRACE to be
enabled by allmodconfig, allmodconfig builds with clang-16 begin
crashing in the generic LLVM kCFI pass (see [1] for the stack trace).

clang-17 avoids this crash by moving to target-specific lowering of the
kCFI operand bundles [2]. Require clang-17 to select CONFIG_CFI_CLANG to
avoid this crash.

Fixes: c217157bcd ("riscv: Implement HAVE_DYNAMIC_FTRACE_WITH_CALL_OPS")
Link: https://godbolt.org/z/xG39Pn16o [1]
Link: 62fa708ceb [2]
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Link: https://lore.kernel.org/r/20250612-riscv-require-clang-17-for-kcfi-v1-1-216f7cd7d87f@kernel.org
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
This commit is contained in:
Nathan Chancellor 2025-06-12 12:57:01 -07:00 committed by Alexandre Ghiti
parent d0b3b7b22d
commit 6f49743af4
1 changed files with 2 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/riscv/Kconfig
View File

@ -63,7 +63,8 @@ config RISCV
select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
select ARCH_STACKWALK
select ARCH_SUPPORTS_ATOMIC_RMW
select ARCH_SUPPORTS_CFI_CLANG
# clang >= 17: https://github.com/llvm/llvm-project/commit/62fa708ceb027713b386c7e0efda994f8bdc27e2
select ARCH_SUPPORTS_CFI_CLANG if CLANG_VERSION >= 170000
select ARCH_SUPPORTS_DEBUG_PAGEALLOC if MMU
select ARCH_SUPPORTS_HUGE_PFNMAP if TRANSPARENT_HUGEPAGE
select ARCH_SUPPORTS_HUGETLBFS if MMU