[PATCH V17 5/7] rust: Make __udivdi3() and __umoddi3() panic
From: Mukesh Kumar Chaurasiya (IBM) <hidden>
Date: 2026-07-08 08:26:17
Also in:
lkml, llvm, rust-for-linux
Subsystem:
rust, the rest · Maintainers:
Miguel Ojeda, Linus Torvalds
From: Link Mauve <redacted> The core crate currently depends on these two functions for i64/u64/ i128/u128/core::time::Duration formatting, but we shouldn’t use that in the kernel so let’s panic if they are ever called. This doesn’t yet fix drm_panic_qr.rs, which also uses __udivdi3 when CONFIG_CC_OPTIMIZE_FOR_SIZE=y, but at least makes the rest of the kernel build on PPC32. Signed-off-by: Link Mauve <redacted> Signed-off-by: Mukesh Kumar Chaurasiya (IBM) <redacted> --- rust/Makefile | 4 ++++ rust/compiler_builtins.rs | 6 ++++++ 2 files changed, 10 insertions(+)
diff --git a/rust/Makefile b/rust/Makefile
index 17b2f329c13d..7aa8fcad4c43 100644
--- a/rust/Makefile
+++ b/rust/Makefile@@ -677,6 +677,10 @@ ifneq ($(or $(CONFIG_ARM64),$(and $(CONFIG_RISCV),$(CONFIG_64BIT))),) __ashrti3 \ __ashlti3 __lshrti3 endif +ifdef CONFIG_PPC32 + redirect-intrinsics += \ + __udivdi3 __umoddi3 +endif ifdef CONFIG_MODVERSIONS cmd_gendwarfksyms = $(if $(skip_gendwarfksyms),, \
diff --git a/rust/compiler_builtins.rs b/rust/compiler_builtins.rs
index dd16c1dc899c..fc6b54636dd5 100644
--- a/rust/compiler_builtins.rs
+++ b/rust/compiler_builtins.rs@@ -97,5 +97,11 @@ pub extern "C" fn $ident() { __aeabi_uldivmod, }); +#[cfg(target_arch = "powerpc")] +define_panicking_intrinsics!("`u64` division/modulo should not be used", { + __udivdi3, + __umoddi3, +}); + // NOTE: if you are adding a new intrinsic here, you should also add it to // `redirect-intrinsics` in `rust/Makefile`.
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2.55.0