On Fri, 24 Apr 2026 11:17:40 +0530 "Mukesh Kumar Chaurasiya (IBM)" mkchauras@gmail.com wrote:
From: Link Mauve linkmauve@linkmauve.fr
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.
Ugg. Surely you can make it a link-time failure? Or change the underlying code to avoid the divide.
David
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 linkmauve@linkmauve.fr Signed-off-by: Mukesh Kumar Chaurasiya (IBM) mkchauras@gmail.com
rust/Makefile | 4 ++++ rust/compiler_builtins.rs | 6 ++++++ 2 files changed, 10 insertions(+)
diff --git a/rust/Makefile b/rust/Makefile index 2a5428a5503d..ee11fba7a03d 100644 --- a/rust/Makefile +++ b/rust/Makefile @@ -616,6 +616,10 @@ 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`.