From: "Mukesh Kumar Chaurasiya (IBM)" <mkchauras@gmail•com>
To: maddy@linux•ibm.com, mpe@ellerman•id.au, npiggin@gmail•com,
chleroy@kernel•org, peterz@infradead•org, jpoimboe@kernel•org,
jbaron@akamai•com, aliceryhl@google•com, rostedt@goodmis•org,
ardb@kernel•org, sumit.semwal@linaro•org,
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rust-for-linux@vger•kernel.org, llvm@lists•linux.dev
Cc: Link Mauve <linkmauve@linkmauve•fr>
Subject: [PATCH V13 5/7] rust: Make __udivdi3() and __umoddi3() panic
Date: Fri, 24 Apr 2026 11:17:40 +0530 [thread overview]
Message-ID: <20260424054742.45832-6-mkchauras@gmail.com> (raw)
In-Reply-To: <20260424054742.45832-1-mkchauras@gmail.com>
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.
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`.
--
2.53.0
next prev parent reply other threads:[~2026-04-24 5:48 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-24 5:47 [PATCH V13 0/7] Rust support for powerpc Mukesh Kumar Chaurasiya (IBM)
2026-04-24 5:47 ` [PATCH V13 1/7] rust: Fix "multiple candidates for rmeta dependency core" error Mukesh Kumar Chaurasiya (IBM)
2026-04-24 5:47 ` [PATCH V13 2/7] dma-resv: Fix undefined symbol when CONFIG_DMA_SHARED_BUFFER is disabled Mukesh Kumar Chaurasiya (IBM)
2026-04-24 7:56 ` Christian König
2026-04-24 8:06 ` Mukesh Kumar Chaurasiya
2026-04-24 8:25 ` Christian König
2026-04-24 8:34 ` Mukesh Kumar Chaurasiya
2026-04-24 8:44 ` Christian König
2026-04-24 5:47 ` [PATCH V13 3/7] powerpc/jump_label: adjust inline asm to be consistent Mukesh Kumar Chaurasiya (IBM)
2026-04-24 5:47 ` [PATCH V13 4/7] rust/powerpc: Set min rustc version for powerpc Mukesh Kumar Chaurasiya (IBM)
2026-04-24 5:47 ` Mukesh Kumar Chaurasiya (IBM) [this message]
2026-04-24 8:59 ` [PATCH V13 5/7] rust: Make __udivdi3() and __umoddi3() panic Arnd Bergmann
2026-04-24 9:14 ` David Laight
2026-04-24 9:43 ` Link Mauve
2026-04-24 10:20 ` Arnd Bergmann
2026-04-24 10:34 ` Miguel Ojeda
2026-04-24 10:26 ` Miguel Ojeda
2026-04-24 11:09 ` David Laight
2026-04-27 16:05 ` [Linaro-mm-sig] " Arnd Bergmann
2026-04-24 11:54 ` Segher Boessenkool
2026-04-24 11:57 ` Segher Boessenkool
2026-04-24 12:53 ` Segher Boessenkool
2026-04-24 12:43 ` Gary Guo
2026-04-26 7:52 ` Mukesh Kumar Chaurasiya
2026-04-26 14:20 ` Gary Guo
2026-04-26 22:04 ` David Laight
2026-04-27 13:04 ` Gary Guo
2026-04-24 5:47 ` [PATCH V13 6/7] rust: Add PowerPC support Mukesh Kumar Chaurasiya (IBM)
2026-04-24 5:47 ` [PATCH V13 7/7] powerpc: Enable Rust for ppc64le Mukesh Kumar Chaurasiya (IBM)
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