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,
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Cc: Link Mauve <linkmauve@linkmauve•fr>
Subject: [PATCH V16 5/7] rust: Make __udivdi3() and __umoddi3() panic
Date: Wed, 20 May 2026 12:16:27 +0530 [thread overview]
Message-ID: <20260520064630.1785283-6-mkchauras@gmail.com> (raw)
In-Reply-To: <20260520064630.1785283-1-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 6d7ed7a1ff18..8ce4fa0e5e57 100644
--- a/rust/Makefile
+++ b/rust/Makefile
@@ -618,6 +618,10 @@ 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`.
--
2.54.0
next prev parent reply other threads:[~2026-05-20 6:47 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-20 6:46 [PATCH V16 0/7] Rust Support for powerpc Mukesh Kumar Chaurasiya (IBM)
2026-05-20 6:46 ` [PATCH V16 1/7] rust: Fix "multiple candidates for rmeta dependency core" error Mukesh Kumar Chaurasiya (IBM)
2026-05-20 6:46 ` [PATCH V16 2/7] dma-resv: Fix undefined symbol when CONFIG_DMA_SHARED_BUFFER is disabled Mukesh Kumar Chaurasiya (IBM)
2026-05-20 6:46 ` [PATCH V16 3/7] powerpc/jump_label: adjust inline asm to be consistent Mukesh Kumar Chaurasiya (IBM)
2026-05-20 6:46 ` [PATCH V16 4/7] rust/powerpc: Set min rustc version for powerpc Mukesh Kumar Chaurasiya (IBM)
2026-05-25 18:16 ` Miguel Ojeda
2026-05-26 8:52 ` Mukesh Kumar Chaurasiya
2026-05-26 12:21 ` Miguel Ojeda
2026-05-27 11:15 ` Gary Guo
2026-06-02 7:15 ` Mukesh Kumar Chaurasiya
2026-05-20 6:46 ` Mukesh Kumar Chaurasiya (IBM) [this message]
2026-05-20 6:46 ` [PATCH V16 6/7] rust: Add PowerPC support Mukesh Kumar Chaurasiya (IBM)
2026-05-20 6:46 ` [PATCH V16 7/7] powerpc: Enable Rust for ppc64le Mukesh Kumar Chaurasiya (IBM)
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