From: Miguel Ojeda <ojeda@kernel.org>
To: Miguel Ojeda <ojeda@kernel.org>,
Alex Gaynor <alex.gaynor@gmail.com>,
Nathan Chancellor <nathan@kernel.org>,
Nicolas Schier <nicolas@fjasle.eu>,
Huacai Chen <chenhuacai@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org
Cc: "Boqun Feng" <boqun.feng@gmail.com>,
"Gary Guo" <gary@garyguo.net>,
"Björn Roy Baron" <bjorn3_gh@protonmail.com>,
"Benno Lossin" <lossin@kernel.org>,
"Andreas Hindborg" <a.hindborg@kernel.org>,
"Alice Ryhl" <aliceryhl@google.com>,
"Trevor Gross" <tmgross@umich.edu>,
"Danilo Krummrich" <dakr@kernel.org>,
rust-for-linux@vger.kernel.org, linux-kbuild@vger.kernel.org,
"WANG Xuerui" <kernel@xen0n.name>,
loongarch@lists.linux.dev, "H. Peter Anvin" <hpa@zytor.com>,
linux-kernel@vger.kernel.org, patches@lists.linux.dev
Subject: [PATCH] rust: kbuild: support `-Cjump-tables=n` for Rust 1.93.0
Date: Sat, 1 Nov 2025 10:40:11 +0100 [thread overview]
Message-ID: <20251101094011.1024534-1-ojeda@kernel.org> (raw)
Rust 1.93.0 (expected 2026-01-22) is stabilizing `-Zno-jump-tables`
[1][2] as `-Cjump-tables=n` [3].
Without this change, one would eventually see:
RUSTC L rust/core.o
error: unknown unstable option: `no-jump-tables`
Thus support the upcoming version.
Link: https://github.com/rust-lang/rust/issues/116592 [1]
Link: https://github.com/rust-lang/rust/pull/105812 [2]
Link: https://github.com/rust-lang/rust/pull/145974 [3]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
---
arch/loongarch/Makefile | 2 +-
arch/x86/Makefile | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/loongarch/Makefile b/arch/loongarch/Makefile
index dc5bd3f1b8d2..96ca1a688984 100644
--- a/arch/loongarch/Makefile
+++ b/arch/loongarch/Makefile
@@ -109,7 +109,7 @@ endif
ifdef CONFIG_RUSTC_HAS_ANNOTATE_TABLEJUMP
KBUILD_RUSTFLAGS += -Cllvm-args=--loongarch-annotate-tablejump
else
-KBUILD_RUSTFLAGS += -Zno-jump-tables # keep compatibility with older compilers
+KBUILD_RUSTFLAGS += $(if $(call rustc-min-version,109300),-Cjump-tables=n,-Zno-jump-tables) # keep compatibility with older compilers
endif
ifdef CONFIG_LTO_CLANG
# The annotate-tablejump option can not be passed to LLVM backend when LTO is enabled.
diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 4db7e4bf69f5..c60371db49d9 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -98,7 +98,7 @@ ifeq ($(CONFIG_X86_KERNEL_IBT),y)
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104816
#
KBUILD_CFLAGS += $(call cc-option,-fcf-protection=branch -fno-jump-tables)
-KBUILD_RUSTFLAGS += -Zcf-protection=branch -Zno-jump-tables
+KBUILD_RUSTFLAGS += -Zcf-protection=branch $(if $(call rustc-min-version,109300),-Cjump-tables=n,-Zno-jump-tables)
else
KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
endif
base-commit: dcb6fa37fd7bc9c3d2b066329b0d27dedf8becaa
--
2.51.2
next reply other threads:[~2025-11-01 9:40 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-01 9:40 Miguel Ojeda [this message]
2025-11-01 11:15 ` [PATCH] rust: kbuild: support `-Cjump-tables=n` for Rust 1.93.0 Alice Ryhl
2025-11-01 15:53 ` Miguel Ojeda
2025-11-01 17:25 ` Nicolas Schier
2025-11-02 7:57 ` Trevor Gross
2025-11-04 19:25 ` Miguel Ojeda
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