From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9C4E42F6596; Sun, 1 Mar 2026 01:55:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772330104; cv=none; b=VcpMZ2FKB6iUkVbr1guXkOmT8NdX9T+jBd3aUBbP7cUXq4FVvJpb0ZuM7HQKTqNkFv5ROs+2bCR58x2RFoYUke8eV5hoEhhD46tRbSLzrcfgRJ9RgtkfUb2XmwAkvs8ceaAXn3H9oXg5uLtg69PKFlKOqLhu1U8zhTEfPbUgNS4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772330104; c=relaxed/simple; bh=4LkAhYQkxRnyaUYBdBY8Jf7ufPw2u8PPFxuJBUsRjZ8=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=cziUG1FuU5hDkjsxw7A0SN/OkKdPUSoNphgXEBygwJmdpO3HthjLVx4knSPrMAHSthoNZebK7q7B0UvM7BBI3If1WO4U2FIlUN99tOFdzOUG2SELouwdGWCQ34hGAVKfj1UK+O524ANNuul7nIJuq2fjHSruuSB2T0PIw/r/oXc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=UN5v+89d; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="UN5v+89d" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D5D3AC19421; Sun, 1 Mar 2026 01:55:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772330104; bh=4LkAhYQkxRnyaUYBdBY8Jf7ufPw2u8PPFxuJBUsRjZ8=; h=From:To:Cc:Subject:Date:From; b=UN5v+89dV1mCnIiZNlDLmtqAS2d1WSBKUSaLnoHlD9VzkOdwPwcFGVkFfeWB4p9GQ EwJPsPiacRwobq2sEIKLB0nproOA4FukS2UiaGwfMeXl8073RR/AEqtycokEz1iRkw 1Cr9DD0dyY7wwQGEUKbuM/QAAadAMhko/5Bgpwbqtvd6CBUtSY8jfWYGVcxWwuPnrJ SdF6WyhVUhLqt/OvaYpob6xMRtqvIDOtq/I/FjRYcpIgdfmQCBQZ+J1sb3bdECs93Y 6lpPJ9strYh8nTKrSX1czEpwAz5MA34kqszPsBycNuqMIGgV0nqOR7gjYf3iI+C22D Zb/sBUWnl9mFg== From: Sasha Levin To: stable@vger.kernel.org, ojeda@kernel.org Cc: David Wood , Wesley Wiser , Gary Guo , rust-for-linux@vger.kernel.org Subject: FAILED: Patch "rust: kbuild: pass `-Zunstable-options` for Rust 1.95.0" failed to apply to 5.15-stable tree Date: Sat, 28 Feb 2026 20:55:02 -0500 Message-ID: <20260301015502.1722156-1-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Hint: ignore X-stable: review Content-Transfer-Encoding: 8bit The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . Thanks, Sasha ------------------ original commit in Linus's tree ------------------ >From 0a9be83e57de0d0ca8ca4ec610bc344f17a8e5e7 Mon Sep 17 00:00:00 2001 From: Miguel Ojeda Date: Fri, 6 Feb 2026 21:45:35 +0100 Subject: [PATCH] rust: kbuild: pass `-Zunstable-options` for Rust 1.95.0 Custom target specifications are unstable, but starting with Rust 1.95.0, `rustc` requires to explicitly pass `-Zunstable-options` to use them [1]: error: error loading target specification: custom targets are unstable and require `-Zunstable-options` | = help: run `rustc --print target-list` for a list of built-in targets David (Rust compiler team lead), writes: "We're destabilising custom targets to allow us to move forward with build-std without accidentally exposing functionality that we'd like to revisit prior to committing to. I'll start a thread on Zulip to discuss with the RfL team how we can come up with an alternative for them." Thus pass it. Cc: David Wood Cc: Wesley Wiser Cc: stable@vger.kernel.org # Needed in 6.12.y and later (Rust is pinned in older LTSs). Link: https://github.com/rust-lang/rust/pull/151534 [1] Reviewed-by: Gary Guo Tested-by: Gary Guo Link: https://patch.msgid.link/20260206204535.39431-1-ojeda@kernel.org Signed-off-by: Miguel Ojeda --- rust/Makefile | 3 +++ 1 file changed, 3 insertions(+) diff --git a/rust/Makefile b/rust/Makefile index 4dcc2eff51cb2..725158740fc6f 100644 --- a/rust/Makefile +++ b/rust/Makefile @@ -552,6 +552,8 @@ $(obj)/$(libpin_init_internal_name): private rustc_target_flags = --cfg kernel $(obj)/$(libpin_init_internal_name): $(src)/pin-init/internal/src/lib.rs FORCE +$(call if_changed_dep,rustc_procmacro) +# `rustc` requires `-Zunstable-options` to use custom target specifications +# since Rust 1.95.0 (https://github.com/rust-lang/rust/pull/151534). quiet_cmd_rustc_library = $(if $(skip_clippy),RUSTC,$(RUSTC_OR_CLIPPY_QUIET)) L $@ cmd_rustc_library = \ OBJTREE=$(abspath $(objtree)) \ @@ -562,6 +564,7 @@ quiet_cmd_rustc_library = $(if $(skip_clippy),RUSTC,$(RUSTC_OR_CLIPPY_QUIET)) L --crate-type rlib -L$(objtree)/$(obj) \ --crate-name $(patsubst %.o,%,$(notdir $@)) $< \ --sysroot=/dev/null \ + -Zunstable-options \ $(if $(rustc_objcopy),;$(OBJCOPY) $(rustc_objcopy) $@) \ $(cmd_objtool) -- 2.51.0