linux-kernel - [PATCH v5 1/2] kbuild: add rustc-max-version macro

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Message-ID: <20260205131815.2943152-1-mlksvender@gmail.com>
Date: Thu,  5 Feb 2026 22:18:14 +0900
From: HeeSu Kim <mlksvender@...il.com>
To: nathan@...nel.org
Cc: a.hindborg@...nel.org,
	aliceryhl@...gle.com,
	bjorn3_gh@...tonmail.com,
	boqun@...gle.com,
	charmitro@...teo.net,
	dakr@...nel.org,
	gary@...yguo.net,
	linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	lossin@...nel.org,
	miguel.ojeda.sandonis@...il.com,
	nsc@...nel.org,
	ojeda@...nel.org,
	rust-for-linux@...r.kernel.org,
	stable@...r.kernel.org,
	tmgross@...ch.edu,
	HeeSu Kim <mlksvender@...il.com>
Subject: [PATCH v5 1/2] kbuild: add rustc-max-version macro

Add `rustc-max-version` macro to `scripts/Makefile.compiler` for
version upper bound checks, mirroring the existing `rustc-min-version`.

This will be used to bound workarounds to specific compiler version
ranges.

Suggested-by: Miguel Ojeda <ojeda@...nel.org>
Link: https://lore.kernel.org/rust-for-linux/CANiq72n39eU9WE=Yh0_yJzmqMxo=QAaU2pN0UqP9jZ7bT7rhgA@mail.gmail.com/
Acked-by: Nathan Chancellor <nathan@...nel.org>
Signed-off-by: HeeSu Kim <mlksvender@...il.com>
---
Changes in v5:
- Split rustc-max-version macro into separate patch for easier backporting
  (was part of the workaround patch in v4)

 scripts/Makefile.compiler | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/scripts/Makefile.compiler b/scripts/Makefile.compiler
index ef91910de265..85268f6f1494 100644
--- a/scripts/Makefile.compiler
+++ b/scripts/Makefile.compiler
@@ -71,6 +71,10 @@ clang-min-version = $(call test-ge, $(CONFIG_CLANG_VERSION), $1)
 # Usage: rustc-$(call rustc-min-version, 108500) += -Cfoo
 rustc-min-version = $(call test-ge, $(CONFIG_RUSTC_VERSION), $1)
 
+# rustc-max-version
+# Usage: rustc-$(call rustc-max-version, 109000) += -Cfoo
+rustc-max-version = $(call test-le, $(CONFIG_RUSTC_VERSION), $1)
+
 # ld-option
 # Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y)
 ld-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3))
-- 
2.52.0