linux-kernel - [PATCH] rust: bindgen: disable GCC latent entropy plugin

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Message-ID: <20251221081659.1742800-1-stijn@linux-ipv6.be>
Date: Sun, 21 Dec 2025 10:16:59 +0200
From: stijn@...ux-ipv6.be
To: ojeda@...nel.org
Cc: rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] rust: bindgen: disable GCC latent entropy plugin

When CONFIG_GCC_PLUGIN_LATENT_ENTROPY and CONFIG_RUST are enabled, rust
bindgen fails due to latent_entropy being undeclared:

  BINDGEN rust/bindings/bindings_generated.rs
./include/linux/random.h:24:39: error: use of undeclared identifier 'latent_entropy'
./include/linux/random.h:24:62: error: use of undeclared identifier 'latent_entropy'
Unable to generate bindings: clang diagnosed error: ./include/linux/random.h:24:39: error: use of undeclared identifier 'latent_entropy'
./include/linux/random.h:24:62: error: use of undeclared identifier 'latent_entropy'

Fix this by adding DISABLE_LATENT_ENTROPY_PLUGIN to
bindgen_extra_c_flags.

Fixes: 2f7ab1267dc9 ("Kbuild: add Rust support")
Signed-off-by: Stijn Tintel <stijn@...ux-ipv6.be>
---
 rust/Makefile | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/rust/Makefile b/rust/Makefile
index 5d357dce1704d..633dec548f6e0 100644
--- a/rust/Makefile
+++ b/rust/Makefile
@@ -412,6 +412,10 @@ bindgen_extra_c_flags += -enable-trivial-auto-var-init-zero-knowing-it-will-be-r
 endif
 endif
 
+ifdef CONFIG_GCC_PLUGIN_LATENT_ENTROPY
+bindgen_extra_c_flags += $(DISABLE_LATENT_ENTROPY_PLUGIN)
+endif
+
 bindgen_c_flags = $(filter-out $(bindgen_skip_c_flags), $(c_flags)) \
 	$(bindgen_extra_c_flags)
 endif
-- 
2.51.2