linux-kernel - [PATCH] lib/crypto: blake2b: Limit frame size workaround to GCC

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Message-ID: <20251122105530.441350-2-thorsten.blum@linux.dev>
Date: Sat, 22 Nov 2025 11:55:31 +0100
From: Thorsten Blum <thorsten.blum@...ux.dev>
To: Eric Biggers <ebiggers@...nel.org>,
	"Jason A. Donenfeld" <Jason@...c4.com>,
	Ard Biesheuvel <ardb@...nel.org>
Cc: Thorsten Blum <thorsten.blum@...ux.dev>,
	linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] lib/crypto: blake2b: Limit frame size workaround to GCC < 12.2 on i386

The GCC bug only occurred on i386 and has been resolved since GCC 12.2.
Limit the frame size workaround to GCC < 12.2 on i386.

Signed-off-by: Thorsten Blum <thorsten.blum@...ux.dev>
---
 lib/crypto/Makefile | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/crypto/Makefile b/lib/crypto/Makefile
index b5346cebbb55..5ee36a231484 100644
--- a/lib/crypto/Makefile
+++ b/lib/crypto/Makefile
@@ -33,7 +33,11 @@ obj-$(CONFIG_CRYPTO_LIB_GF128MUL)		+= gf128mul.o
 
 obj-$(CONFIG_CRYPTO_LIB_BLAKE2B) += libblake2b.o
 libblake2b-y := blake2b.o
+ifeq ($(CONFIG_X86_32),y)
+ifeq ($(CONFIG_CC_IS_GCC)_$(call gcc-min-version, 120200),y_)
 CFLAGS_blake2b.o := -Wframe-larger-than=4096 #  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105930
+endif # CONFIG_CC_IS_GCC
+endif # CONFIG_X86_32
 ifeq ($(CONFIG_CRYPTO_LIB_BLAKE2B_ARCH),y)
 CFLAGS_blake2b.o += -I$(src)/$(SRCARCH)
 libblake2b-$(CONFIG_ARM) += arm/blake2b-neon-core.o
-- 
2.51.1