linux-kernel - [PATCH v2] x86/Kconfig: Fix allyesconfig

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Message-ID: <20250416230559.2017012-1-linux@roeck-us.net>
Date: Wed, 16 Apr 2025 16:05:59 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Andrey Ryabinin <ryabinin.a.a@...il.com>
Cc: Alexander Potapenko <glider@...gle.com>,
	Andrey Konovalov <andreyknvl@...il.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Vincenzo Frascino <vincenzo.frascino@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	kasan-dev@...glegroups.com,
	linux-kernel@...r.kernel.org,
	Guenter Roeck <linux@...ck-us.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH v2] x86/Kconfig: Fix allyesconfig

64-bit allyesconfig builds fail with

x86_64-linux-ld: kernel image bigger than KERNEL_IMAGE_SIZE

Bisect points to commit 6f110a5e4f99 ("Disable SLUB_TINY for build
testing") as the responsible commit. Reverting that patch does indeed
fix the problem. Further analysis shows that disabling SLUB_TINY enables
KASAN, and that KASAN is responsible for the image size increase.

Solve the build problem by disabling KASAN for test builds.

Fixes: 6f110a5e4f99 ("Disable SLUB_TINY for build testing")
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
v2: Disable KASAN unconditionally for test builds

 lib/Kconfig.kasan | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
index f82889a830fa..190297f2ff83 100644
--- a/lib/Kconfig.kasan
+++ b/lib/Kconfig.kasan
@@ -37,7 +37,7 @@ menuconfig KASAN
 		     (HAVE_ARCH_KASAN_SW_TAGS && CC_HAS_KASAN_SW_TAGS)) && \
 		    CC_HAS_WORKING_NOSANITIZE_ADDRESS) || \
 		   HAVE_ARCH_KASAN_HW_TAGS
-	depends on SYSFS && !SLUB_TINY
+	depends on SYSFS && !SLUB_TINY && !COMPILE_TEST
 	select STACKDEPOT_ALWAYS_INIT
 	help
 	  Enables KASAN (Kernel Address Sanitizer) - a dynamic memory safety
-- 
2.45.2