[PATCH] x86/percpu: Disable named address spaces for KCSAN

[Uros Bizjak]

-fsanitize=thread (KCSAN) is at the moment incompatible
with named address spaces in a similar way as KASAN -
see GCC PR sanitizer/111736:

  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111736

The patch disables named address spaces with KCSAN.

Reported-by: kernel test robot <oliver.sang@xxxxxxxxx>
Signed-off-by: Uros Bizjak <ubizjak@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Brian Gerst <brgerst@xxxxxxxxx>
Cc: Denys Vlasenko <dvlasenk@xxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>

Closes: https://lore.kernel.org/oe-lkp/202403251658.8e92a8bc-lkp@xxxxxxxxx
---
 arch/x86/Kconfig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 39886bab943a..4fff6ed46e90 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2439,6 +2439,8 @@ config USE_X86_SEG_SUPPORT
 	# with named address spaces - see GCC PR sanitizer/111736.
 	#
 	depends on !KASAN
+	# -fsanitize=thread (KCSAN) is also incompatible.
+	depends on !KCSAN
 
 config CC_HAS_SLS
 	def_bool $(cc-option,-mharden-sls=all)
-- 
2.44.0