[PATCH v3 5/5] powerpc: kcsan: Add KCSAN Support

[Rohan McLure]

Enable HAVE_ARCH_KCSAN on all powerpc platforms, permitting use of the
kernel concurrency sanitiser through the CONFIG_KCSAN_* kconfig options.
KCSAN requires compiler builtins __atomic_* 64-bit values, and so only
report support on PPC64.

See documentation in Documentation/dev-tools/kcsan.rst for more
information.

Signed-off-by: Rohan McLure <rmclure at linux.ibm.com>
---
v3: Restrict support to 64-bit, as TSAN expects 64-bit __atomic_* compiler
built-ins.
---
 arch/powerpc/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index b8c4ac56bddc..55bc2d724c73 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -198,6 +198,7 @@ config PPC
 	select HAVE_ARCH_KASAN			if PPC_RADIX_MMU
 	select HAVE_ARCH_KASAN			if PPC_BOOK3E_64
 	select HAVE_ARCH_KASAN_VMALLOC		if HAVE_ARCH_KASAN
+	select HAVE_ARCH_KCSAN            if PPC64
 	select HAVE_ARCH_KFENCE			if ARCH_SUPPORTS_DEBUG_PAGEALLOC
 	select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
 	select HAVE_ARCH_KGDB
-- 
2.37.2