linux-kernel - [PATCH v9 1/6] kasan: allow an architecture to disable inline instrumentation

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Date:   Wed,  2 Dec 2020 03:16:27 +1100
From:   Daniel Axtens <dja@...ens.net>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linuxppc-dev@...ts.ozlabs.org, kasan-dev@...glegroups.com,
        christophe.leroy@....fr, aneesh.kumar@...ux.ibm.com,
        bsingharora@...il.com
Cc:     Daniel Axtens <dja@...ens.net>
Subject: [PATCH v9 1/6] kasan: allow an architecture to disable inline instrumentation

For annoying architectural reasons, it's very difficult to support inline
instrumentation on powerpc64.

Add a Kconfig flag to allow an arch to disable inline. (It's a bit
annoying to be 'backwards', but I'm not aware of any way to have
an arch force a symbol to be 'n', rather than 'y'.)

Signed-off-by: Daniel Axtens <dja@...ens.net>
---
 lib/Kconfig.kasan | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
index 542a9c18398e..31a0b28f6c2b 100644
--- a/lib/Kconfig.kasan
+++ b/lib/Kconfig.kasan
@@ -9,6 +9,9 @@ config HAVE_ARCH_KASAN_SW_TAGS
 config	HAVE_ARCH_KASAN_VMALLOC
 	bool
 
+config HAVE_ARCH_NO_KASAN_INLINE
+	def_bool n
+
 config CC_HAS_KASAN_GENERIC
 	def_bool $(cc-option, -fsanitize=kernel-address)
 
@@ -108,6 +111,7 @@ config KASAN_OUTLINE
 
 config KASAN_INLINE
 	bool "Inline instrumentation"
+	depends on !HAVE_ARCH_NO_KASAN_INLINE
 	help
 	  Compiler directly inserts code checking shadow memory before
 	  memory accesses. This is faster than outline (in some workloads
-- 
2.25.1